Term ended Sep 30, 2026 · Medium confidence
20-year base term ended May 15, 2026
Why Medium: A parent in the chain could not be resolved.
Held by Stamicarbon B.V.
Filed Mar 21, 2008 as application 11/919,991 · Granted Feb 22, 2011
Base term plus 138 days of patent term adjustment (USPTO delay)
Today
Term ended Sep 30, 2026
2006
2026
Clock starts
May 15, 2006
May 15, 2006
Term ended
Sep 30, 2026
Sep 30, 2026
Granted
Feb 22, 2011
Feb 22, 2011
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
138
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.
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 runs 138 days past its 20-year base term on prosecution delay. All three maintenance fees were paid, so no fee lapse ended it. 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 May 15, 2006, when application PCT/NL2006/000249, the earliest non-provisional in its chain, was filed (this one was filed Mar 21, 2008); a parent in its chain could not be resolved (the next row) | May 15, 2026 | 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 | +138 days, USPTO patent term adjustment record | Sep 30, 2026 | 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 | Sep 30, 2026 | Medium confidence |
This family
| US 8,808,517 | In force Oct 2028 | Oct 2028 |
| US 7,534,883 | Term ended 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 | this patent 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 |
|---|---|---|---|
| Mar 21, 2008 Reel 20685, frame 486 | Mennen, Johannes Henricus; Tjioe, Tjay Tjien | 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.
What's changing
Note
The 138 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
3
later US patents cite this one
That is below the median of utility patents granted in 2011 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.