Patent US2597867A successfully refreshed from Google Patents.
US2597867A
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US
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High-frequency attenuating device
Assignee: Unisys Corp
•
Filing: 1949-08-17
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Granted: 1952-05-27
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Expires: 1969-08-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:43
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/22; H01P1/225; H01P1/20; H01P1/201; H01P1/202; H01P1/222; H01P3/00; H01P3/02; H01P3/06; H01P5/00; H01P5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2151157A
Cited
US2433368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |