Lapsed Aug 7, 2026 on the fee record · Low confidence
20-year base term ends Mar 13, 2033
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
Mar 13, 2013
No longer in force
Aug 7, 2026
Aug 7, 2026
Granted
Aug 7, 2018
Aug 7, 2018
Term would have run to
Mar 13, 2033
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.
13
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.
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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
47
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.