Patent US3221275A successfully refreshed from Google Patents.
US3221275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable directional coupler utilizing specially shaped coupling aperture, used as non-dissipative microwave attenuator
Assignee: ALFRED ELECTRONICS
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Filing: 1964-04-03
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Granted: 1965-11-30
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Expires: 1984-04-03
Abstract
No abstract record available.
Inventors
- 👤 Bernard A Wambsganss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:05
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A CONTINUOUSLY VARIABLE ATTENUATOR COMPRISING: A PAIR OF WAVE ENERGY TRANSMISSION LINES DISPOSED FOR RELATIVE LATERAL DISPLACEMENT WITH RESPECT TO ONE AN OTHER IN A SELECTED DIRECTION; AND COMMON APERTURE MEANS ASSOCIATED WITH SAID TRANSMISSION LINES BY WHICH WAVE ENERGY IS TRANSFERRED FROM ONE TRANSMISSION LINE TO THE OTHER IN ACCORDANCE WITH THE THEIR RELATIVE LATERAL POSITION, SAID APERTURE MEANS HAVING AN APERTURE WHICH INCREASES IN LENGTH IN SAID SELECTED DIRECTION.
Claim 2
Dependent Claim
71 words
A CONTINUOUSLY VARIABLE ATTENUATOR COMPRISING: A PAIR OF WAVE ENERGY TRANSMISSION LINES DISPOSED FOR RELATIVE LATERAL DISPLACEMENT WITH RESPECT TO ONE AN OTHER IN A SELECTED DIRECTION; AND COMMON APERTURE MEANS ASSOCIATED WITH SAID TRANSMISSION LINES BY WHICH WAVE ENERGY IS TRANSFERRED FROM ONE TRANSMISSION LINE TO THE OTHER IN ACCORDANCE WITH THE THEIR RELATIVE LATERAL POSITION, SAID APERTURE MEANS HAVING AN APERTURE WHICH INCREASES IN LENGTH IN SAID SELECTED DIRECTION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |