US2821995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety valve
Assignee: Individual
•
Filing: 1954-09-14
•
Granted: 1958-02-04
•
Expires: 1974-09-14
Abstract
No abstract record available.
Inventors
- 👤 Lloyd E Semler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:48
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/20; F16K17/22; F16K17/24; F16K17/28; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US31799A
Cited
US116326A
Cited
US141986A
Cited
US752061A
Cited
GB189809056A
Cited
US813487A
Cited
US810746A
Cited
US1050646A
Cited
US1219978A
Cited
US2491104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |