Patent US3283264A successfully refreshed from Google Patents.
US3283264A
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Frequency selective system
Assignee: AT&T Inc
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Filing: 1963-12-24
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Granted: 1966-11-01
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Expires: 1983-12-24
Abstract
No abstract record available.
Inventors
- 👤 Emmanuel P Papadakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:17
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/40; E; E04; E04H; E04H12/00; E04H12/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A FREQUENCY SELECTIVE SYSTEM COMPRISING A PROPAGATION MEDIUM FOR ULTRASONIC WAVE ENERGY IN A GIVEN FREQUENCY BAND, AN ULTRASONIC DIFFRACTION GRATING ASSOCIATED WITH SAID MEDIUM, SAID GRATING EXTENDING IN A GIVEN PLANE FOR A LENGTH OF AT LEAST A PLURALITY OF WAVELENGTHS OF ENERGY IN SAID BAND, MEANS FOR LAUNCHING A PREDOMINANT BEAM OF ULTRASONIC WAVE IN SAID MEDIUM DIRECTED PARALLEL TO SAID GIVEN PLANE AND THEREFORE AT GRAZING INCIDENCE TO SAID GRATING WHEREBY ENERGY IN SAID GIVEN BAND IS DIFFRACTED BY SAID GRATING AS A BROAD WAVE FRONT MOVING IN A GIVEN DIRECTION, AND A PIEZOELECTRIC TRANSDUCER FOR CONVERTING ULTRASONIC WAVE ENERGY INTO ELECTRICAL SIGNALS, SAID TRANSDUCER HAVING THE PIEZOELECTRIC FACE THEREOF OF LENGTH EXTENDING IN A GIVEN PLANE FOR A PLURALITY OF WAVELENGTHS OF SAID ENERGY IN SAID BAND IN A DIRECTION SUBSTANTIALLY NORMAL TO SAID GIVEN DIRECTION.
Claim 2
Dependent Claim
140 words
A FREQUENCY SELECTIVE SYSTEM COMPRISING A PROPAGATION MEDIUM FOR ULTRASONIC WAVE ENERGY IN A GIVEN FREQUENCY BAND, AN ULTRASONIC DIFFRACTION GRATING ASSOCIATED WITH SAID MEDIUM, SAID GRATING EXTENDING IN A GIVEN PLANE FOR A LENGTH OF AT LEAST A PLURALITY OF WAVELENGTHS OF ENERGY IN SAID BAND, MEANS FOR LAUNCHING A PREDOMINANT BEAM OF ULTRASONIC WAVE IN SAID MEDIUM DIRECTED PARALLEL TO SAID GIVEN PLANE AND THEREFORE AT GRAZING INCIDENCE TO SAID GRATING WHEREBY ENERGY IN SAID GIVEN BAND IS DIFFRACTED BY SAID GRATING AS A BROAD WAVE FRONT MOVING IN A GIVEN DIRECTION, AND A PIEZOELECTRIC TRANSDUCER FOR CONVERTING ULTRASONIC WAVE ENERGY INTO ELECTRICAL SIGNALS, SAID TRANSDUCER HAVING THE PIEZOELECTRIC FACE THEREOF OF LENGTH EXTENDING IN A GIVEN PLANE FOR A PLURALITY OF WAVELENGTHS OF SAID ENERGY IN SAID BAND IN A DIRECTION SUBSTANTIALLY NORMAL TO SAID GIVEN DIRECTION.
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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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |