Keyless deadbolt lock engaging device
US 6,601,420 Surrendered on reissueSurrendered on reissue Apr 1, 2008 · From the USPTO record
20-year base term ended Oct 31, 2016
Surrendered on reissue Apr 1, 2008 · its term and maintenance fees continue in US RE40,193.
Oct 31, 1996
Apr 1, 2008
Aug 5, 2003
Oct 31, 2016
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Oct 31, 1996, when the earliest non-provisional application in its chain was filed (this one was filed Sep 29, 1998) | Oct 31, 2016 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium 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 RE40,193 issued Apr 1, 2008, and this patent's term continues in it (35 U.S.C. 251, 252) | surrendered Apr 1, 2008 | High confidence |
| Surrendered on reissue | The steps above, in order | Apr 1, 2008 | 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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. Related patents and pending applications may cover overlapping subject matter.