Term ends no later than Mar 21, 2028 · Low confidence
20-year base term ends Mar 21, 2028
In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.
Held by Gilead Sciences, Inc.
Filed Mar 12, 2015 as application 14/656,546 · Granted Mar 7, 2017
Base term, 20 years from filing
Today
2008
2028
Clock starts
Mar 21, 2008
Mar 21, 2008
Ends no later than
Mar 21, 2028
Mar 21, 2028
Granted
Mar 7, 2017
Mar 7, 2017
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.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
2 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.
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. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 2 of 2 maintenance fees are paid so far. Confidence: Low. 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 Mar 12, 2015); 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 | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | no later than Mar 21, 2028 | Low 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 | In force Mar 2028 | Mar 2028 |
| US 8,906,880 | In force Mar 2028 | Mar 2028 |
| US 9,585,906 | this patent 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 7, 2015 Reel 35351, frame 87 | Sofia, Michael Joseph; Du, Jinfa; Wang, Peiyuan; Nagarathnam, Dhanapalan | Pharmasset, Inc. | Assignment of Assignor's Interest |
| Apr 7, 2015 Reel 35386, frame 358 | 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.
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Alerts on its grants, lapses and transfers.
What's changing
Mar 2028
Term ends no later than Mar 21, 2028. No further fees fall due before then
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Mar 21, 2028. We will not guess the cap.
Citations
18
later US patents cite this one
That is top 25% of utility patents granted in 2017 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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. 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.