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US2705779A
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US
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Attenuator units for waveguides
Assignee: POLYTECHNIC INST
•
Filing: 1952-03-18
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Granted: 1955-04-05
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Expires: 1972-03-18
Abstract
No abstract record available.
Inventors
- 👤 Weber Ernst
- 👤 Ebert John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:09
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/22; H01P1/222
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2600466A
Cited
US2505557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-04 | 1958-10-04 | 1959-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-04 | 1962-10-04 | 1963-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-04 | 1966-10-04 | 1967-04-05 | $7700.00 | Window Closed / Lapsed |