US2738796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined vent and pressure relief valve unit
Assignee: Individual
•
Filing: 1952-08-11
•
Granted: 1956-03-20
•
Expires: 1972-08-11
Abstract
No abstract record available.
Inventors
- 👤 Earl L Chadwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:46
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/18; F16K17/19; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0874; Y10T137/0898; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7842; Y10T137/8593; Y10T137/86292; Y10T137/86324; Y10T137/87917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |