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US2722661A
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High frequency attenuator
Assignee: GTE Sylvania Inc
•
Filing: 1947-12-23
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Granted: 1955-11-01
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Expires: 1967-12-23
Abstract
No abstract record available.
Inventors
- 👤 Richard M Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:10
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/22; H01P1/222
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2411534A
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US2430130A
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US2449182A
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US2409599A
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US2538771A
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US2531194A
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US2567210A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |