The Patent Finder
US

Fuel Cell Stack

US 10,615,445 In force
OverviewFamilyAssignmentsSources & methods

Term ends May 3, 2038 · High confidence

Filed May 3, 2018 as application 15/969,876 · Granted Apr 7, 2020
Base term, 20 years from filing
Today
20 years from filing
2018 2038
Clock starts
May 3, 2018
Term ends
May 3, 2038
Granted
Apr 7, 2020
base term 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
None
Term adjustment
No prosecution delay on this record.
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 grant. This counts the ones the record shows paid.
3
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.

This patent's term is its 20-year base term, with no adjustment for prosecution delay. 1 of 3 maintenance fees is paid so far. Confidence: High. from the record

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.
StepInputDate after this stepConfidence
Base term, 20 years from filingClock starts May 3, 2018, when this application, 15/969,876, was filedMay 3, 2038High confidence
Continuity chainEvery parent in the chain resolvedno changeHigh confidence
Patent term adjustmentNone on fileno changeHigh 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 orderMay 3, 2038High confidence

This family

US 10,615,445this patent
May 2038
May 2038
Application PCT/US2019/030328PCT application
no patent term
no patent term
US 11,335,940In force
Jun 2038
Jun 2038
The applications whose file history this site holds. The family may have others.

Assignments

Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
RecordedAssignorAssigneeConveyance
May 3, 2018
Reel 45704, frame 32
Carlstrom, Charles M., JR.; Cacioppo, Michael Anthony; D'aleo, James; Elder, CharlesPlug Power Inc.Assignment of Assignor's Interest
Apr 1, 2019
Reel 48751, frame 396
Plug Power Inc.; Emerging Power Inc.; Emergent Power Inc.Generate Lending, LLCSecurity Interest
Apr 28, 2025
Reel 71084, frame 264
Plug Power Inc.; Applied Cryo Technologies, Inc.; Plug Power Hydrogen Holdings, Inc.; United Hydrogen Group Inc.; Alloy Custom Products, LLC; Joule Processing LLC; Peachtree Renewables, LLC; Plug Project Holding Co., LLC; Hypulsion U.S. Holding, Inc.Ya II PN, Ltd., in Its Capacity as Collateral AgentSecurity Interest
May 1, 2025
Reel 70996, frame 447
Generate Lending, LLCPlug Power Inc.; Emergent Power Inc.Release of Security Interest
May 1, 2025
reel/frame not recorded
Generate Lending, LLCPlug Power Inc.Release of Security Interest
May 1, 2025
reel/frame not recorded
Generate Lending, LLCEmergent Power Inc.Release of Security Interest
Nov 25, 2025
Reel 73036, frame 448
Ya II PN, Ltd., in Its Capacity as Collateral AgentPlug Power, Inc.; Plug Power Hydrogen Holdings, Inc.; United Hydrogen Group Inc.; Plug Project Holding Co., LLC; Peachtree Renewables, LLC; Joule Processing LLC; Applied Cryo Technologies, Inc.; Alloy Custom Products, LLC; Hypulsion U.S. Holding, Inc.Release of Security Interest
Nov 25, 2025
reel/frame not recorded
Ya II PN, Ltd., in Its Capacity as Collateral AgentPlug Power, Inc.Release of Security Interest
Nov 25, 2025
reel/frame not recorded
Ya II PN, Ltd., in Its Capacity as Collateral AgentPlug Power Hydrogen Holdings, Inc.Release of Security Interest
Nov 25, 2025
reel/frame not recorded
Ya II PN, Ltd., in Its Capacity as Collateral AgentUnited Hydrogen Group Inc.Release of Security Interest
Nov 25, 2025
reel/frame not recorded
Ya II PN, Ltd., in Its Capacity as Collateral AgentPlug Project Holding Co., LLCRelease of Security Interest
Nov 25, 2025
reel/frame not recorded
Ya II PN, Ltd., in Its Capacity as Collateral AgentPeachtree Renewables, LLCRelease of Security Interest
Nov 25, 2025
reel/frame not recorded
Ya II PN, Ltd., in Its Capacity as Collateral AgentJoule Processing LLCRelease of Security Interest
Nov 25, 2025
reel/frame not recorded
Ya II PN, Ltd., in Its Capacity as Collateral AgentApplied Cryo Technologies, Inc.Release of Security Interest
Nov 25, 2025
reel/frame not recorded
Ya II PN, Ltd., in Its Capacity as Collateral AgentAlloy Custom Products, LLCRelease of Security Interest
Nov 25, 2025
reel/frame not recorded
Ya II PN, Ltd., in Its Capacity as Collateral AgentHypulsion U.S. Holding, Inc.Release of Security Interest

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.

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