US3145354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit element
Assignee: AT&T Inc
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Filing: 1960-04-20
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Granted: 1964-08-18
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Expires: 1980-04-20
Abstract
No abstract record available.
Inventors
- 👤 Andrew R Hutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:36
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03C; H03C1/00; H03C1/34; H03H9/38; H03H9/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A CIRCUIT ELEMENT COMPRISING IN SUCCESSION A FIRST PIEZOELECTRIC TRANSDUCER, A CONDUCTIVITY MODUABLE PIEZOELECTRIC ULTRASONIC TRANSMITTING ELEMENT OF A MATERIAL HAVING A MAXIMUM ROOM TEMPERATURE RESISTIVITY OF 10**12 OHM-CM., THE RESISTIVITY OF THE SAID MATERIAL BEING IN PART DEPENDENT UPON THE AMOUNT OF RADIATION IMPINGING THEREON, AND A SECOND PIEZOELECTRIC T RANSDUCER SO ARRANGED THAT AN ELECTRIC FIELD APPLIED ACROSS THE SAID FIRST PIEZOELECTRIC TRANSDUCER RESULTS IN AN ULTRASONIC SIGNAL WHICH IS TRANSMITTED THROUGH THE SAID ULTRASONIC TRANSMITTING ELEMENT AND INTO THE SECOND PIEZOELECTRIC TRANSDUCER, SO RESULTING IN AN ELECTRICAL FIELD ACROSS THE SAID SECOND TRANSDUCER, AND IN WHICH THE DIRECTION OF ULTRASONIC PROPAGATION THROUGH THE SAID ULTRASONIC ELEMENT IS SUCH AS TO RESULT IN A PIEZOELECTRIC FIELD IN THAT ELEMENT TOGETHER WITH MEANS FOR VARYING THE ILLUMINATION INCIDENT ON A SURFACE OF THE SAID ULTRASONIC TRANSMITTING ELEMENT IN SUCH MANNER AS TO VARY THE ELECTRICAL RESISTIVITY, THE VARIATION IN ELECTRICAL RESISTIVITY RESULTING IN AN ATTENDANT CHANGE IN THE VELOCITY OF PROPAGATION OF AN ULTRASONIC WAVE THROUGH THE SAID ULTRASONIC ELEMENT.
Claim 2
Dependent Claim
171 words
A CIRCUIT ELEMENT COMPRISING IN SUCCESSION A FIRST PIEZOELECTRIC TRANSDUCER, A CONDUCTIVITY MODUABLE PIEZOELECTRIC ULTRASONIC TRANSMITTING ELEMENT OF A MATERIAL HAVING A MAXIMUM ROOM TEMPERATURE RESISTIVITY OF 10**12 OHM-CM., THE RESISTIVITY OF THE SAID MATERIAL BEING IN PART DEPENDENT UPON THE AMOUNT OF RADIATION IMPINGING THEREON, AND A SECOND PIEZOELECTRIC T RANSDUCER SO ARRANGED THAT AN ELECTRIC FIELD APPLIED ACROSS THE SAID FIRST PIEZOELECTRIC TRANSDUCER RESULTS IN AN ULTRASONIC SIGNAL WHICH IS TRANSMITTED THROUGH THE SAID ULTRASONIC TRANSMITTING ELEMENT AND INTO THE SECOND PIEZOELECTRIC TRANSDUCER, SO RESULTING IN AN ELECTRICAL FIELD ACROSS THE SAID SECOND TRANSDUCER, AND IN WHICH THE DIRECTION OF ULTRASONIC PROPAGATION THROUGH THE SAID ULTRASONIC ELEMENT IS SUCH AS TO RESULT IN A PIEZOELECTRIC FIELD IN THAT ELEMENT TOGETHER WITH MEANS FOR VARYING THE ILLUMINATION INCIDENT ON A SURFACE OF THE SAID ULTRASONIC TRANSMITTING ELEMENT IN SUCH MANNER AS TO VARY THE ELECTRICAL RESISTIVITY, THE VARIATION IN ELECTRICAL RESISTIVITY RESULTING IN AN ATTENDANT CHANGE IN THE VELOCITY OF PROPAGATION OF AN ULTRASONIC WAVE THROUGH THE SAID ULTRASONIC ELEMENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |