Electrical Power Multiplication
US 9,513,652 Lapsed on the fee recordLapsed Dec 6, 2020 on the fee record · High confidence
20-year base term ended Feb 18, 2025
First maintenance fee unpaid; grace period ended.
Feb 18, 2005
Dec 6, 2020
Dec 6, 2016
Jul 23, 2025
How we calculated this date
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Feb 18, 2005, when the earliest non-provisional application in its chain was filed (this one was filed Dec 18, 2013) | Feb 18, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +155 days, USPTO patent term adjustment record | Jul 23, 2025 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,629,734, US 8,638,182, US 9,513,652) | resolves to Jul 23, 2025, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 2 maintenance fees paid | lapsed Dec 6, 2020 | High confidence |
| Computed term end | The steps above, in order | Dec 6, 2020 | 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.