Patent US3234482A successfully refreshed from Google Patents.
US3234482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized ultrasonic amplifier
Assignee: AT&T Inc
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Filing: 1963-04-23
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Granted: 1966-02-08
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Expires: 1983-04-23
Abstract
No abstract record available.
Inventors
- 👤 John H Rowen
- 👤 Donald L White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:34
CPC Classifications
H; H03; H03F; H03F13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
AN ULTRASONIC AMPLIFIER COMPRISING A PIEZOELECTRIC SEMICONDUCTIVE BODY, MEANS FOR PROPAGATING AN ULTRASONIC WAVE THROUGH SAID BODY, MEANS FOR IMPRESSING A DIRECT-CURRENT VOLTAGE ACROSS SAID BODY IN A DIRECTION PARALLEL TO SAID ULTRASONIC WAVE PROPAGATION, SAID BODY HAVING AT LEAST TWO PORTIONS OF DIFFERENT RESISTIVITY, THE RESISTIVITY IN ONE PORTION BEING THAT FOR WHICH CURRENT CARRIERS IN SAID MATERIAL DRIFT UNDER THE INFLUENCE OF SAID VOLTAGE AT A VELOCITY SUBSTANTIALLY EQUAL TO THE VELOCITY OF SAID ULTRASONIC WAVE PROPAGATION.
Claim 2
Dependent Claim
79 words
AN ULTRASONIC AMPLIFIER COMPRISING A PIEZOELECTRIC SEMICONDUCTIVE BODY, MEANS FOR PROPAGATING AN ULTRASONIC WAVE THROUGH SAID BODY, MEANS FOR IMPRESSING A DIRECT-CURRENT VOLTAGE ACROSS SAID BODY IN A DIRECTION PARALLEL TO SAID ULTRASONIC WAVE PROPAGATION, SAID BODY HAVING AT LEAST TWO PORTIONS OF DIFFERENT RESISTIVITY, THE RESISTIVITY IN ONE PORTION BEING THAT FOR WHICH CURRENT CARRIERS IN SAID MATERIAL DRIFT UNDER THE INFLUENCE OF SAID VOLTAGE AT A VELOCITY SUBSTANTIALLY EQUAL TO THE VELOCITY OF SAID ULTRASONIC WAVE PROPAGATION.
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) | 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 |