US2934444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-making material and method
Assignee: Corning Glass Works
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Filing: 1955-04-13
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Granted: 1960-04-26
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Expires: 1975-04-13
Abstract
No abstract record available.
Inventors
- 👤 Rowland D Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:27
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN THE MELTING OF GLASSES CONTAINING NA2O AND B2O3 THE IMPROVEMENT WHICH COMPRISES INTRODUCING AT LEAST A SUBSTANTIAL PORTION OF THE NA2O AND B2O3 INTO THE GLASS BATCH IN THE FORM OF A SODIUM POLYBORATE WHICH IS SUBSTANTIALLY FREE FROM CHEMICALLY COMBINED WATER AND WHICH IS COMPOSED, ON AN OXIDE BASIS, OF B2O3 AND NA2O WITH THE CONTENT OF NA2O BEING AT LEAST 1% BUT LESS THAN 31% AND THE REMAINDER, ON AN ANHYDROUS WEIGHT BASIS, BEING B2O3.
Claim 2
Dependent Claim
78 words
IN THE MELTING OF GLASSES CONTAINING NA2O AND B2O3 THE IMPROVEMENT WHICH COMPRISES INTRODUCING AT LEAST A SUBSTANTIAL PORTION OF THE NA2O AND B2O3 INTO THE GLASS BATCH IN THE FORM OF A SODIUM POLYBORATE WHICH IS SUBSTANTIALLY FREE FROM CHEMICALLY COMBINED WATER AND WHICH IS COMPOSED, ON AN OXIDE BASIS, OF B2O3 AND NA2O WITH THE CONTENT OF NA2O BEING AT LEAST 1% BUT LESS THAN 31% AND THE REMAINDER, ON AN ANHYDROUS WEIGHT BASIS, BEING B2O3.
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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |