US2769457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined venting and overpressure release valve
Assignee: National Presto Industries Inc
•
Filing: 1953-06-01
•
Granted: 1956-11-06
•
Expires: 1973-06-01
Abstract
No abstract record available.
Inventors
- 👤 Edward H Wittenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:21
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/08; A47J27/09; F; F16; F16K; F16K15/00; F16K15/14; F16K15/148; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7847; Y10T137/7848; Y10T137/7869; Y10T137/7871; Y10T137/7879; Y10T137/7888; Y10T137/789; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7921
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US751667A
Cited
US727244A
Cited
US943951A
Cited
US1032032A
Cited
US1997365A
Cited
US2619982A
Cited
US2702046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |