Term ends Apr 10, 2033 · High confidence
20-year base term ends Mar 13, 2033
Held by TC1 LLC
Filed Oct 29, 2020 as application 17/083,505 · Granted Apr 26, 2022
Base term plus 28 days of patent term adjustment (USPTO delay)
Today
2013
2033
Clock starts
Mar 13, 2013
Mar 13, 2013
Term ends
Apr 10, 2033
Apr 10, 2033
Granted
Apr 26, 2022
Apr 26, 2022
base term
patent term adjustment
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
28
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. 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.
This patent's term runs 28 days past its 20-year base term on prosecution delay. 1 of 2 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.
| 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 Oct 29, 2020) | Mar 13, 2033 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +28 days, USPTO patent term adjustment record | Apr 10, 2033 | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 10, 2033 | High 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 | Lapsed on the fee record 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 | this patent 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 |
|---|---|---|---|
| Oct 29, 2020 Reel 54210, frame 874 | Zeng, Zijing; Yuen, Phyllis; Butler, Michael R. | Thoratec Corporation | Assignment of Assignor's Interest |
| Oct 29, 2020 Reel 54250, frame 277 | Thoratec Corporation | Thoratec LLC | Assignment of Assignor's Interest |
| Oct 29, 2020 Reel 54250, frame 319 | 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.
What's changing
Apr 2033
Term ends Apr 10, 2033. Maintenance fees still fall due before then
Note
The 28 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
24
later US patents cite this one
That is top 5% of utility patents granted in 2022 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.