Term ends no later than Jan 25, 2031 · Medium confidence
20-year base term ends Jan 25, 2031
In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.
Held by Heartflow, Inc.
Filed Jan 27, 2011 as application 13/014,845 · Granted Nov 13, 2012
Base term, 20 years from filing
Today
2011
2031
Clock starts
Jan 25, 2011
Jan 25, 2011
Ends no later than
Jan 25, 2031
Jan 25, 2031
Granted
Nov 13, 2012
Nov 13, 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.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
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 on file with no resolved reference, so no cap is applied and none is guessed. All three maintenance fees are recorded paid; no more fees are due. Confidence: Medium. 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 Jan 27, 2011) | 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 on file (approved), reference document not resolved | no cap applied, and none guessed | Medium 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 | no later than Jan 25, 2031 | Medium 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 | this patent 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 26, 2017 Reel 43687, frame 635 | Taylor, Charles A.; Fonte, Timothy A.; Choi, Gilwoo | 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 no later than Jan 25, 2031. No further fees fall due before then
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Jan 25, 2031. We will not guess the cap.
Citations
328
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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. 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.