Term ends Dec 22, 2031 · High confidence
20-year base term ends Sep 23, 2031
Held by Merck Patent GmbH
Filed Sep 23, 2011 as application 13/243,640 · Granted Apr 8, 2014
Base term plus 90 days of patent term adjustment (USPTO delay)
Today
2011
2031
Clock starts
Sep 23, 2011
Sep 23, 2011
Term ends
Dec 22, 2031
Dec 22, 2031
Granted
Apr 8, 2014
Apr 8, 2014
base term
patent term adjustment
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
90
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
2
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 90 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Sep 23, 2011, when this application, 13/243,640, was filed | Sep 23, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +90 days, USPTO patent term adjustment record | Dec 22, 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 22, 2031 | High confidence |
This family
| US 8,691,925 | this patent Dec 2031 | Dec 2031 |
| US 9,052,598 | In force Sep 2031 | Sep 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 |
|---|---|---|---|
| May 31, 2012 Reel 28315, frame 234 | Wu, Hengpeng; Cao, Yi; Hong, Sungeun; Yin, Jian; Paunescu, Margareta; Neisser, Mark O.; Lin, Guanyang | Az Electronic Materials USA Corp. | Assignment of Assignor's Interest |
| Feb 12, 2014 Reel 32205, frame 673 | Az Electronic Materials USA Corp. | Az Electronic Materials (Luxembourg) S.A.R.L. | Assignment of Assignor's Interest |
| Jan 12, 2017 Reel 41345, frame 585 | Az Electronic Materials (Luxembourg) S.À R.L. | Az Electronic Materials (Luxembourg) S.À R.L. | Change of Address |
| Jul 27, 2020 Reel 53323, frame 591 | Ridgefield Acquisition | Az Electronic Materials S.À R.L. | Merger |
| Jul 27, 2020 Reel 53323, frame 760 | Az Electronic Materials S.À R.L. | Az Electronic Materials GmbH | Change of Legal Entity |
| Jul 27, 2020 Reel 53323, frame 770 | Az Electronic Materials GmbH | Merck Patent GmbH | Assignment of Assignor's Interest |
| Jul 27, 2020 Reel 53324, frame 198 | Az Electronic Materials (Luxembourg) S.À R.L. | Ridgefield Acquisition | Merger |
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
Dec 2031
Term ends Dec 22, 2031. No further fees fall due before then
Note
The 90 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
107
later US patents cite this one
That is top 5% 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.