Also listed on Sunoco, Inc. (R&M), an earlier holder on the record. The recorded assignments below show how it moved.
Term ends May 30, 2027 · High confidence
20-year base term ends May 30, 2027
Held by Braskem America, Inc.
Filed May 30, 2007 as application 11/809,114 · Granted Dec 16, 2008
Base term, 20 years from filing
Today
2007
2027
Clock starts
May 30, 2007
May 30, 2007
Term ends
May 30, 2027
May 30, 2027
Granted
Dec 16, 2008
Dec 16, 2008
base term
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.
This patent's term is its 20-year base term, with no adjustment for 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 May 30, 2007, when this application, 11/809,114, was filed | May 30, 2027 | 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 | In force | High confidence |
| Computed term end | The steps above, in order | May 30, 2027 | High confidence |
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 |
|---|---|---|---|
| Nov 23, 2008 Reel 21879, frame 663 | Stanford University | National Institutes of Health (Nih), U.S. Dept. of Health and Human Services (DHHS), U.S. Government | Confirmatory License |
| Dec 11, 2008 Reel 21963, frame 548 | Meverden, Craig C.; Schnitgen, Andrew L.; Kim, Sehyun | Sunoco, Inc. (R&M) | Assignment of Assignor's Interest |
| Nov 17, 2010 Reel 25379, frame 866 | Sunoco, Inc. (R&M) | Sunoco Chemicals, Inc. | Assignment of Assignor's Interest |
| Nov 17, 2010 Reel 25379, frame 895 | Sunoco Chemicals, Inc. | Braskem PP Americas, Inc. | Change of Name |
| Jan 10, 2011 Reel 25604, frame 572 | Braskem PP Americas, Inc. | Braskem America, Inc. | 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.
What's changing
May 2027
Term ends May 30, 2027. No further fees fall due before then
Citations
13
later US patents cite this one
That is above the median of utility patents granted in 2008 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.