If your company is about to manufacture, import, sell or license a product in Montenegro, two separate questions land on you, and both are answered from the same register. Is someone else's patent in force here, so that your launch is an infringement? And is your own European patent actually in force here, or did it lapse because nobody filed a three-month request in Podgorica? Unauthorised use of a patented invention is a misdemeanour carrying a fine of €1,500 to €20,000 for a legal person, €500 to €2,000 for the responsible person inside it, and confiscation and destruction of the goods (Law on Patents Article 160). The duty to look is the company's. The office will not warn you.
Sources, checked 18 September 2026: Zakon o patentima (Law on Patents, "Sl. list CG" 042/15, 002/17, 146/21, 003/23, 084/24, 028/25), in the consolidated text published through the Government's document service (Katalog propisa 2025, 48 pages). The most recent amending act, 028/25 of 19 March 2025, was additionally read in the Official Gazette's own typeset pages; it entered into force on the eighth day after publication, that is 27 March 2025 (Article 6 of that act). Other sources: the Directorate's online patent register at patentniregistar.gov.me, queried directly on 18 September 2026; and the EPO's own tables of member states and extension states. This is general information, not advice on your matter.
The patent register is not where the trademark register is
Montenegro's industrial property rights are administered by the Directorate for Intellectual Property (Direkcija za intelektualnu svojinu) of the Ministry of Economic Development. But the searchable databases sit on two different systems, and neither one tells you that the other exists.
- Trademarks and industrial designs are on the Ministry's general register platform at
registri-is.gov.me. - Patents are on a separate application at `patentniregistar.gov.me`, reached through its online search page. The trademark platform links out to it rather than hosting it.
A search of the trademark platform will therefore return nothing about patents, and it will do so without any error message. That is the first and most common false negative. For the trademark side, see our guide to the Montenegro trademark search.
What the patent search actually lets you do
We queried the register's own search interface on 18 September 2026. Unlike the trademark register, which offers no class search, the patent search is built around classification and international numbering.
| Search field | What it does | Practical note |
|---|---|---|
| Application/patent number | Matches the national file number | National files run in the form `P-<year>-<serial>` |
| Publication number | Matches a granted national patent number or a European publication number | Covers both national and European-origin records |
| IPC class (MKP) | Searches the International Patent Classification | The technology-based search the trademark register lacks |
| PCT application number | Matches the international application | Useful where the family entered via the PCT |
| Applicant / inventor name | Name search across holders and inventors | Runs the term in both Latin and Cyrillic script |
| Priority number, date, country | Filters on the claimed priority | Lets you rebuild a family's coverage |
| Filing date range | Filters on the filing date | The field behind the blind spot described below |
The name search transliterating into both scripts matters more than it sounds. A foreign company's name may be recorded either way, and a single-script search of the underlying data would miss half the file.
The two things the search cannot show you
First: nothing filed in the last eighteen months. Under Article 44(1), a patent application is published in the official gazette as soon as possible after the expiry of 18 months from the filing date or the claimed priority date. Publication can be brought forward on the applicant's request, but not before three months from filing (Article 44(2)). Until publication, the application is not in the public file. A clean search result in 2026 is therefore consistent with an application filed in 2025 that will surface later and will be enforceable from its filing date.
Second: the register thins out sharply after October 2022, and that is a change of route, not a change of risk. Counting records by filing date on 18 September 2026, the register held 3,980 files under national numbers. Of those, 3,256 — about 82% — carry European patent application data, and 3,967 carry a grant record. Broken down by filing period:
| Filing period | Records | Of which European-origin |
|---|---|---|
| 2010-01-01 to 2014-12-31 | 1,433 | 1,391 |
| 2015-01-01 to 2019-12-31 | 1,070 | 1,026 |
| 2020-01-01 to 2022-09-30 | 132 | 119 |
| 2022-10-01 onwards | 35 | 17 |
The four periods cover filings from 2010 onwards and account for 2,670 of the 3,980 records; the remaining 1,310 carry filing dates before 2010.
Read naively, that table says patenting in Montenegro collapsed. It says something narrower. The register is, and always was, overwhelmingly a register of European rights reaching Montenegro rather than of home-grown national filings. The date on which the series falls away — 1 October 2022 — is the date Montenegro's legal route for European patents changed, and it is the subject of the next section. What a company should take from the table is operational: a filing-date search of this database will not tell you what European rights cover Montenegro today. You have to check the European register as well.
Which European route applies depends on one date
Montenegro moved from being an extension state to being a full contracting state of the European Patent Convention, and the boundary is the filing date of the European application, not today's date.
| European application filed | How Montenegro is covered | Where in the Law on Patents |
|---|---|---|
| 1 March 2010 – 30 September 2022 | Extension to Montenegro on request, with an extension fee | Articles 141–150; Article 153 for PCT cases |
| On or after 1 October 2022 | Montenegro is a designated contracting state automatically; no extension fee | Articles 150a–150p; Article 153a for PCT cases |
The dates come from the EPO's own records: the extension agreement between the Government of Montenegro and the European Patent Organisation was signed on 13 February 2009, entered into force on 1 March 2010 and terminated on 30 September 2022; Montenegro appears in the EPO's table of member states by date of accession with effect from 1 October 2022. Montenegro is one of 40 member states listed there on the check date. The Law on Patents carries the same boundary in its own words: Article 153 treats an international application filed on or after 1 March 2010 but before the Convention entered into force in Montenegro, and designating Montenegro, as a request for extension.
A European patent granted today from an application filed in, say, 2021 therefore reaches Montenegro only if the extension was requested and the extension fee paid back then. Nothing done in 2026 can repair that. It is the point on which the phrase "European patent" misleads a company most easily, because the wording of the patent itself does not change with the filing date.
