Patent US2551225A successfully refreshed from Google Patents.
US2551225A
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US
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Cold cathode tube and circuits for the use thereof
Assignee: EDI HOLDING Inc
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Filing: 1949-02-01
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Granted: 1951-05-01
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Expires: 1969-02-01
Abstract
No abstract record available.
Inventors
- 👤 Edward D Spierer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:42
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/241; G01F23/243; G05; G05D; G05D27/00; G05D27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1998132A
Cited
US1977353A
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US2049355A
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US2039449A
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US2103439A
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US2202197A
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US2371981A
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US2473832A
Cited
US2429451A
Cited
US2473237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |