Patent US2818910A successfully refreshed from Google Patents.
US2818910A
Expired / Lapsed
US
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Tightener for folding wheel chair
Assignee: Individual
•
Filing: 1955-11-18
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Granted: 1958-01-07
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Expires: 1975-11-18
Abstract
No abstract record available.
Inventors
- 👤 Hawkins Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:46
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/10; A61G5/08; A61G5/0808; A61G5/0816; A61G5/0825; F; F16; F16G; F16G11/00; F16G11/12; Y; Y10; Y10S; Y10S297/00; Y10S297/04
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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |