US3615757A
Expired / Lapsed
US
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High dielectric constant niobate-titanate glass-ceramic articles
Assignee: Corning Glass Works
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Filing: 1968-05-31
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Granted: 1971-10-26
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Expires: 1988-05-31
Abstract
Abstract This invention relates to the manufacture of glass-ceramic materials which are especially well suited for the production of high-performance capacitors. These materials are transparent, are essentially free from Na2O, and contain crystals preferably of alkaline earth niobates or titanates, varying in size between about 100-2,000 A.
Inventors
- 👤 Andrew Herczog
- 👤 Margaret M Layton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:32
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/129; C; C03; C03C; C03C10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A transparent glass-ceramic article according to claim 1 wherein the compounds of A2 B4 O3 consist of alkaline earth metal titanates and the compounds of A2 B25 O6 and A22 B25 O7consist of mixed alkaline earth metal niobates.
Claim 2
Dependent Claim
64 words
A transparent glass-ceramic article according to claim 3 wherein the compounds of A2 B4 O3 consist essentially, by weight on the oxide basis, of about 50-65 percent A2 O and 20-35 percent B4 O2 and the compounds of A2 B25 O6 and A22 B25 O7 consist essentially, by weight on the oxide basis, of about 15-45 percent A2 O and 40-70 percent B25 O5.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |