US2581290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge valve
Assignee: HPM Development Corp
•
Filing: 1947-07-08
•
Granted: 1952-01-01
•
Expires: 1967-07-08
Abstract
No abstract record available.
Inventors
- 👤 Howard M Purcell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:28
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/363; B; B30; B30B; B30B15/00; B30B15/16; B30B15/18; B30B15/183
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1684220A
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US1730322A
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US1768582A
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US1956758A
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US2103725A
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US2077894A
Cited
US2104390A
Cited
US2187371A
Cited
US2152837A
Cited
US2204270A
Cited
US2358650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |