US2743553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal sealing glass and seal
Assignee: Corning Glass Works
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Filing: 1951-11-26
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Granted: 1956-05-01
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Expires: 1971-11-26
Abstract
No abstract record available.
Inventors
- 👤 William H Armistead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:26
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/02; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A GLASS WHICH CONSISTS ESSENTIALLY OF 65% TO 75% SIO2, 15% TO 22% B2O3, 1% TO 4% A12O3, AND AT LEAST TWO ALKALI METAL OXIDES INCLUDING K2O AND LI2O IN THE INDICATED PROPORTIONS SELECTED FROM THE GROUP CONSISTING OF 6% TO 10.5% K2O, UP TO 2% NA20 AND 0.2% TO 1.5% LI2O, THE TOTAL ALKALI METAL OXIDES BEING 7.5% TO 11%.
Claim 2
Dependent Claim
61 words
A GLASS WHICH CONSISTS ESSENTIALLY OF 65% TO 75% SIO2, 15% TO 22% B2O3, 1% TO 4% A12O3, AND AT LEAST TWO ALKALI METAL OXIDES INCLUDING K2O AND LI2O IN THE INDICATED PROPORTIONS SELECTED FROM THE GROUP CONSISTING OF 6% TO 10.5% K2O, UP TO 2% NA20 AND 0.2% TO 1.5% LI2O, THE TOTAL ALKALI METAL OXIDES BEING 7.5% TO 11%.
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) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |