US2729757A
Expired / Lapsed
US
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Ferroelectric ceramic composition and method of making same
Assignee: General Electric Co
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Filing: 1951-06-09
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Granted: 1956-01-03
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Expires: 1971-06-09
Abstract
No abstract record available.
Inventors
- 👤 Goodman Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:02
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; C04B35/495; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3201; C04B2235/3231; C04B2235/3251; C04B2235/3255; C04B2235/3296; C04B2235/70; C04B2235/74; C04B2235/76; C04B2235/768; C04B2235/77
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
A TRANSDUCER COMPRISING A COHERENT FIRED BODY OF PIEZOELECTRIC CERAMIC CONSISTING ESSENTIALLY OF A COMBINATION OF PBO AND NB2O5 IN WHICH THE MOLAR RATIO OF LEAD TO NIOBIUM IS BETWEEN 0.25 AND 0.75 TO 1, SAID BODY HAVING ELECTRODES ON OPPOSING SURFACES THEREOF.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |