US2472090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow-actuated valve
Assignee: Fischer and Porter Co
•
Filing: 1943-11-23
•
Granted: 1949-06-07
•
Expires: 1963-11-23
Abstract
No abstract record available.
Inventors
- 👤 Brewer Nathaniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:55
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0126; G05D7/0133; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/8158; Y10T137/8225; Y10T137/8275; Y10T137/8359
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR469821A
Cited
US1127645A
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US1470600A
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US1641944A
Cited
US2152695A
Cited
US2311853A
Cited
US2260516A
Cited
US2231158A
Cited
US2347344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |