Term ends Aug 15, 2031 · High confidence
20-year base term ends Jan 25, 2031
Held by Heartflow, Inc.
Filed May 17, 2021 as application 17/322,193 · Granted Oct 24, 2023
Base term plus 202 days of patent term adjustment (USPTO delay)
Today
2011
2031
Clock starts
Jan 25, 2011
Jan 25, 2011
Term ends
Aug 15, 2031
Aug 15, 2031
Granted
Oct 24, 2023
Oct 24, 2023
base term
patent term adjustment
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
202
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
0 of 1
Maintenance fees paid
One maintenance fee can end this term early, the one due 3.5 years from grant; the next one's grace period runs past the term end. This counts it if the record shows it paid.
77
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 202 days past its 20-year base term on prosecution delay. 0 of 1 maintenance fees are 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 Jan 25, 2011, when application 13/013,561, the earliest non-provisional in its chain, was filed (this one was filed May 17, 2021) | Jan 25, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +202 days, USPTO patent term adjustment record | Aug 15, 2031 | 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 | 0 of 1 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Aug 15, 2031 | High confidence |
This family
| US 8,315,812 | In force Jan 2031 | Jan 2031 |
| US 8,734,356 | In force Jan 2031 | Jan 2031 |
| US 8,496,594 | In force Jan 2031 | Jan 2031 |
| US 8,315,813 | In force Jan 2031 | Jan 2031 |
| US 8,734,357 | In force Jan 2031 | Jan 2031 |
| US 8,315,814 | In force Jan 2031 | Jan 2031 |
| US 8,311,747 | In force Jan 2031 | Jan 2031 |
| US 8,311,748 | In force no later than Jan 2031 | no later than Jan 2031 |
8 of 77 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 |
|---|---|---|---|
| Sep 17, 2021 Reel 57520, frame 78 | Taylor, Charles A. | Heartflow, Inc. | Assignment of Assignor's Interest |
| Jun 18, 2024 Reel 67775, frame 966 | Heartflow, Inc. | Hayfin Services LLP | Security Interest |
| Sep 11, 2025 Reel 72876, frame 775 | Hayfin Services LLP | Heartflow, 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Aug 2031
Term ends Aug 15, 2031. Maintenance fees still fall due before then
Note
The 202 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
90
later US patents cite this one
That is top 1% of utility patents granted in 2023 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.