Molecular Separator
US 8,591,739 Lapsed on the fee recordLapsed Nov 26, 2025 on the fee record · High confidence
20-year base term ended Apr 8, 2024
Third maintenance fee unpaid; grace period ended.
Apr 8, 2004
Nov 26, 2025
Nov 26, 2013
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 Sep 27, 2007) | Apr 8, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +866 days, USPTO patent term adjustment record | Aug 22, 2026 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 7,291,267, US 7,459,091, US 8,012,355, US 8,557,116) | capped to May 11, 2025 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | lapsed Nov 26, 2025 | High confidence |
| Computed term end | The steps above, in order | Nov 26, 2025 | 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.