Also listed on Espero Biopharma, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Dec 18, 2031 · Medium confidence
20-year base term ends Nov 23, 2030
Why Medium: A parent in the chain could not be resolved.
Held by Xyra, LLC
Filed Feb 4, 2013 as application 13/758,687 · Granted Jan 24, 2017
Base term plus 390 days of patent term adjustment (USPTO delay)
Today
2010
2031
Clock starts
Nov 23, 2010
Nov 23, 2010
Term ends
Dec 18, 2031
Dec 18, 2031
Granted
Jan 24, 2017
Jan 24, 2017
base term
patent term adjustment
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
390
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 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.
4
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 390 days past its 20-year base term on prosecution delay. 2 of 3 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 Nov 23, 2010, when applications 12/952,666, 12/952,683 and 12/952,696, the earliest non-provisional applications in its chain, were filed (this one was filed Feb 4, 2013); a parent in its chain could not be resolved (the next row) | Nov 23, 2030 | 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 | +390 days, USPTO patent term adjustment record | Dec 18, 2031 | 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 | 2 of 3 maintenance fees paid | In force (reinstated) | High confidence |
| Computed term end | The steps above, in order | Dec 18, 2031 | Medium confidence |
This family
| US 9,549,912 | this patent Dec 2031 | Dec 2031 |
1 of 4 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 17, 2013 Reel 30237, frame 109 | Milner, Peter G.; Ellis, David J.; Aryx Therapeutics, Inc. | Armetheon, Inc. | Assignment of Assignor's Interest |
| Apr 16, 2019 Reel 48918, frame 544 | Espero Biopharma, Inc. | Horizon Technology Finance Corporation | Security Interest |
| Jul 23, 2020 Reel 53293, frame 930 | Armetheon, Inc. | Espero Biopharma, Inc. | Change of Name |
| Oct 23, 2020 Reel 54150, frame 11 | Espero Biopharma, Inc. | Hesp LLC | Assignment of Assignor's Interest |
| Jun 4, 2025 Reel 71313, frame 627 | Hesp LLC | Xyra, LLC | 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.
What's changing
Dec 2031
Term ends Dec 18, 2031. Maintenance fees still fall due before then
Note
The 390 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
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
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.