Patent US3294557A successfully refreshed from Google Patents.
US3294557A
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Electrically resistant glass compositions
Assignee: Compagnie de Saint Gobain SA
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Filing: 1966-03-08
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Granted: 1966-12-27
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Expires: 1986-03-08
Abstract
No abstract record available.
Inventors
- 👤 Lajarte Stephane Dufaure De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:08
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
ELECTRICALLY RESISTANT GLASS, PARTICULARLY USEFUL FOR ELECTRICALLY INSULATORS, HAVING A COMPOSITION CONSISTING ESSENTIALLY OF SIO2 69.6% BY WEIGHT; AI2O3 3.5%; FE2O3 0.8%; MNO 0.3%; CAO 11%; MGO 2%; NA2O 10.6%; K2O 2.2% HAVING AN UPPER LIMIT OF DEVITRIFICATION CIRCA 1135*C., A MAXIMUM RATE OF CRYSTALLIZATION AT ABOUT 1016*C., A MAXIMUM RATE OF DEVITRIFICATION CIRCA 7.5 MICRONS/MINUTE, AND A RESISTANCE TO PERFORATION AT 200*C. OF ABOUT 24.5 KV.
Claim 2
Dependent Claim
67 words
ELECTRICALLY RESISTANT GLASS, PARTICULARLY USEFUL FOR ELECTRICALLY INSULATORS, HAVING A COMPOSITION CONSISTING ESSENTIALLY OF SIO2 69.6% BY WEIGHT; AI2O3 3.5%; FE2O3 0.8%; MNO 0.3%; CAO 11%; MGO 2%; NA2O 10.6%; K2O 2.2% HAVING AN UPPER LIMIT OF DEVITRIFICATION CIRCA 1135*C., A MAXIMUM RATE OF CRYSTALLIZATION AT ABOUT 1016*C., A MAXIMUM RATE OF DEVITRIFICATION CIRCA 7.5 MICRONS/MINUTE, AND A RESISTANCE TO PERFORATION AT 200*C. OF ABOUT 24.5 KV.
References Cited (Backward Citations)
US2443142A
Cited
US2756158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |