Patent US2509880A successfully refreshed from Google Patents.
US2509880A
Expired / Lapsed
US
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Air pressure mechanism
Assignee: Individual
•
Filing: 1948-05-04
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Granted: 1950-05-30
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Expires: 1968-05-04
Abstract
No abstract record available.
Inventors
- 👤 Robert L Pelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:12
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/16; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K47/00; F16K47/01; F16K47/011; F16K47/0111; F16K2200/00; F16K2200/30; F16K2200/305; F16K2200/3053; Y; Y10; Y10S; Y10S55/00; Y10S55/17; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3102; Y10T137/3105; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/777; Y10T137/7781; Y10T137/7832; Y10T137/7835; Y10T137/7837; Y10T137/785; Y10T137/7852; Y10T137/7853; Y10T137/8593; Y10T137/87917; Y10T137/88062
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) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |