Patent US2439052A successfully refreshed from Google Patents.
US2439052A
Expired / Lapsed
US
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Shutoff valve mechanism
Assignee: Imperial Brass Manufacturing Co
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Filing: 1943-08-26
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Granted: 1948-04-06
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Expires: 1963-08-26
Abstract
No abstract record available.
Inventors
- 👤 Robert D Mcintosh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:40
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189812426A
Cited
US1603593A
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US1718530A
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US2009433A
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US1959259A
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US2007569A
Cited
US1992902A
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US2048858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |