US2588292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron switching tubes and circuits therefor
Assignee: Philips Laboratories Inc
•
Filing: 1950-04-20
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Granted: 1952-03-04
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Expires: 1970-04-20
Abstract
No abstract record available.
Inventors
- 👤 Edmund S Rittner
- 👤 Frank E Grace
- 👤 George A Beutel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:46
CPC Classifications
H; H03; H03F; H03F5/00; H01; H01J; H01J31/00; H01J31/02; H01J31/04; H03C; H03C1/00; H03C1/36; H03F3/00; H03F3/26; H03F3/28; H10; H10P; H10P95/00; Y; Y10; Y10S; Y10S313/00; Y10S313/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2153163A
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US2544754A
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US2527652A
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US2527632A
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US2544753A
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US2544755A
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US2540490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |