To check the status of a patent, start with the U.S. Patent and Trademark Office’s Patent Center, which shows whether a U.S. application is pending, whether a patent has issued, and whether it is still in force. A complete answer to how to check patent status also means confirming who currently owns the patent, whether anyone has challenged it at the Patent Trial and Appeal Board, whether maintenance fees have kept it alive, and whether its real expiration date differs from a simple filing-date calculation. Each of those checks uses a separate free tool, and skipping any of them can leave you with the wrong picture.
What the Status Labels Actually Mean
Before you look anything up, it helps to know what you’ll see.
A pending application has been filed but not yet decided. The applicant has no enforceable patent yet, but once a patent issues, the owner can seek a reasonable royalty from anyone who used the published invention with actual notice of the application during the pending period.1Office of the Law Revision Counsel. 35 U.S. Code 154 – Contents and Term of Patent; Provisional Rights
An issued (or granted) patent gives the owner the exclusive right to stop others from making, using, selling, or importing the invention. Utility patents run 20 years from the filing date, subject to maintenance-fee payments.1Office of the Law Revision Counsel. 35 U.S. Code 154 – Contents and Term of Patent; Provisional Rights Design patents last 15 years from grant with no maintenance fees,2Office of the Law Revision Counsel. 35 U.S. Code 173 – Term of Design Patent and plant patents also have no maintenance fees.3Office of the Law Revision Counsel. 35 U.S. Code 41 – Patent Fees; Patent and Trademark Search Systems
An abandoned application is one the applicant stopped pursuing, usually by missing a deadline or a fee. The invention is generally unprotected, though revival is sometimes possible. An expired patent has either run its full term or lapsed for unpaid maintenance fees, and the invention enters the public domain.
What to Have Ready
A patent number (for granted patents) or an application number makes the lookup nearly instant. A USPTO application number is a two-digit series code followed by a six-digit serial number.4United States Patent and Trademark Office. Search for Application Without either number, you can still search by inventor name, assignee, filing or issue date, or keywords, though keyword searches return broader results that take more sorting.
Checking U.S. Patents and Applications in Patent Center
Patent Center is the USPTO’s primary tool for application and patent status. It replaced the older EFS-Web and Private PAIR systems in November 2023.5United States Patent and Trademark Office. EFS-Web and Private PAIR Retirement You can search by application number, patent number, or other identifiers, and pull up the file history for the application.6United States Patent and Trademark Office. Patent Center
Patent Center also shows Patent Term Adjustment (PTA) for issued patents, which tells you whether USPTO processing delays extended the patent’s term beyond the standard 20-year calculation.7United States Patent and Trademark Office. Explanation of Patent Term Adjustment Calculation
If you don’t have a number and need to identify a patent by its subject matter, use Patent Public Search instead. It lets you look up issued patents and published applications by keywords, inventor names, or publication numbers.8United States Patent and Trademark Office. Patent Public Search Once you have a number from that search, drop it into Patent Center for the status.
Confirming Who Currently Owns the Patent
The inventor named on the patent may not be the current owner. Patents change hands through recorded assignments, and the USPTO’s Assignment Search database covers everything recorded from August 1980 to the present. You can search by application number, assignee name, or assignor name.9United States Patent and Trademark Office. Patent Assignment Search
This step matters most if you’re negotiating a license or acquisition. An assignment that isn’t recorded at the USPTO can lose priority to a later buyer who had no knowledge of the earlier transfer.10United States Patent and Trademark Office. Handling of Documents in the Assignment Recordation Branch Gaps or oddities in the assignment chain are worth investigating before signing anything.
Checking for Active Challenges at the PTAB
A patent listed as “issued” in Patent Center can still have its claims under attack. Competitors can petition the Patent Trial and Appeal Board to invalidate a patent through Inter Partes Review or Post-Grant Review, and a successful challenge can cancel some or all of the claims.
Search the Patent Trial and Appeal Case Tracking System (P-TACTS) by patent number, application number, or party name to see whether a proceeding is pending or has been decided.11United States Patent and Trademark Office. Search P-TACTS – Patent Trial and Appeal Case Tracking System This is a common oversight in patent due diligence.
Checking International Counterparts
Patents are territorial, so a U.S. status check tells you nothing about the same invention in Europe or Asia. Two tools cover the rest.
For applications filed under the Patent Cooperation Treaty, WIPO’s PATENTSCOPE database provides published PCT applications in full text on the day of publication, along with patent documents from participating national and regional offices.12WIPO. PATENTSCOPE You can search by document number, inventor or applicant name, keywords, or International Patent Classification codes, with a Boolean advanced-search mode for targeted queries.
To follow a family of related applications across the largest patent offices, use Global Dossier. It pulls file histories from the USPTO, the European Patent Office, the Japan Patent Office, the Korean Intellectual Property Office, and the China National Intellectual Property Administration. Enter any publicly available application number and you’ll see the whole family, including prosecution status, classification data, and cited references.13United States Patent and Trademark Office. Global Dossier
Confirming Maintenance Fees Have Been Paid
Utility patents don’t stay alive for 20 years on their own. The owner must pay maintenance fees at three points after grant, and missing them causes the patent to expire early. Design and plant patents have no maintenance fees.3Office of the Law Revision Counsel. 35 U.S. Code 41 – Patent Fees; Patent and Trademark Search Systems
The three payment windows for utility patents fall at 3.5, 7.5, and 11.5 years after grant. Each has a six-month window before the due date and a six-month grace period after; if the grace period passes without payment, the patent expires.14United States Patent and Trademark Office. Maintain Your Patent The 11.5-year payment is the highest and catches some owners off guard. When Patent Center shows a utility patent as expired well before the 20-year mark, missed maintenance fees are the likely reason.
Working Out the Real Expiration Date
Filing date plus 20 years is a starting point, not an answer. Two adjustments change the real expiration date, sometimes by years.
Patent Term Adjustment extends the term to compensate for USPTO delays during examination, such as the office taking too long to issue a first action, the patent failing to issue within three years of filing, or delays from interference proceedings or secrecy orders. The PTA amount is calculated at issuance, printed on the face of the patent, and shown in Patent Center.7United States Patent and Trademark Office. Explanation of Patent Term Adjustment Calculation
Terminal disclaimers cut the term short. An applicant typically files one when the USPTO requires a later patent to expire at the same time as a closely related earlier one. The face of the patent won’t necessarily reflect this; you have to check the disclaimer in the file history.15United States Patent and Trademark Office. 2701 Patent Term
When Abandoned or Expired Doesn’t Mean Gone
If you’re planning to use technology based on a patent that looks dead, don’t stop there. Abandoned applications can be revived by petition based on unintentional delay under 37 CFR 1.137(b), with a statement that the entire delay was unintentional, the required fee, and whatever response or payment caused the abandonment. Petitions filed more than two years after abandonment face a higher fee and require a more detailed explanation.16United States Patent and Trademark Office. Revival Based on Unintentional Delay
Patents that lapsed for missed maintenance fees use the same “unintentional delay” standard. Petitions filed within two years of expiration go through the USPTO’s automated ePetition system; after two years, the owner has to supply more explanation.17United States Patent and Trademark Office. Acceptance of Delayed Payment of Maintenance Fee in Expired Patent to Reinstate Patent Before committing resources, check the file history for any pending revival petition.