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US 9,471,661 Surrendered on reissueSurrendered on reissue May 31, 2022 · From the USPTO record
20-year base term ended Nov 5, 2024
Surrendered on reissue May 31, 2022 · its term and maintenance fees continue in US RE49,090.
Nov 5, 2004
May 31, 2022
Oct 18, 2016
Jan 25, 2025
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Nov 5, 2004, when the earliest non-provisional application in its chain was filed (this one was filed May 13, 2013) | Nov 5, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +81 days, USPTO patent term adjustment record | Jan 25, 2025 | 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 | No fee event states this; the fee state is read from the payments the fee record holds | no change | Medium confidence |
| Reissue | US RE49,090 issued May 31, 2022, and this patent's term continues in it (35 U.S.C. 251, 252) | surrendered May 31, 2022 | High confidence |
| Surrendered on reissue | The steps above, in order | May 31, 2022 | From the USPTO record |
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.