Term ended Jan 31, 2026 · High confidence
20-year base term ended Jan 31, 2026
Held by Stamicarbon B.V.
Filed Aug 22, 2007 as application 11/883,384 · Granted May 19, 2009
Base term, 20 years from filing
Today
Term ended Jan 31, 2026
2006
2026
Clock starts
Jan 31, 2006
Jan 31, 2006
Term ended
Jan 31, 2026
Jan 31, 2026
Granted
May 19, 2009
May 19, 2009
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
None
Term adjustment
No prosecution delay on this record.
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.
19
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 is its 20-year base term, with no adjustment for prosecution delay. All three maintenance fees were paid, so no fee lapse ended it. 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 Jan 31, 2006, when application PCT/NL2006/000053, the earliest non-provisional in its chain, was filed (this one was filed Aug 22, 2007) | Jan 31, 2026 | 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 | 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 | term ended | High confidence |
| Computed term end | The steps above, in order | Jan 31, 2026 | High confidence |
This family
| US 8,808,517 | In force Oct 2028 | Oct 2028 |
| US 7,534,883 | this patent Jan 2026 | Jan 2026 |
| Application 11/885,666 | Abandoned not computed | not computed |
| US 7,700,012 | Term ended Oct 2026 | Oct 2026 |
| US 7,893,298 | Term ended Sep 2026 | Sep 2026 |
| US 8,236,086 | In force Feb 2028 | Feb 2028 |
| US 8,283,494 | In force Jul 2028 | Jul 2028 |
| US 8,506,671 | In force Jan 2030 | Jan 2030 |
8 of 19 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 22, 2007 Reel 19797, frame 685 | Mennen, Johannes Henricus | DSM IP Assets B.V. | Assignment of Assignor's Interest |
| Sep 10, 2010 Reel 24982, frame 110 | DSM IP Assets B.V. | Stamicarbon B.V. | 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.
Citations
0
later US patents cite this one
That is below the median of utility patents granted in 2009 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.