Term ends no later than Apr 30, 2031 · Medium confidence
20-year base term ends Mar 24, 2031
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 Phio Pharmaceuticals Corp.
Filed May 12, 2020 as application 15/930,377 · Granted Feb 21, 2023
Base term plus 37 days of patent term adjustment (USPTO delay)
Today
2011
2031
Clock starts
Mar 24, 2011
Mar 24, 2011
Ends no later than
Apr 30, 2031
Apr 30, 2031
Granted
Feb 21, 2023
Feb 21, 2023
base term
patent term adjustment
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
37
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
0 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 runs 37 days past its 20-year base term on prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 0 of 2 maintenance fees are paid so far. 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 24, 2011, when application PCT/US2011/029849, the earliest non-provisional in its chain, was filed (this one was filed May 12, 2020) | Mar 24, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +37 days, USPTO patent term adjustment record | Apr 30, 2031 | High confidence |
| Terminal disclaimer cap | Disclaimer on file (filed), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | no later than Apr 30, 2031 | Medium confidence |
This family
| Application PCT/US2011/029849 | PCT application no patent term | no patent term |
| US 9,095,504 | In force Mar 2031 | Mar 2031 |
| US 10,184,124 | In force no later than Mar 2031 | no later than Mar 2031 |
| US 10,662,430 | In force Mar 2031 | Mar 2031 |
| US 11,584,933 | this patent no later than Apr 2031 | no later than Apr 2031 |
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 |
|---|---|---|---|
| Dec 3, 2020 Reel 54535, frame 429 | Pavco, Pamela A. | Rxi Pharmaceuticals Corporation | Assignment of Assignor's Interest |
| Dec 3, 2020 Reel 54585, frame 214 | Libertine, Lyn; Khvorova, Anastasia; Salomon, William; Kamens, Joanne; Samarsky, Dmitry; Woolf, Tod M.; Cardia, James | Rxi Pharmaceuticals Corporation | Assignment of Assignor's Interest |
| Dec 3, 2020 Reel 54585, frame 863 | 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
Apr 2031
Term ends no later than Apr 30, 2031.
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 37 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Open question
A terminal disclaimer is on file (filed) and its reference document is not resolved. A disclaimer would cap the term earlier than Apr 30, 2031. We will not guess the cap.
Citations
7
later US patents cite this one
That is top 10% of utility patents granted in 2023 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.