Low-Cost Solar Cells and Methods for Their Production
US 7,956,283 Lapsed on the fee recordLapsed Jun 7, 2023 on the fee record · High confidence
20-year base term ends Nov 7, 2028
Third maintenance fee unpaid; grace period ended.
Nov 7, 2008
Jun 7, 2023
Jun 7, 2011
Apr 1, 2029
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Nov 7, 2008, when this application, 12/267,528, was filed | Nov 7, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +145 days, USPTO patent term adjustment record | Apr 1, 2029 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 7,960,644) | resolves to Apr 1, 2029, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | lapsed Jun 7, 2023 | High confidence |
| Computed term end | The steps above, in order | Jun 7, 2023 | High 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.