Lapsed May 8, 2026 on the fee record · High confidence
20-year base term ends Aug 17, 2031
Second maintenance fee unpaid; grace period ended.
Held by Ambrx, Inc.
Filed Aug 17, 2016 as application 15/239,277 · Granted May 8, 2018
Base term, 20 years from filing, plus 86 days of patent term adjustment (USPTO delay)
Today
Lapsed May 8, 2026
2011
2031
Clock starts
Aug 17, 2011
Aug 17, 2011
No longer in force
May 8, 2026
May 8, 2026
Granted
May 8, 2018
May 8, 2018
Term would have run to
Nov 11, 2031
Nov 11, 2031
base term
patent term adjustment
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
86
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 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.
12
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 Nov 11, 2031: its 20-year base term plus 86 days of term adjustment for prosecution delay. 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 Aug 17, 2011, when application 13/212,101, the earliest non-provisional in its chain, was filed (this one was filed Aug 17, 2016) | Aug 17, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +86 days, USPTO patent term adjustment record | Nov 11, 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 | 1 of 3 maintenance fees paid | lapsed May 8, 2026 | High confidence |
| Computed term end | The steps above, in order | May 8, 2026 | High confidence |
This family
| US 8,735,539 | Lapsed on the fee record May 2026 | May 2026 |
| US 9,567,386 | In force Nov 2031 | Nov 2031 |
| US 9,452,222 | In force Aug 2031 | Aug 2031 |
| US 9,962,450 | this patent May 2026 | May 2026 |
| US 10,253,083 | In force Aug 2031 | Aug 2031 |
| US 10,702,588 | In force Aug 2031 | Aug 2031 |
| US 10,751,391 | In force Aug 2031 | Aug 2031 |
| US 11,311,605 | Lapsed on the fee record Apr 2026 | Apr 2026 |
8 of 12 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 |
|---|---|---|---|
| Apr 12, 2018 Reel 45514, frame 331 | Kraynov, Vadim; Knudsen, Nick; Hewet, Amha; De Dios, Kristine; Pinkstaff, Jason; Sullivan, Lorraine | Ambrx, Inc. | 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
Note
The 86 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
19
later US patents cite this one
That is top 25% 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.