Patent US1667154A successfully refreshed from Google Patents.
US1667154A
Expired / Lapsed
US
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Safety valve
Assignee: Individual
•
Filing: 1926-04-28
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Granted: 1928-04-24
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Expires: 1946-04-28
Abstract
No abstract record available.
Inventors
- 👤 Charles F Heywood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:13
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/22; F04B49/24; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2622; Y10T137/2637; Y10T137/7722; Y10T137/7781; Y10T137/7832; Y10T137/7835; Y10T137/7836; Y10T137/7837; Y10T137/7838
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) | 1931-04-24 | 1931-10-24 | 1932-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-04-24 | 1935-10-24 | 1936-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-04-24 | 1939-10-24 | 1940-04-24 | $7700.00 | Window Closed / Lapsed |