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US2474146A
Expired / Lapsed
US
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Electric pressure head
Assignee: Individual
•
Filing: 1946-07-31
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Granted: 1949-06-21
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Expires: 1966-07-31
Abstract
No abstract record available.
Inventors
- 👤 Claude M Hathaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:46
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/08; G01L23/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2420148A
Cited
US2421907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |