Collateral for a security interest recorded May 19, 2026 (Bank of America, N.A.).
Term ends Apr 1, 2033 · High confidence
20-year base term ends Apr 1, 2033
Held by Olin Corporation
Filed Feb 1, 2016 as application 15/012,743 · Granted Mar 5, 2019
Base term, 20 years from filing
Today
2013
2033
Clock starts
Apr 1, 2013
Apr 1, 2013
Term ends
Apr 1, 2033
Apr 1, 2033
Granted
Mar 5, 2019
Mar 5, 2019
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.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 9,250,048, to Apr 1, 2033. The term already ends on or before that date, so the cap shortened nothing.
2 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.
2
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. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 2 of 3 maintenance fees are paid so far. 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 Apr 1, 2013, when application 13/854,931, the earliest non-provisional in its chain, was filed (this one was filed Feb 1, 2016) | Apr 1, 2033 | 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 | Disclaimer resolved from the filed document (refs US 9,250,048) | resolves to Apr 1, 2033, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 1, 2033 | High confidence |
This family
| US 9,250,048 | In force Apr 2033 | Apr 2033 |
| US 10,222,185 | this patent Apr 2033 | Apr 2033 |
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 |
|---|---|---|---|
| Feb 23, 2016 Reel 37798, frame 655 | Meyer, Stephen W. | 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
Apr 2033
Term ends Apr 1, 2033. Maintenance fees still fall due before then
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 9,250,048, ends no earlier than this term, so it caps nothing.
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2019 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.