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Patent US3294556A successfully refreshed from Google Patents.
US3294556A
Expired / Lapsed
US
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Tan ophthalmic glass
Assignee: Corning Glass Works
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Filing: 1963-07-19
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Granted: 1966-12-27
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Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
- 👤 Roy V Harrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:48
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/093; C03C1/00; C03C1/10; C03C3/083; C03C3/085; C03C3/087; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A TAN OPHTHALMIC GLASS CONSISTING ESSENTIALLY OF THE FOLLOWING CALCULATED OXIDE COMPOSITION, IN PERCENT BY WEIGHT, 60 TO 73% SIO2, 0 TO 5% TIO2, 0 TO 5% AI2O3, 5 TO 10% CAO, 0 TO 5% ZNO, 5 TO 12% K2O, 5 TO 12% NA2O, 0 TO 5% B2O3, 0 TO .001% COO, 0.2 TO 0.6% NIO, 0.5 TO 2.0% CEO2 AND 0.5 TO 2.0% FE2O3, THE REFRACTIVE INDEX BEING BETWEEN 1.52 AND 1.53.
Claim 2
Dependent Claim
73 words
A TAN OPHTHALMIC GLASS CONSISTING ESSENTIALLY OF THE FOLLOWING CALCULATED OXIDE COMPOSITION, IN PERCENT BY WEIGHT, 60 TO 73% SIO2, 0 TO 5% TIO2, 0 TO 5% AI2O3, 5 TO 10% CAO, 0 TO 5% ZNO, 5 TO 12% K2O, 5 TO 12% NA2O, 0 TO 5% B2O3, 0 TO .001% COO, 0.2 TO 0.6% NIO, 0.5 TO 2.0% CEO2 AND 0.5 TO 2.0% FE2O3, THE REFRACTIVE INDEX BEING BETWEEN 1.52 AND 1.53.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |