US2901362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass compositions and method of making same
Assignee: American Optical Corp
•
Filing: 1955-05-18
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Granted: 1959-08-25
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Expires: 1975-05-18
Abstract
No abstract record available.
Inventors
- 👤 Alexis G Pincus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:39
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/247; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/902; Y10S501/903
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
A HOMOGENEOUS DURABLE CLEAR TRANSPARENT GLASS CONSISTING ESSENTIALLY OF THE FUSED PRODUCT OF APPROXIMTELY 20 TO 40% BY WEIGHT OF BERYLLIUM FLUORIDE (BEF2), APPROXIMATELY 10 TO 70% BY WEIGHT OF ALUMINUM SILICOFLUORIDE (AL2(SIF6)3) AND APPROXIMATELY 10 TO 70% BY WEIGHT OF SODIUM METAPHOSPHATE (NAPO3), SAID FUSED PRODUCT HAVING A LOW REFRACTIVE INDEX RANGING BETWEEN APPROXIMATELY 1.368 AND 1.447 AND A NU VALUE RANGING BETWEEN APPROXIMATLEY 64 AND 83.
References Cited (Backward Citations)
US2481700A
Cited
US2716069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |