Term ended Apr 12, 2024 · High confidence
20-year base term ended Apr 12, 2024
USPTO later recorded it as expired for non-payment on Jun 29, 2026.
Held by GRT US Holding, Inc.
Filed Aug 14, 2012 as application 13/585,692 · Granted May 27, 2014
Base term plus 31 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
Term ended Apr 12, 2024
2004
2026
Clock starts
Apr 12, 2004
Apr 12, 2004
Term ended
Apr 12, 2024
Apr 12, 2024
Granted
May 27, 2014
May 27, 2014
base term
after the term ends
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
31
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 8,263,093.
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.
6
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 31 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 Apr 12, 2004, when application 10/823,426, the earliest non-provisional in its chain, was filed (this one was filed Aug 14, 2012) | Apr 12, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +31 days, USPTO patent term adjustment record | May 13, 2024 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,263,093) | capped to Apr 12, 2024 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | term ended | High confidence |
| USPTO status record | Recorded as expired for non-payment on Jun 29, 2026, after the term ended | no change | High confidence |
| Computed term end | The steps above, in order | Apr 12, 2024 | High confidence |
This family
| US 7,943,166 | In force Sep 2027 | Sep 2027 |
| US 8,273,390 | Term ended Apr 2024 | Apr 2024 |
| US 8,263,093 | Term ended Apr 2024 | Apr 2024 |
| US 8,734,770 | this patent Apr 2024 | Apr 2024 |
| US 9,750,707 | Term ended Apr 2024 | Apr 2024 |
| US 10,653,647 | Term ended Apr 2024 | Apr 2024 |
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 |
|---|---|---|---|
| Aug 15, 2012 Reel 28793, frame 266 | Muhammad, Naweed; Jamieson, Gene C.; Bley, Keith R.; Chanda, Sanjay | Neurogesx, Inc. | Assignment of Assignor's Interest |
| Nov 13, 2012 Reel 29291, frame 807 | Neurogesx, Inc. | Hercules Technology Growth Capital, Inc. | Security Agreement |
| Jul 10, 2013 Reel 30777, frame 782 | Hercules Technology Growth Capital, Inc. | Neurogesx, Inc. | Assignment and Release of Security Interest |
| Dec 10, 2013 Reel 31751, frame 333 | Neurogesx, Inc. | Acorda Therapeutics, Inc. | Assignment of Assignor's Interest |
| Jun 10, 2016 Reel 38950, frame 436 | Acorda Therapeutics, Inc.; Civitas Therapeutics, Inc.; Neuronex, Inc. | JPMorgan Chase Bank, N.A., as Administrative Agent | Security Interest |
| May 31, 2017 reel/frame not recorded | JPMorgan Chase Bank, N.A., as Administrative Agent | Neuronex, Inc. | Release of Security Interest |
| May 31, 2017 reel/frame not recorded | JPMorgan Chase Bank, N.A., as Administrative Agent | Civitas Therapeutics, Inc. | Release of Security Interest |
| May 31, 2017 reel/frame not recorded | JPMorgan Chase Bank, N.A., as Administrative Agent | Acorda Therapeutics, Inc. | Release of Security Interest |
| May 31, 2017 Reel 42643, frame 878 | JPMorgan Chase Bank, N.A., as Administrative Agent | Neuronex, Inc.; Civitas Therapeutics, Inc.; Acorda Therapeutics, Inc. | Release of Security Interest |
| May 22, 2019 Reel 49260, frame 707 | Acorda Therapeutics, Inc. | Grünenthal GmbH | Assignment of Assignor's Interest |
| Aug 15, 2019 Reel 50065, frame 195 | Grünenthal GmbH | GRT US Holding, 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.
What's changing
Note
The 31 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 8,263,093.
Citations
14
later US patents cite this one
That is above the median of utility patents granted in 2014 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.