Lapsed Dec 29, 2024 on the fee record · Medium confidence
20-year base term ends Sep 22, 2029
Why Medium: A terminal disclaimer is on file (approved) with no resolved reference, so the term may end earlier.
First maintenance fee unpaid; grace period ended.
Held by Phio Pharmaceuticals Corp.
Filed Jun 28, 2018 as application 16/022,652 · Granted Dec 29, 2020
Base term, 20 years from filing
Today
Lapsed Dec 29, 2024
2009
2029
Clock starts
Sep 22, 2009
Sep 22, 2009
No longer in force
Dec 29, 2024
Dec 29, 2024
Granted
Dec 29, 2020
Dec 29, 2020
Term would have run to
Sep 22, 2029
Sep 22, 2029
base term
after the term ends
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.
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.
7
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Sep 22, 2029: 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. 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 Sep 22, 2009, when application PCT/US2009/005247, the earliest non-provisional in its chain, was filed (this one was filed Jun 28, 2018) | Sep 22, 2029 | 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 | 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 | 0 of 2 maintenance fees paid | lapsed Dec 29, 2024 | High confidence |
| Computed term end | The steps above, in order | Dec 29, 2024 | Medium confidence |
This family
| Application PCT/US2009/005247 | PCT application no patent term | no patent term |
| US 10,041,073 | Lapsed on the fee record Aug 2026 | Aug 2026 |
| US 8,796,443 | In force no later than May 2030 | no later than May 2030 |
| US 9,175,289 | In force no later than Sep 2029 | no later than Sep 2029 |
| US 10,774,330 | In force no later than Sep 2029 | no later than Sep 2029 |
| US 10,876,119 | this patent Dec 2024 | Dec 2024 |
| Application 16/934,864 | Pending 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 |
|---|---|---|---|
| Oct 15, 2018 Reel 47228, frame 869 | Khvorova, Anastasia; Salomon, William; Kamens, Joanne; Samarsky, Dmitry; Woolf, Tod M.; Cardia, James | 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
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 Dec 29, 2024. We will not guess the cap.
Citations
21
later US patents cite this one
That is top 10% of utility patents granted in 2020 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.