Patent US3870612A successfully refreshed from Google Patents.
Patent US2537388A successfully refreshed from Google Patents.
US2537388A
Expired / Lapsed
US
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Beam amplifier
Assignee: AT&T Inc
•
Filing: 1947-05-14
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Granted: 1951-01-09
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Expires: 1967-05-14
Abstract
No abstract record available.
Inventors
- 👤 Dean E Wooldridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:00
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/26; H01J31/28; G; G01; G01R; G01R1/00; G01R1/30; G01T; G01T1/00; G01T1/16; G01T1/26; H01B; H01B19/00; H01B19/04; H03; H03F; H03F17/00; Y; Y10; Y10S; Y10S313/00; Y10S313/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1659636A
Cited
US2129710A
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US2289978A
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US2407320A
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US2430570A
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US2445305A
Cited
US2472365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |