Control Method and Circuit with Indirect Input Voltage Detection by Switching Current Slope Detection
US 7,616,461 Surrendered on reissueSurrendered on reissue Sep 6, 2011 · Medium confidence
20-year base term ends Jan 12, 2027
Why Medium: No fee event states this; the fee state is read from the payments the fee record holds.
Surrendered on reissue Sep 6, 2011 · its term and maintenance fees continue in US RE42,674.
Jan 12, 2007
Sep 6, 2011
Nov 10, 2009
Nov 20, 2027
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Jan 12, 2007, when this application, 11/652,578, was filed | Jan 12, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +312 days, USPTO patent term adjustment record | Nov 20, 2027 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 7,656,685) | resolves to Nov 20, 2027, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | No fee events in USPTO's record of this patent. A gap in the record, not evidence of lapse | no change | Medium confidence |
| Reissue | US RE42,674 issued Sep 6, 2011, and this patent's term continues in it (35 U.S.C. 251, 252) | surrendered Sep 6, 2011 | High confidence |
| Surrendered on reissue | The steps above, in order | Sep 6, 2011 | 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.