Lapsed Aug 7, 2026 on the fee record · Low confidence

Computed 20-year base term

Second maintenance fee unpaid; grace period ended. The USPTO has not yet posted the lapse.

Held by TC1 LLC

Filed May 8, 2017 as application 15/589,366 · Granted Aug 7, 2018

Base term, 20 years from filing

Today

Lapsed Aug 7, 2026

2013 2033

Clock starts
Mar 13, 2013

No longer in force
Aug 7, 2026

Granted
Aug 7, 2018

Term would have run to
Mar 13, 2033

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.

No effect

Terminal disclaimer

Resolved from the filed document, referencing US 9,675,740, to Mar 13, 2033. The term already ends on or before that date, so the cap shortened nothing.

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.

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 Mar 13, 2033: its 20-year base term, with no adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. Confidence: Low. 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.

Step	Input	Date after this step	Confidence
Base term, 20 years from filing	Clock starts Mar 13, 2013, when application 13/802,570, the earliest non-provisional in its chain, was filed (this one was filed May 8, 2017)	Mar 13, 2033	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	None on file	no change	High confidence
Terminal disclaimer cap	Disclaimer resolved from the filed document (refs US 9,675,740)	resolves to Mar 13, 2033, no earlier than this term, so no change	High confidence
Patent term extension	None on file	no change	High confidence
Fee events	The fee record shows no payment for this window, and USPTO's status still reads "Patented Case"	lapsed Aug 7, 2026	Medium confidence
Further caveats on record	The record rates this date lower than the steps above account for	Low confidence overall	Low confidence
Computed term end	The steps above, in order	Aug 7, 2026	Low confidence

This family

US 8,721,517	In force Mar 2033	Mar 2033
US 9,327,067	In force Mar 2033	Mar 2033
US 9,675,740	In force Mar 2033	Mar 2033
US 10,039,872	this patent Aug 2026	Aug 2026
US 10,765,789	In force Jul 2033	Jul 2033
US 11,229,786	In force Mar 2033	Mar 2033
US 11,260,213	In force Mar 2033	Mar 2033
US 11,311,712	In force Apr 2033	Apr 2033

8 of 13 applications in this family shown, earliest filings first. 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.

Recorded	Assignor	Assignee	Conveyance
Jul 31, 2017 Reel 43144, frame 512	Zeng, Zijing; Yuen, Phyllis; Butler, Michael R.	Thoratec Corporation	Assignment of Assignor's Interest
Jul 31, 2017 Reel 43379, frame 779	Thoratec Corporation	Thoratec LLC	Assignment of Assignor's Interest
Jul 31, 2017 Reel 43379, frame 865	Thoratec LLC	TC1 LLC	Assignment of Assignor's 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.

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Terminal disclaimer

A terminal disclaimer resolved from the filed document, referencing US 9,675,740, ends no earlier than this term, so it caps nothing.

Citations

later US patents cite this one

That is top 5% of utility patents granted in 2018 in our data, the only group it is compared against. How we rank

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.

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