Term ends Mar 26, 2029 · High confidence
20-year base term ends Mar 21, 2028
Held by Gilead Sciences, Inc.
Filed Mar 21, 2008 as application 12/053,015 · Granted Jun 21, 2011
Base term plus 370 days of patent term adjustment (USPTO delay)
Today
2008
2029
Clock starts
Mar 21, 2008
Mar 21, 2008
Term ends
Mar 26, 2029
Mar 26, 2029
Granted
Jun 21, 2011
Jun 21, 2011
base term
patent term adjustment
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
370
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
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 runs 370 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 21, 2008, when this application, 12/053,015, was filed | Mar 21, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +370 days, USPTO patent term adjustment record | Mar 26, 2029 | 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 26, 2029 | High confidence |
This family
| US 7,964,580 | this patent 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 | In force 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 |
|---|---|---|---|
| Apr 1, 2008 Reel 20739, frame 883 | Sofia, Michael Joseph; Du, Jinfa; Wang, Peiyuan; Nagarathnam, Dhanapalan | Pharmasset, Inc. | Assignment of Assignor's Interest |
| Apr 20, 2012 Reel 28081, frame 686 | 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 2029
Term ends Mar 26, 2029. No further fees fall due before then
Note
The 370 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
158
later US patents cite this one
That is top 5% of utility patents granted in 2011 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.