Patent US2442240A successfully refreshed from Google Patents.
US3173100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic wave amplifier
Assignee: AT&T Inc
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Filing: 1961-04-26
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Granted: 1965-03-09
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Expires: 1981-04-26
Abstract
No abstract record available.
Inventors
- 👤 Donald L White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:18
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/542; H01; H01B; H01B1/00; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/326; H03B9/00; H03B9/12; H03F; H03F13/00; H03H9/30; H03H9/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
AN ELECTROMECHANICAL DEVICE COMPRISING A UNITARY BODY HAVING BOTH PIEZOELECTRIC AND SEMICONDUCTOR PROPERTIES, MEANS FOR PROGAGTING AN ACOUSTIC WAVE SIGNAL THROUGH SAID BODY THEREBY GENERATING A SIGNIFICANT PIEZOELECTRIC FIELD, AND MEANS INCLUDING A D.C. BIAS SOURCE FOR SIMULTANEOUSLY ESTABLISHING A D.C. FIELD IN SAID BODY, SAID FIELD HAVING A MAGNITUDE AND DIRECTION SUCH THAT THE DRIFT VELOCITY OF THE CARRIERS RESPONSIVE TO SAID FIELD HAS A VELOCITY COMPONENT ALONG THE AXIS DEFINED BY THE DIRECTION OF SAID ACOUSTIC WAVE PROPAGATION WHEREBY THE CARRIERS OF SAID D.C. FIELD INTERACT WITH THE SAID ACOUSTIC WAVE IN A MANNER SO AS TO MODIFY THE AMPLITUDE OF THE ACOUSITC WAVE.
Claim 2
Dependent Claim
106 words
AN ELECTROMECHANICAL DEVICE COMPRISING A UNITARY BODY HAVING BOTH PIEZOELECTRIC AND SEMICONDUCTOR PROPERTIES, MEANS FOR PROGAGTING AN ACOUSTIC WAVE SIGNAL THROUGH SAID BODY THEREBY GENERATING A SIGNIFICANT PIEZOELECTRIC FIELD, AND MEANS INCLUDING A D.C. BIAS SOURCE FOR SIMULTANEOUSLY ESTABLISHING A D.C. FIELD IN SAID BODY, SAID FIELD HAVING A MAGNITUDE AND DIRECTION SUCH THAT THE DRIFT VELOCITY OF THE CARRIERS RESPONSIVE TO SAID FIELD HAS A VELOCITY COMPONENT ALONG THE AXIS DEFINED BY THE DIRECTION OF SAID ACOUSTIC WAVE PROPAGATION WHEREBY THE CARRIERS OF SAID D.C. FIELD INTERACT WITH THE SAID ACOUSTIC WAVE IN A MANNER SO AS TO MODIFY THE AMPLITUDE OF THE ACOUSITC WAVE.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |