US3775531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adding lead magnesium niobate to lead titanate/lead zirconate to aid hot pressing to transparency
Assignee: Corning Glass Works
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Filing: 1971-10-06
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Granted: 1973-11-27
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Expires: 1991-10-06
Abstract
Abstract DISCLOSED IS AN ELECTROOPTIC SYSTEM INCLUDING A TRANSPARENT FERROELECTRIC CERAMIC ELEMENT WHICH POSSESSES MEMORY IN THAT A BIREFRINGENCE CORRESPONDING TO AN APPLIED ELECTRIC FIELD REMAINS AFTER THE FIELD IS REMOVED. THE ELECTROOPTIC ELEMENT IS HOT-PRESSED FROM A FAMILY OF MATERIALS WHICH COMPRISES SOLID SOLUTIONS OF THE TERNARY SYSTEM, LEAD MAGNESIUM NIOBATE-LEAD TITANATE-LEAD ZIRCONATE, AND THE HOT PRESSED MATERIAL MAY ADDITIONALLY CONTAIN MINOR AMOUNTS OF LEAD BISMUTH NIOBATE OR BISMUTH OXIDE.
Inventors
- 👤 J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; C04B35/493; C04B35/622; C04B35/64; C04B35/645; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3231; C04B2235/3251; C04B2235/3255; C04B2235/3298; C04B2235/70; C04B2235/74; C04B2235/76; C04B2235/762; C04B2235/765; C04B2235/768; C04B2235/96; C04B2235/9607; C04B2235/9623; C04B2235/9646; C04B2235/9653
Claims Analysis
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |