Term ends Jan 25, 2031 · High confidence
20-year base term ends Jan 25, 2031
Held by Heartflow, Inc.
Filed Jan 25, 2011 as application 13/013,561 · Granted Nov 20, 2012
Base term, 20 years from filing
Today
2011
2031
Clock starts
Jan 25, 2011
Jan 25, 2011
Term ends
Jan 25, 2031
Jan 25, 2031
Granted
Nov 20, 2012
Nov 20, 2012
base term
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 8,157,742, to Jan 25, 2031. The term already ends on or before that date, so the cap shortened nothing.
3 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.
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 is 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. All three maintenance fees are recorded paid; no more fees are due. 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 this application, 13/013,561, was filed | Jan 25, 2031 | 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 8,157,742) | resolves to Jan 25, 2031, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Jan 25, 2031 | High confidence |
This family
| US 8,315,812 | this patent 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 |
|---|---|---|---|
| Jan 25, 2011 Reel 25695, frame 938 | Taylor, Charles A.; Fonte, Timothy A.; Choi, Gilwoo; Bai, Ying; Zarins, Christopher K. | Heartflow, Inc. | Assignment of Assignor's Interest |
| Jan 20, 2021 Reel 55037, frame 890 | Heartflow, Inc. | Hayfin Services LLP | Security Interest |
| Jun 18, 2024 Reel 67775, frame 966 | Heartflow, Inc. | Hayfin Services LLP | Security Interest |
| Jun 21, 2024 Reel 67801, frame 32 | Hayfin Services LLP | Heartflow, Inc. | Release of 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
Jan 2031
Term ends Jan 25, 2031. No further fees fall due before then
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 8,157,742, ends no earlier than this term, so it caps nothing.
Citations
648
later US patents cite this one
That is top 1% of utility patents granted in 2012 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.