The Patent Finder

Polycorp Ltd.

Also on record
Records under this name other than the patents Polycorp Ltd. holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned. None of them is counted in the 20 patents it holds.

Showing 1 to 4 of 4 · Back to Polycorp Ltd.

PatentTitleStatus Expires Confidence
US 8,308,906Unidirectional Discharge Grate Assembly
Lapsed on the fee record
Ended Nov 13, 2024 · High confidence
Lapsed on the fee recordEnded Nov 13, 2024High confidence
US D536,955Mat Connector
Term ended
Term ended Feb 20, 2021 · High confidence
Term endedTerm ended Feb 20, 2021High confidence
US 6,213,407Two-piece rail seal clip and tool for installing same
Term ended
Term ended Nov 24, 2018 · From the USPTO record
Term endedTerm ended Nov 24, 2018From the USPTO record
US 4,606,498Rail seal
Term ended
Term ended no later than Aug 19, 2006 · Low confidence
Term endedTerm ended no later than Aug 19, 2006Low confidence
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