US3420685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kovar sealing glass
Assignee: Corning Glass Works
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Filing: 1965-10-20
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Granted: 1969-01-07
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Expires: 1985-10-20
Abstract
No abstract record available.
Inventors
- 👤 Francis W Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:30
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112; C03C3/115; C03C3/118; C03C3/089; C03C3/091; C03C3/093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A GLASS COMPOSITION FOR FORMING SEALS WITH AN ALLOY OF NICKEL, COBALT, AND IRON CONSISTING ESSENTIALLY IN WEIGHT PERCENT ON THE OXIDE BASIS OF 64 TO 68% OF SILICA, 19 TO 21% OF BORIC OXIDE, 1 TO 3% OF ALUMINA, 5 TO 7% OF POTASSIUM OXIDE, 1 TO 3% OF SODIUM OXIDE, 0.5 TO 1.5% OF LITHIUM OXIDE, AND 2 TO 4% OF ZINC OXIDE.
Claim 2
Dependent Claim
65 words
A GLASS COMPOSITION FOR FORMING SEALS WITH AN ALLOY OF NICKEL, COBALT, AND IRON CONSISTING ESSENTIALLY IN WEIGHT PERCENT ON THE OXIDE BASIS OF 64 TO 68% OF SILICA, 19 TO 21% OF BORIC OXIDE, 1 TO 3% OF ALUMINA, 5 TO 7% OF POTASSIUM OXIDE, 1 TO 3% OF SODIUM OXIDE, 0.5 TO 1.5% OF LITHIUM OXIDE, AND 2 TO 4% OF ZINC OXIDE.
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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |