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US RE50,335 In force
OverviewSources & methods

Term ends Sep 12, 2039 · Low confidence

Reissue of US 10,917,439, which was surrendered when this reissue was granted; its term and maintenance fees continue here.

Held by KnowBe4, Inc.
Filed Feb 8, 2023 as application 18/107,431 · Granted Mar 11, 2025
Base term plus 59 days of patent term adjustment (USPTO delay)
Today
20 years from filing
2019 2039
Clock starts
Jul 15, 2019
Term ends
Sep 12, 2039
Granted
Mar 11, 2025
base term patent term adjustment fee events Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
59
Days of term adjustment
Read from the original patent's USPTO patent term adjustment record, which governs a reissue. Not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from the original patent's grant (Feb 9, 2021). This counts the ones the record shows paid.

How we calculated this date

One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
Step Input Date after this step Confidence
Base term, 20 years from filingClock starts Jul 15, 2019, when the earliest non-provisional application in its chain was filed (this one was filed Feb 8, 2023)Jul 15, 2039High confidence
Continuity chainA reissue: its term follows the original patent's, with the original's term adjustmentfollows the original patentMedium confidence
Patent term adjustment+59 days, the original patent's USPTO patent term adjustment record, which governs a reissue (35 U.S.C. 251). This reissue's own record carries noneSep 12, 2039Medium confidence
Terminal disclaimer capNone on recordno cap appliedHigh confidence
Patent term extensionNone on fileno changeHigh confidence
Fee events1 of 3 maintenance fees paidIn forceHigh confidence
Computed term endThe steps above, in orderSep 12, 2039Low confidence

Sources

Google Patents · The patent document at USPTO · Assignment records at USPTO

USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup

Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.

Not on this page: the patent's family, its recorded assignments and its citation count. USPTO's assignment records, linked above, list every recorded assignment.

Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built

Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.

In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.

The Patent Finder CompaniesExpirationsCalculatorWatchlistPricing MethodologyCorrectionsLegalPrivacysupport@thepatentfinder.com Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) Part of 137 Finder · © 2026 137 Finder LLC · Sources cited