The Patent Finder
US

Polymeric Acid Catalysts and Uses Thereof

US 8,476,388 Lapsed on the fee record
OverviewFamilyAssignmentsSources & methods

Lapsed Jul 2, 2025 on the fee record · High confidence

Third maintenance fee unpaid; grace period ended.

Filed Oct 22, 2012 as application 13/657,724 · Granted Jul 2, 2013
Base term, 20 years from filing
Today
Lapsed Jul 2, 2025
2012 2032
Clock starts
Feb 27, 2012
No longer in force
Jul 2, 2025
Granted
Jul 2, 2013
Term would have run to
Feb 27, 2032
base term after the term ends 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.
2 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.

Its term would have run to Feb 27, 2032: its 20-year base term, with no adjustment for prosecution delay. 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 Feb 27, 2012, when application 13/406,517, the earliest non-provisional in its chain, was filed (this one was filed Oct 22, 2012)Feb 27, 2032High 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 events2 of 3 maintenance fees paidlapsed Jul 2, 2025High confidence
Computed term endThe steps above, in orderJul 2, 2025High confidence

This family

US 8,466,242In force
Feb 2032
Feb 2032
US 8,476,388this patent
Jul 2025
Jul 2025
US 9,205,418In force
no later than Oct 2032
no later than Oct 2032
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
Feb 15, 2013
Reel 29820, frame 145
Geremia, John M.; Baynes, Brian M.; Dhawan, AshishMidori Renewables, Inc.Assignment of Assignor's Interest
Jun 30, 2015
Reel 36053, frame 912
Midori Renewables, Inc.Midori USA, Inc.Change of Name
Jul 24, 2017
Reel 43083, frame 379
Midori USA, Inc.Cadena Bio, Inc.Assignment of Assignor's Interest
Sep 9, 2022
Reel 61404, frame 320
Kaleido Biosciences, Inc.; Cardena Bio, Inc.Hercules Capital, Inc.Assignment of Assignor's Interest
Sep 10, 2022
Reel 61362, frame 1
Hercules Capital, Inc.DSM Nutritional Products, LLCAssignment of Assignor's Interest
Oct 18, 2022
Reel 61700, frame 414
Kaleido Biosciences, Inc.; Cadena Bio, Inc.Hercules Capital, Inc.Corrective Assignment to Correct the the Second Assignor Name Previously Recorded at Reel: 061404 Frame: 0320. Assignor(S) Hereby Confirms the Assignment.

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