The three-month clock that voids a European patent in Montenegro
Even where Montenegro is properly covered, the right does not look after itself. Article 150e, which the 2025 amendment replaced in full, sets out what the holder must do, and what happens if it is not done.
- The European patent, from the date the EPO publishes the mention of grant in the European Patent Bulletin, gives the same rights as a national patent — but only under the conditions in paragraphs 2 to 8 (Article 150e(1)).
- The holder must file a request to enter the European patent in the Register of Patents within three months of that publication (Article 150e(2)).
- With the request go the patent specification in English, or a translation of it into English if the language of the proceedings was not English, and a translation of the claims into Montenegrin (Article 150e(3)).
- The holder pays the prescribed charge for publishing and printing the translation of the claims (Article 150e(4)).
- If the patent survives opposition or limitation at the EPO with amended claims, a further three-month clock runs from publication of that decision for the amended Montenegrin claims and the charge (Article 150e(5)).
- The sanction: if the translation under paragraphs 3 and 5 is not filed in time, or the charge under paragraphs 4 and 5 is not paid in time, the European patent is deemed void from the beginning as regards Montenegro (Article 150e(8)).
Paragraph 3 is the part to check against your own records. In the article as replaced in 2025, the request must be accompanied by the specification in English as well as the Montenegrin claims, and paragraph 8 attaches the voidness sanction to the paragraph 3 translation. A validation handled after 27 March 2025 that produced only a request, Montenegrin claims and the fee is therefore exposed to that argument. If that describes a patent in your portfolio, the file is worth pulling now rather than at the point someone challenges it.
A Montenegrin national patent is a ten-year right until you prove it
The other half of a search is understanding what the records you find are actually worth. Montenegro grants national patents without substantive examination.
- The office issues the decision granting the patent and enters it in the Register of Patents (Article 45(1)), and the date of publication of the application is deemed the date of grant (Article 45(2)).
- The holder must then, no later than the expiry of the ninth year of the patent's validity, file written proof that the invention meets the conditions of Articles 5 to 8, 10 and 11 — novelty, inventive step, industrial applicability (Article 46(1)).
- Acceptable proof is a certified Montenegrin translation of the specification of a patent granted for the same invention by a state or intergovernmental office that carried out substantive examination (Article 47(1)). If that procedure is still running, the deadline can be extended by up to three months after it ends (Article 47(2)).
- If the proof is not filed, the patent ceases to exist on the day the tenth year expires (Articles 46(4) and 47(3)). The same result follows if the prescribed fee is not paid (Article 46(2)–(3)).
The 2025 amendment added a route for holders with no foreign counterpart. Under the new Article 20(3)–(5), the office may conclude cooperation agreements with national or intergovernmental patent offices for search reports with a written opinion on whether the invention meets those same conditions; the applicant files an English translation and bears the costs. Where such a report comes from the European Patent Office, it goes into the file but does not affect the grant decision under Article 45. The new Article 47(5) then allows a report obtained that way to serve as the proof of patentability required by Article 46(1).
So the practical reading of a national Montenegrin patent is: full term is 20 years from the filing date (Article 80), with maintenance fees due for the third and each subsequent year (Article 81), but it is in substance a ten-year right unless the holder feeds it an examined counterpart in time. When you find a national patent blocking your product, check its age. When you own one, diarise year nine.
Filing or acting for a foreign company
A foreign legal or natural person with no seat, permanent residence or temporary stay in Montenegro must be represented before the office by a representative entered in the Register of Representatives or by an advokat on the roll of the Bar Association of Montenegro (Article 4(1)). There are narrow exceptions where the foreign party may act alone: filing the application and the steps establishing its filing date, filing copies of a first application when claiming priority, paying fees, and receiving notices about those steps (Article 4(2)). Even then, an address for service inside Montenegro must be given (Article 4(3)).
Representatives are individuals who know a world language and work as representatives professionally, and who hold a law or technical degree together with either a special professional examination before the office or at least five years' patent experience inside it; legal persons qualify by employing or contracting such a person (Article 155).
What a search does not settle
A register search establishes what is recorded. It does not establish freedom to operate. Three limits are worth stating plainly.
- The 18-month rule means recent filings are invisible, so a clean result has a moving cut-off, not an absolute one.
- Records that show a European origin still require the European file to be read; the national entry does not restate the claims as amended at the EPO.
- Patent scope is a question about claim construction, not about whether a title looks similar. Two products in the same IPC class may not conflict at all, and two in different classes may.
We also note one thing we could not close on the check date. The register's data does not, by itself, distinguish a European patent entered under Article 150e from an extension-era file, and the online search is keyed to filing date rather than to the date of entry in the Register of Patents. The counts above should be read as filing-date counts, which is what we measured, and not as a count of rights in force.
Whose side we are on
We act for the company that wants to sell, manufacture or license. We take no commission from representatives or agents, and the databases named on this page are public services that we do not resell. What we provide is the reading: which records are live, which route a European patent took to Montenegro, and which deadline is about to decide whether it still bites.
Before your company launches or validates
If your company is about to put a product on the Montenegrin market, take a licence, or acquire a business whose value sits in a patent, send us the product, the technical field and any patent numbers you already have before you commit. If you hold a European patent where Montenegro is designated, send us the grant date and what was filed in Podgorica, and we will tell you in writing whether Article 150e has been satisfied and what is still open. For the company-law side of the same transaction, see our corporate law service and our guide to the Montenegrin company register; for software and technology matters, our IT law service; and if you are still setting up, our company formation service.
