US3773898A
Expired / Lapsed
US
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Compound ferroelectric-ferroelastic crystal
Assignee: Hitachi Ltd
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Filing: 1971-08-25
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Granted: 1973-11-20
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Expires: 1991-08-25
Abstract
Abstract A COMPOUND FERROELECTRIC-FERROELASTIC CRYSTAL DEFINED BY THE EXPRESSION (RXR''1-X)2O3-3MO1-EWEO3 WHERE R AND R'' ARE AT LEAST ONE RARE EARTH ELEMENT, X=0-1.0 AND E=0-0.2 AND HAVING THE GADOLINUM MOLYBDATE CRYSTRAL STRUCTURE BELONGING TO THE ORTHORHOMBIC SYSTEM AND THE POINT GROUP MM2. THE CRYSTAL HAS UNEQUAL A AND B LATTICE CONSTANTS, WHEREIN B-A/2A IS MORE THAN 1.0X10**-3, THUS EXHIBITING FERROELECTRIC-FERROELASTIC PROPERTIES.
Inventors
- 👤 K Aizu
- 👤 A Kumada
- 👤 H Yumoto
- 👤 S Ashida
- 👤 Y Furuhata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:33
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/025; H04; H04R; H04R17/00; H04R17/04; H04R17/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |