US3565577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing potassium niobate crystals
Assignee: AT&T Inc
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Filing: 1968-03-29
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Granted: 1971-02-23
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Expires: 1988-03-29
Abstract
Abstract SINGLE CRYSTALS OF KNB3O8 HAVE OBTAINED FROM A MELT CONTAINING AN EXCESS OF K2O OVER THE STOICHIOMETRIC AMOUNT. SUCH CRYSTALS EXHIBITS EXCELLENT CLEAVAGE, FLEXIBILITY, AND DIELECTRIC PROPERTIES WHICH ENABLE THEIR USE IN HIGH FREQUENCY, HIGH VOLTAGE, HIGH CAPACITANCE APPLICATIONS. SUCH CRYSTALS ARE ALSO TRANSPARENT TO ELECTROMAGNETIC RAIDATION WITHIN THE VISIBLE AND PORTIONS OF THE ULTRAVIOLET AND INFRARED SPECTRUMS, AND EXHIBIT A HIGH REFRACTIVE INDEX ENABLING THEIR USE AS LIGHT GUIDES.
Inventors
- 👤 John F Puluka
- 👤 John W Shiever
- 👤 Kurt Nassau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:17
CPC Classifications
C; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |