Collateral for a security interest recorded Jun 19, 2013 (Firstmerit Bank, N.A.).
Term ends Dec 11, 2027 · Medium confidence
20-year base term ended Oct 4, 2026
Why Medium: A parent in the chain could not be resolved.
Filed Dec 26, 2008 as application 12/317,610 · Granted Feb 21, 2012
Base term plus 433 days of patent term adjustment (USPTO delay)
Today
2006
2027
Clock starts
Oct 4, 2006
Oct 4, 2006
Term ends
Dec 11, 2027
Dec 11, 2027
Granted
Feb 21, 2012
Feb 21, 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
433
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.
6
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 433 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Oct 4, 2006, when application 11/538,746, the earliest non-provisional in its chain, was filed (this one was filed Dec 26, 2008); a parent in its chain could not be resolved (the next row) | Oct 4, 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 | +433 days, USPTO patent term adjustment record | Dec 11, 2027 | 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 | Dec 11, 2027 | Medium confidence |
This family
| US 8,318,062 | In force Dec 2031 | Dec 2031 |
| Application 11/789,187 | Abandoned not computed | not computed |
| Application PCT/US2007/079896 | PCT application no patent term | no patent term |
| Application PCT/US2007/079908 | PCT application no patent term | no patent term |
| US 8,118,177 | this patent Dec 2027 | Dec 2027 |
| US 8,973,762 | Term ended Oct 2026 | Oct 2026 |
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 3, 2009 Reel 22337, frame 391 | Drapela, David C.; Sellars, William R.; Shutt, Thomas C.; Sellars, John C. | Sellars Absorbent Materials, Inc. | Assignment of Assignor's Interest |
| Feb 14, 2011 Reel 25783, frame 923 | Sellars Absorbent Materials, Inc. | Wisconsin Note Investors, LLC | Patent Security Agreement |
| Jan 3, 2012 Reel 27468, frame 957 | Wisconsin Note Investors, LLC | Sellars Absorbent Materials, Inc. | Release of Security Interest |
| Jun 19, 2013 Reel 30657, frame 571 | Sellars Absorbent Materials, Inc. | Firstmerit Bank, N.a. | Security Agreement |
| Jun 20, 2013 Reel 30663, frame 753 | Sellars Absorbent Materials, Inc. | Spell Capital Mezzanine Partners SBIC, LP | Security Agreement |
| Jun 21, 2013 Reel 30666, frame 364 | Sellars Absorbent Materials, Inc. | Spell Capital Mezzanine Partners SBIC, LP | Security Agreement |
| Jul 18, 2016 Reel 39375, frame 958 | Spell Capital Mezzanine Partners SBIC, LP | Sellars Absorbent Materials, Inc. | Release of Security Interest |
| Jul 18, 2016 Reel 39376, frame 903 | Spell Capital Mezzanine Partners SBIC, LP | Sellars Mezz Debt Investors, LLC | Change of Collateral Agent |
| Jan 23, 2020 Reel 51684, frame 141 | Sellars Absorbent Materials, Inc. | The Huntington National Bank | Security Interest |
| Mar 23, 2020 Reel 52207, frame 803 | Sellars Absorbent Materials, Inc. | Sellars Mezz Debt Investors, LLC | Amended and Restated Intellectual Property Security Agreement |
| May 7, 2021 Reel 56173, frame 220 | Sellars Mezz Debt Investors, LLC | Sellars Absorbent Materials, Inc. | Release of Security Interest |
| Jul 28, 2026 Reel 75416, frame 822 | Sellars Absorbent Materials, Inc. | The Huntington National Bank | 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
Dec 2027
Term ends Dec 11, 2027. No further fees fall due before then
Note
The 433 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
115
later US patents cite this one
That is top 5% 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.