Patent US3057425A successfully refreshed from Google Patents.
US3057425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-propelled electric wheelchair
Assignee: Individual
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Filing: 1961-04-28
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Granted: 1962-10-09
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Expires: 1981-04-28
Abstract
No abstract record available.
Inventors
- 👤 Milton A Proett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:44
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/04; A61G5/041; A61G5/045; A61G5/10; A61G5/1051; A61G5/1078
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |