US2687145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot controlled pressure and vacuum operated pneumatic valve
Assignee: Individual
•
Filing: 1952-02-15
•
Granted: 1954-08-24
•
Expires: 1972-02-15
Abstract
No abstract record available.
Inventors
- 👤 Clarence F Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:40
CPC Classifications
B; B65; B65B; B65B1/00; B65B1/30; B65B1/40; B65B1/42; Y; Y10; Y10S; Y10S261/00; Y10S261/56; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/87499
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1873138A
Cited
US1924425A
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US2353143A
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US2371434A
Cited
US2564198A
Cited
US2470744A
Cited
GB617183A
Cited
CH258092A
Cited
US2575240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |