US2162671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air valve
Assignee: John B. Pierce Laboratory
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Filing: 1937-02-13
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Granted: 1939-06-13
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Expires: 1957-02-13
Abstract
No abstract record available.
Inventors
- 👤 William C Groeniger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:14
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/108; E03C1/104; F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/035; F16K17/00; F16K17/02; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/3331; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7846; Y10T137/7898; Y10T137/7901; Y10T137/7903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-06-12 | 1942-12-12 | 1943-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-06-12 | 1946-12-12 | 1947-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-06-12 | 1950-12-12 | 1951-06-13 | $7700.00 | Window Closed / Lapsed |