US2715437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot operated safety valve for heat
Assignee: —
•
Filing: —
•
Granted: 1955-08-16
•
Expires: 1972-08-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:58
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/10; F23N1/00; F23N1/005; F23N1/007; G; G05; G05D; G05D23/00; G05D23/01; G05D23/02; F23N2227/00; F23N2227/22; F23N2235/00; F23N2235/12; F23N2235/14; F23N2235/18; F23N2235/20; F23N2235/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-08-15 | 1959-02-14 | 1959-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-15 | 1963-02-14 | 1963-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-15 | 1967-02-14 | 1967-08-16 | $7700.00 | Window Closed / Lapsed |