Lapsed May 22, 2026 on the fee record · High confidence
20-year base term ends Mar 19, 2028
Second maintenance fee unpaid; grace period ended.
Held by Ambrx, Inc.
Filed Oct 13, 2016 as application 15/292,700 · Granted May 22, 2018
Base term, 20 years from filing
Today
Lapsed May 22, 2026
2008
2028
Clock starts
Mar 19, 2008
Mar 19, 2008
No longer in force
May 22, 2026
May 22, 2026
Granted
May 22, 2018
May 22, 2018
Term would have run to
Mar 19, 2028
Mar 19, 2028
base term
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
None
Term adjustment
No prosecution delay on this record.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 8,383,365, to Mar 19, 2028. The term already ends on or before that date, so the cap shortened nothing.
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.
8
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 Mar 19, 2028: 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. 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 19, 2008, when application 12/051,830, the earliest non-provisional in its chain, was filed (this one was filed Oct 13, 2016) | Mar 19, 2028 | 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 8,383,365) | resolves to Mar 19, 2028, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 2 maintenance fees paid | lapsed May 22, 2026 | High confidence |
| Computed term end | The steps above, in order | May 22, 2026 | High confidence |
This family
| US 8,012,931 | In force Mar 2028 | Mar 2028 |
| US 8,383,365 | In force Mar 2028 | Mar 2028 |
| US 9,079,971 | In force Mar 2028 | Mar 2028 |
| US 9,517,273 | In force Mar 2028 | Mar 2028 |
| US 9,975,936 | this patent May 2026 | May 2026 |
| US 10,377,805 | In force Mar 2028 | Mar 2028 |
| US 10,961,291 | In force Mar 2028 | Mar 2028 |
| US 11,993,637 | In force Mar 2028 | Mar 2028 |
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 13, 2018 Reel 45534, frame 824 | Cujec, Thomas P.; Mariani, Roberto; Hays Putnam, Anna-maria A.; Keefe, William M.; Knudsen, Nick; Ho, Lillian; Pinkstaff, Jason; Kraynov, Vadim | 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.
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 8,383,365, ends no earlier than this term, so it caps nothing.
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.