US2523264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophthalmic glass
Assignee: Corning Glass Works
•
Filing: 1947-06-30
•
Granted: 1950-09-26
•
Expires: 1967-06-30
Abstract
No abstract record available.
Inventors
- 👤 William H Armistead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:33
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/062; C03C3/064; C03C3/066; C03C3/091; C03C3/093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
AN OPHTHALMIC GLASS WHICH COMPRISES 33% TO 60% SIO2, 1% TO 7% B2O3, 2% TO 15% TO 15% ZRO2, 0.3% TO 5% LI2O, 1% TO 15% OF AN ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O, K2O, AND MIXTURES OF NA2O AND K2O, AND AT LEAST TWO BIVALENT METAL OXIDES IN THE INDICATED PROPORTIONS SELECTED FROM THE GROUP CONSISTING OF UP TO 25% BAO, UP TO 10% PBO, 3% TO 15% CAO, 3% TO 15% ZNO, 3% TO 15% SRO, 3% TO 15% CDO, AND 3% TO 30% OF A MIXTURE OF SRO AND CDO, THE MAXIMUM PROPORTION OF EITHER SRO OR CDO IN SAID MIXTURE BEING 15%, THE SELECTED BIVALENT METAL OXIDES INCLUDING AN OXIDE SELECTED FROM THE GROUP CONSISTING OF SRO, CDO, AND A MIXTURE OF SRO AND CDO IN THE ABOVE-INDICATED PROPORTION, THE TOTAL OF THE BIVALENT METAL OXIDES BEING BETWEEN 15% AND 50%, THE SOFTENING POINT OF THE GLASS BEING BELOW 700* C., THE REFRACTIVE INDEX (ND) BEING BETWEEN 1.57 AND 1.70 AND THE THERMAL EXPANSION COEFFICIENT BEING BETWEEN 83X10**-7 AND 95X10**-7 CM. PER CM. PER *C. BETWEEN 0* C. AND 300* C.
Claim 2
Dependent Claim
189 words
AN OPHTHALMIC GLASS WHICH COMPRISES 33% TO 60% SIO2, 1% TO 7% B2O3, 2% TO 15% TO 15% ZRO2, 0.3% TO 5% LI2O, 1% TO 15% OF AN ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O, K2O, AND MIXTURES OF NA2O AND K2O, AND AT LEAST TWO BIVALENT METAL OXIDES IN THE INDICATED PROPORTIONS SELECTED FROM THE GROUP CONSISTING OF UP TO 25% BAO, UP TO 10% PBO, 3% TO 15% CAO, 3% TO 15% ZNO, 3% TO 15% SRO, 3% TO 15% CDO, AND 3% TO 30% OF A MIXTURE OF SRO AND CDO, THE MAXIMUM PROPORTION OF EITHER SRO OR CDO IN SAID MIXTURE BEING 15%, THE SELECTED BIVALENT METAL OXIDES INCLUDING AN OXIDE SELECTED FROM THE GROUP CONSISTING OF SRO, CDO, AND A MIXTURE OF SRO AND CDO IN THE ABOVE-INDICATED PROPORTION, THE TOTAL OF THE BIVALENT METAL OXIDES BEING BETWEEN 15% AND 50%, THE SOFTENING POINT OF THE GLASS BEING BELOW 700* C., THE REFRACTIVE INDEX (ND) BEING BETWEEN 1.57 AND 1.70 AND THE THERMAL EXPANSION COEFFICIENT BEING BETWEEN 83X10**-7 AND 95X10**-7 CM. PER CM. PER *C. BETWEEN 0* C. AND 300* C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |