US3776764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
METHOD FOR SEALING GLASS, METAL OR CERAMICS WITH MIXTURE OF PbO GLASS AND {62 -EUCRYPTITE CONTAINING GLASS
Assignee: Nippon Electric Glass Co Ltd
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Filing: 1970-08-24
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Granted: 1973-12-04
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Expires: 1990-08-24
Abstract
Abstract A sealing glass comprising a primary composition suitable as a solder, having a rapid rate of crystallization at a low temperature, a high melting point and a high coefficient of expansion, and a secondary glass composition having an extremely low coefficient of expansion crystallizing at a high temperature. The two compositions are mixed in predetermined ratio and placed under sealing heat conditions where they are caused to react to produce a third composition having a crystal which is higher in melting point and sealing resistance to reheating but which is lower in coefficient of expansion.
Inventors
- 👤 K Takagi
- 👤 S Kawamura
- 👤 H Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:39
CPC Classifications
C; C03; C03C; C03C27/00; C03C10/00; C03C10/0054; C03C8/00; C03C8/24; C03C8/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3211826A
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US3425817A
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US3421916A
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US3258350A
Cited
FR1490599A
Cited
US3705050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |