Patent US2569987A successfully refreshed from Google Patents.
US2569987A
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US
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Pressure responsive transducer
Assignee: Cambridge Thermionic Corp
•
Filing: 1948-10-01
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Granted: 1951-10-02
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Expires: 1968-10-01
Abstract
No abstract record available.
Inventors
- 👤 Frondel Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:34
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/08; G01L23/10; Y; Y10; Y10S; Y10S73/00; Y10S73/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2384465A
Cited
US1121986A
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US1495429A
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US1766042A
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US1939302A
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US2374637A
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US2447333A
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US2427348A
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US2433383A
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US2402531A
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US2456294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |