Vertical power transistor with thin bottom emitter layer and dopants implanted in trenches in shield area and termination rings
US 9,825,128 Lapsed on the fee recordLapsed Nov 21, 2021 on the fee record · From the USPTO record
20-year base term ends Sep 8, 2036
First maintenance fee unpaid; grace period ended.
Sep 8, 2016
Nov 21, 2021
Nov 21, 2017
Sep 8, 2036
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Sep 8, 2016, when this application, 15/259,877, was filed | Sep 8, 2036 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | No term adjustment record on a grant after 2005, so none is added | no change | Medium confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 3 maintenance fees paid | lapsed Nov 21, 2021 | High confidence |
| Computed term end | The steps above, in order | Nov 21, 2021 | 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.