Free tools · IPR deadline calculator
IPR one-year bar and PTAB milestones, calculated.
An inter partes review petition is time-barred if filed more than one year after the petitioner, its real party in interest or a privy was served with a complaint alleging infringement of the patent (35 U.S.C. §315(b)). Enter the service date below for the last day to file, and the petition's filing date for the usual PTAB milestones that follow it.
By patent number
One number, any format. Pick what you want to know about it, or ask for everything.
Free. Five lookups a day per visitor; fifteen with an email. The examiner's search log is read by a paid transcription, so it is limited to three new patents a day per visitor and twenty for everyone. A patent already read is always free and never counts. Resets at midnight UTC.
Every answer shown here, by email, with a link back. Also lifts your limit to fifteen lookups a day.
Deadline calculators
Dates in, dates out. The IPR one-year bar, the PTAB milestones, a contest's close in your own zone, the PCT national phase and the EP opposition window.
Date the complaint was served (35 U.S.C. §315(b)).
Date the IPR petition was filed.
The close as posted, Eastern Time.
Earliest priority date. 30 months for most offices; 31 for the EP and some others.
Date the mention of the EP grant was published. An opposition is due 9 months later (Art. 99 EPC).
Statutory and rule-based intervals, counted in calendar days; the PTAB lines are the usual milestones, and the Board's own scheduling order governs. Not legal advice. Feeds the invalidity search.
WO / PCT report reader
A WO number in; out: the international search report's citations with their X, Y and A categories and the claims each was aimed at, the earliest priority, the national-phase dates, and whether the US national phase has been entered.
International search report · EPO record
- X
- Y
- A
X: relevant alone. Y: relevant combined with another. A: background. Only the searching authority's own citations are listed, not the applicant's. National-phase limits vary by office; check the WIPO PCT time-limits table for the one you need.
Wayback date-prover
A URL in; out: the earliest archived capture of the page and its link, as a citable line for dating a manual, a datasheet or a product page. A capture proves the page existed by that date; it says nothing about when it was first published. Feeds the non-patent literature sweep.
From the Wayback Machine
About this tool
The bar runs from service of the complaint, not its filing, and applies even if the suit is later dismissed without prejudice. A petition filed with a motion for joinder to an instituted IPR is exempt from the bar.
After a petition is accorded a filing date, the patent owner's preliminary response is due in three months, the Board decides institution within three months of that response, and a final written decision follows within one year of institution. The Board's own scheduling order governs every date.
Questions
- When does the IPR one-year clock start?
- On the date the complaint alleging infringement was served on the petitioner, its real party in interest or a privy.
- How long does an IPR take?
- About 18 months from petition to final written decision: roughly six months to an institution decision, then twelve to the decision.