Solid Fuel
US 8,801,812 Lapsed on the fee recordLapsed Aug 12, 2026 on the fee record · High confidence
20-year base term ends Oct 20, 2030
Third maintenance fee unpaid; grace period ended.
Oct 20, 2010
Aug 12, 2026
Aug 12, 2014
Feb 28, 2031
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Oct 20, 2010, when the earliest non-provisional application in its chain was filed (this one was filed Sep 20, 2012) | Oct 20, 2030 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +131 days, USPTO patent term adjustment record | Feb 28, 2031 | 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 | 2 of 3 maintenance fees paid | lapsed Aug 12, 2026 | High confidence |
| Computed term end | The steps above, in order | Aug 12, 2026 | High confidence |
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.
Not on this page: the patent's family, its recorded assignments and its citation count. USPTO's assignment records, linked above, list every recorded assignment.
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.