Patent US2440189A successfully refreshed from Google Patents.
US2440189A
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Convection current responsive instrument
Assignee: RCA Corp
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Filing: 1945-04-13
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Granted: 1948-04-20
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Expires: 1965-04-13
Abstract
No abstract record available.
Inventors
- 👤 Vladimir K Zworykin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:12
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/006; G01P15/008; G01R; G01R1/00; G01R1/30; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1261
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1335055A
Cited
DE357784C
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US1351356A
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GB243048A
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DE425059C
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US1822184A
Cited
US2014998A
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US2056769A
Cited
US2237077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |