US3234488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light modulable circuit element
Assignee: AT&T Inc
•
Filing: 1960-09-12
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Granted: 1966-02-08
•
Expires: 1980-09-12
Abstract
No abstract record available.
Inventors
- 👤 Irvin E Fair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:37
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A VARIABLE ULTRASONIC DELAY LINE WHICH COMPRISES A PAIR OF PIEZOELECTRIC TRANSDUCERS, A PIEZOELECTRIC, PHOTOCONDUCTIVE MEDIUM ARRANGED BETWEEN SAID PAIR OF TRANSDUCERS SO THAT AN ELECTRIC FIELD APPLIED ACROSS A FIRST OF SAID PAIR OF TRANSDUCERS, RESULTING IN A FIELD IN SAID SECIS TRANSMITTED THROUGH SAID MEDIUM INTO THE SECOND OF SAID PAIR OF TRANSDUCERS, RESULTING IN A FIELD IN SAID SEC OND TRANSDUCER, SAID ACOUSTIC SIGNAL INITIATING A PIEZOELECTRIC FIELD IN SAID MEDIUM, AND MEANS FOR VARYING THE VELOCITY OF SAID ACOUSTIC SIGNAL THROUGH SAID MEDIUM WHICH FURTHER COMPRISES VARIABLE ILLUMINATING MEANS ASSOCIATED WITH SAID ELEMENT ADAPTED TO ILLUMINATE A VARYING PORTION OF ITS SURFACE, SAID ILLUMINATING MEANS HAVING A LIGHT INTENSITY SUFFICIENT TO PROVIDE SUBSTANTIALLY THE MAXIMUM PHOTOCONDUCTIVITY ATTAINABLE IN THE PORTION OF THE PHOTOCONDUCTIVE ELEMENT SO ILLUMINATED, AND MEANS FOR MAINTAINING THE REMAINING PORTION OF SAID ELEMENT AT A LIGHT INTENSITY BELOW THAT AT WHICH ANY SIGNIFICANT DEGREE OF PHOTOCONDUCTIVITY OCCURS IN SAID PORTION SO THAT THE
Claim 2
Dependent Claim
160 words
A VARIABLE ULTRASONIC DELAY LINE WHICH COMPRISES A PAIR OF PIEZOELECTRIC TRANSDUCERS, A PIEZOELECTRIC, PHOTOCONDUCTIVE MEDIUM ARRANGED BETWEEN SAID PAIR OF TRANSDUCERS SO THAT AN ELECTRIC FIELD APPLIED ACROSS A FIRST OF SAID PAIR OF TRANSDUCERS, RESULTING IN A FIELD IN SAID SECIS TRANSMITTED THROUGH SAID MEDIUM INTO THE SECOND OF SAID PAIR OF TRANSDUCERS, RESULTING IN A FIELD IN SAID SEC OND TRANSDUCER, SAID ACOUSTIC SIGNAL INITIATING A PIEZOELECTRIC FIELD IN SAID MEDIUM, AND MEANS FOR VARYING THE VELOCITY OF SAID ACOUSTIC SIGNAL THROUGH SAID MEDIUM WHICH FURTHER COMPRISES VARIABLE ILLUMINATING MEANS ASSOCIATED WITH SAID ELEMENT ADAPTED TO ILLUMINATE A VARYING PORTION OF ITS SURFACE, SAID ILLUMINATING MEANS HAVING A LIGHT INTENSITY SUFFICIENT TO PROVIDE SUBSTANTIALLY THE MAXIMUM PHOTOCONDUCTIVITY ATTAINABLE IN THE PORTION OF THE PHOTOCONDUCTIVE ELEMENT SO ILLUMINATED, AND MEANS FOR MAINTAINING THE REMAINING PORTION OF SAID ELEMENT AT A LIGHT INTENSITY BELOW THAT AT WHICH ANY SIGNIFICANT DEGREE OF PHOTOCONDUCTIVITY OCCURS IN SAID PORTION SO THAT THE
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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) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |