Term ends Oct 28, 2030 · High confidence
20-year base term ends Jun 20, 2028
Held by Olin Corporation
Filed Jun 20, 2008 as application 12/143,695 · Granted Sep 4, 2012
Base term plus 860 days of patent term adjustment (USPTO delay)
Today
2008
2030
Clock starts
Jun 20, 2008
Jun 20, 2008
Term ends
Oct 28, 2030
Oct 28, 2030
Granted
Sep 4, 2012
Sep 4, 2012
base term
patent term adjustment
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
860
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.
3
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 860 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 Jun 20, 2008, when this application, 12/143,695, was filed | Jun 20, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +860 days, USPTO patent term adjustment record | Oct 28, 2030 | 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 | Oct 28, 2030 | High confidence |
This family
| US 8,256,352 | this patent Oct 2030 | Oct 2030 |
| Application PCT/US2009/036215 | PCT application no patent term | no patent term |
| US 8,646,389 | In force Jun 2028 | Jun 2028 |
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 |
|---|---|---|---|
| Sep 3, 2008 Reel 21475, frame 364 | Masinelli, Kyle A. | Olin Corporation | Assignment of Assignor's Interest |
| Aug 7, 2020 Reel 53436, frame 262 | Olin Corporation | Bank Of America, N.a. | Security Agreement |
| Jul 29, 2021 Reel 57016, frame 561 | Bank Of America, N.a. | Olin Corporation | Release of Security Interest |
| May 19, 2026 Reel 74694, frame 881 | Olin Corporation; Olin Winchester, LLC | Bank of America, N.A., as Administrative Agent and Collateral May 19, 2026 | Security 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Oct 2030
Term ends Oct 28, 2030. No further fees fall due before then
Note
The 860 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
36
later US patents cite this one
That is top 25% of utility patents granted in 2012 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.