Term ends Mar 24, 2031 · High confidence
20-year base term ends Mar 24, 2031
Held by Phio Pharmaceuticals Corp.
Filed Mar 12, 2018 as application 15/918,605 · Granted Feb 9, 2021
Base term, 20 years from filing
Today
2011
2031
Clock starts
Mar 24, 2011
Mar 24, 2011
Term ends
Mar 24, 2031
Mar 24, 2031
Granted
Feb 9, 2021
Feb 9, 2021
base term
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 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.
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.
5
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. 1 of 2 maintenance fees is 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 Mar 24, 2011, when application PCT/US2011/029867, the earliest non-provisional in its chain, was filed (this one was filed Mar 12, 2018) | Mar 24, 2031 | 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 | 1 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Mar 24, 2031 | High confidence |
This family
| Application PCT/US2011/029867 | PCT application no patent term | no patent term |
| US 9,340,786 | In force Mar 2031 | Mar 2031 |
| US 9,963,702 | Lapsed on the fee record May 2026 | May 2026 |
| US 10,913,948 | this patent Mar 2031 | Mar 2031 |
| Application 17/150,934 | 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 |
|---|---|---|---|
| Jun 19, 2018 Reel 46392, frame 137 | Khvorova, Anastasia; Salomon, William; Kamens, Joanne; Samarsky, Dmitry; Woolf, Tod M.; Pavco, Pamela A.; Libertine, Lyn; Cardia, James; Bulock, Karen G. | Rxi Pharmaceuticals Corporation | Assignment of Assignor's Interest |
| Dec 7, 2018 Reel 48380, frame 9 | Rxi Pharmaceuticals Corporation | Phio Pharmaceuticals Corp. | Change of Name |
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 2031
Term ends Mar 24, 2031. Maintenance fees still fall due before then
Citations
24
later US patents cite this one
That is top 10% of utility patents granted in 2021 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.