Systems and Methods for State-Less Authentication
US 7,020,645 Surrendered on reissueSurrendered on reissue Aug 15, 2017 · Low confidence
20-year base term ended Apr 19, 2021
Surrendered on reissue Aug 15, 2017 · its term and maintenance fees continue in US RE46,513.
Apr 19, 2001
Aug 15, 2017
Mar 28, 2006
Nov 20, 2022
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Apr 19, 2001, when this application, 09/839,551, was filed | Apr 19, 2021 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +580 days, USPTO patent term adjustment record | Nov 20, 2022 | 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; the fee record shows no payment for this window, and USPTO's status still reads "Patented Case" | no change | Low confidence |
| Reissue | US RE46,513 issued Aug 15, 2017, and this patent's term continues in it (35 U.S.C. 251, 252) | surrendered Aug 15, 2017 | High confidence |
| Surrendered on reissue | The steps above, in order | Aug 15, 2017 | Low 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.