US3240962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric transducer
Assignee: AT&T Inc
•
Filing: 1962-07-03
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Granted: 1966-03-15
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Expires: 1982-07-03
Abstract
No abstract record available.
Inventors
- 👤 Donald L White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:50
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0651; H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/13; H03H9/133
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PIEZOELECTRIC TRANSDUCER COMPRISING A BASE MEMBER OF LOW RESISTIVITY SEMICONDUCTIVE MATERIAL, A THIN LAYER OF HIGH RESISITIVITY PIEZOELECTRIC SEMICONDUCTIVE MATERIAL FORMED INTEGRALLY UPON SAID BASE MEMBER, SAID HIGH RESISTIVITY BEING MANY TIMES THAT OF SAID LOW RESISTIVITY AS A RESULT OF SUBSTANTIAL DIFFERENCES IN THE IMPURITY CONTENT OF SAID LAYER MATERIAL AND SAID BASE MATERIAL, SAID HIGH RESISTIVITY BEING MANY TIMES GREATER THAN
Claim 2
Dependent Claim
64 words
A PIEZOELECTRIC TRANSDUCER COMPRISING A BASE MEMBER OF LOW RESISTIVITY SEMICONDUCTIVE MATERIAL, A THIN LAYER OF HIGH RESISITIVITY PIEZOELECTRIC SEMICONDUCTIVE MATERIAL FORMED INTEGRALLY UPON SAID BASE MEMBER, SAID HIGH RESISTIVITY BEING MANY TIMES THAT OF SAID LOW RESISTIVITY AS A RESULT OF SUBSTANTIAL DIFFERENCES IN THE IMPURITY CONTENT OF SAID LAYER MATERIAL AND SAID BASE MATERIAL, SAID HIGH RESISTIVITY BEING MANY TIMES GREATER THAN
References Cited (Backward Citations)
US2698909A
Cited
US3018539A
Cited
US2925502A
Cited
US3057762A
Cited
US3038241A
Cited
US3109758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |