Wastewater Treatment Method and Apparatus
US 8,882,997 Term endedTerm ended Apr 8, 2024 · Medium confidence
20-year base term ended Apr 8, 2024
Why Medium: The disclaimer's references carry disclaimers of their own not yet read (US 8,419,935), so the cap could be lower.
Apr 8, 2004
Apr 8, 2024
Nov 11, 2014
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Apr 8, 2004, when the earliest non-provisional application in its chain was filed (this one was filed Mar 11, 2011) | Apr 8, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +682 days, USPTO patent term adjustment record | Feb 19, 2026 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 7,291,267, US 8,419,935, US 8,557,116) | capped to Apr 8, 2024 | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | term ended | High confidence |
| Computed term end | The steps above, in order | Apr 8, 2024 | Medium 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.