Term ends Dec 16, 2036 · High confidence
20-year base term ends Dec 16, 2036
Held by Seattle Project Corp.
Filed Mar 22, 2017 as application 15/466,729 · Granted Aug 21, 2018
Base term, 20 years from filing
Today
2016
2036
Clock starts
Dec 16, 2016
Dec 16, 2016
Term ends
Dec 16, 2036
Dec 16, 2036
Granted
Aug 21, 2018
Aug 21, 2018
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.
None
Terminal disclaimer
No disclaimer on this record.
2 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.
7
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. 2 of 3 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 Dec 16, 2016, when application 15/381,375, the earliest non-provisional in its chain, was filed (this one was filed Mar 22, 2017) | Dec 16, 2036 | 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 | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 16, 2036 | High confidence |
This family
| Application 15/381,375 | Abandoned not computed | not computed |
| US 10,055,540 | this patent Dec 2036 | Dec 2036 |
| US 10,847,252 | In force Dec 2036 | Dec 2036 |
| US 10,847,253 | In force Dec 2036 | Dec 2036 |
| Application 16/128,421 | Abandoned not computed | not computed |
| US 11,183,286 | In force Dec 2036 | Dec 2036 |
| Application 17/101,522 | Abandoned not computed | not computed |
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 |
|---|---|---|---|
| May 20, 2017 Reel 42445, frame 264 | Yelensky, Roman; Derti, Adnan; Bulik-sullivan, B; Busby, Jennifer | Gritstone Oncology, Inc. | Assignment of Assignor's Interest |
| May 6, 2021 Reel 56171, frame 666 | Gritstone Oncology, Inc. | Gritstone Bio, Inc. | Change of Name |
| Apr 7, 2025 Reel 70760, frame 165 | Gritstone Bio, Inc. | Seattle Project Corp. | Assignment of Assignor's Interest |
| Apr 25, 2025 Reel 71079, frame 653 | Gritstone Bio, Inc. | Seattle Project Corp. | Corrective Assignment to Correct the Erroneous Reference to Application Numbers 10847252, 10847253 and 11183286 to Instead Reflect the Patent Numbers Listed in the Recorded Assignment Document Previously Recorded on Reel 70760 Frame 165. Assignor(S) Hereby Confirms the the Assignment. |
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.
What's changing
Dec 2036
Term ends Dec 16, 2036. Maintenance fees still fall due before then
Citations
24
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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.