Term ends Mar 21, 2028 · Medium confidence
20-year base term ends Mar 21, 2028
Why Medium: A parent in the chain could not be resolved.
Held by Gilead Sciences, Inc.
Filed Apr 16, 2014 as application 14/254,737 · Granted Feb 17, 2015
Base term, 20 years from filing
Today
2008
2028
Clock starts
Mar 21, 2008
Mar 21, 2008
Term ends
Mar 21, 2028
Mar 21, 2028
Granted
Feb 17, 2015
Feb 17, 2015
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.
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.
16
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. 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 Mar 21, 2008, when application 12/053,015, the earliest non-provisional in its chain, was filed (this one was filed Apr 16, 2014); a parent in its chain could not be resolved (the next row) | Mar 21, 2028 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Mar 21, 2028 | Medium confidence |
This family
| US 7,964,580 | In force Mar 2029 | Mar 2029 |
| US 8,334,270 | In force Mar 2028 | Mar 2028 |
| US 8,580,765 | In force Mar 2028 | Mar 2028 |
| US 9,085,573 | In force Mar 2028 | Mar 2028 |
| US 8,735,372 | In force Mar 2028 | Mar 2028 |
| US 8,957,046 | this patent Mar 2028 | Mar 2028 |
| US 8,906,880 | In force Mar 2028 | Mar 2028 |
| US 9,585,906 | In force no later than Mar 2028 | no later than Mar 2028 |
8 of 16 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 |
|---|---|---|---|
| Jul 28, 2014 Reel 33404, frame 944 | Du, Jinfa; Nagarathnam, Dhanapalan; Sofia, Michael Joseph; Wang, Peiyuan | Pharmasset, Inc. | Assignment of Assignor's Interest |
| Jul 28, 2014 Reel 33429, frame 375 | Pharmasset, Inc. | Gilead Pharmasset LLC | Change of Name |
| Jan 28, 2022 Reel 58890, frame 229 | Gilead Pharmasset LLC | Gilead Sciences, 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
Mar 2028
Term ends Mar 21, 2028. No further fees fall due before then
Citations
50
later US patents cite this one
That is top 10% of utility patents granted in 2015 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.