Lapsed Apr 17, 2026 on the fee record · Medium confidence
20-year base term ends Jan 9, 2027
Why Medium: A terminal disclaimer is on file (approved) with no resolved reference, so the term may end earlier.
Second maintenance fee unpaid; grace period ended.
Held by Omya International AG
Filed Sep 12, 2008 as application 12/087,555 · Granted Apr 17, 2018
Base term, 20 years from filing, plus 1512 days of patent term adjustment (USPTO delay)
Today
Lapsed Apr 17, 2026
2007
2031
Clock starts
Jan 9, 2007
Jan 9, 2007
No longer in force
Apr 17, 2026
Apr 17, 2026
Granted
Apr 17, 2018
Apr 17, 2018
Term would have run to
Mar 1, 2031
Mar 1, 2031
base term
patent term adjustment
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
1,512
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.
1 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.
32
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 Mar 1, 2031: its 20-year base term plus 1512 days of term 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 Jan 9, 2007, when application PCT/IB2007/000076, the earliest non-provisional in its chain, was filed (this one was filed Sep 12, 2008) | Jan 9, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1512 days, USPTO patent term adjustment record | Mar 1, 2031 | 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 | 1 of 3 maintenance fees paid | lapsed Apr 17, 2026 | High confidence |
| Computed term end | The steps above, in order | Apr 17, 2026 | Medium confidence |
This family
| US 8,889,068 | In force Dec 2026 | Dec 2026 |
| US 9,944,815 | this patent Apr 2026 | Apr 2026 |
| US 8,999,284 | In force Nov 2031 | Nov 2031 |
| US 10,221,316 | In force Jun 2031 | Jun 2031 |
| US 8,974,877 | In force Sep 2031 | Sep 2031 |
| US 9,029,448 | In force Nov 2031 | Nov 2031 |
| US 8,877,127 | Term ended Jan 2026 | Jan 2026 |
| US 10,221,317 | In force Sep 2032 | Sep 2032 |
8 of 32 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 |
|---|---|---|---|
| Aug 14, 2008 Reel 21393, frame 607 | Buri, Matthias; Gane, Patrick A.c.; Hunziker, Philipp; Burkhalter, Rene; Karth, Beat | Omya Development AG | Assignment of Assignor's Interest |
| Oct 14, 2013 Reel 31406, frame 917 | Omya Development AG | Omya International AG | 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.
What's changing
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 1512 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 (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Apr 17, 2026. We will not guess the cap.
Citations
11
later US patents cite this one
That is top 25% of utility patents granted in 2018 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.