US3296005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bronze-smoke ophthalmic glass composition
Assignee: PPG Industries Inc
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Filing: 1964-12-23
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Granted: 1967-01-03
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Expires: 1984-12-23
Abstract
No abstract record available.
Inventors
- 👤 James E Duncan
- 👤 Joseph E Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:40
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A BRONZE-SMOKE GLASS CONSISTING IN ITS ESSENTIAL INGREDIENTS OF THE FOLLOWING COMPONENTS IN PERCENT BY WEIGHT: 65 TO 73 PERCENT SIO2; 0 TO 7.0 PERCENT NA2O; 9.0 TO 19.0 PERCENT K2O, THE TOTAL WEIGHT OF NA2O AND K2O BEING 14 TO 19 PERCENT AND THE WEIGHT RATIO OF K2O TO NA2O BEING 1.4 TO INFINITY; 4 TO 10 PERCENT ZNO; 0.5 TO 5 PERCENT BAO; 0.1 TO 4 PERCENT AL2O3; 1.5 TO 5.5 PERCENT FE2O3; 0.0003 TO 0.012 PERCENT COO; 0.0001 TO 0.2 PERCENT SE; 0 TO 2.0 PERCENT SB2O5; AND WHICH HAS A COEFFICIENT OF THERMAL EXPANSION BETWEEN 4.9 AND 5.3X10-**6 PER* F. BETWEEN 70* F. AND 575*F., AN INDEX OF REFRACTION FROM 1.521 TO 1.525 AND A SOFTENING POINT ABOVE 1315*F.
Claim 2
Dependent Claim
123 words
A BRONZE-SMOKE GLASS CONSISTING IN ITS ESSENTIAL INGREDIENTS OF THE FOLLOWING COMPONENTS IN PERCENT BY WEIGHT: 65 TO 73 PERCENT SIO2; 0 TO 7.0 PERCENT NA2O; 9.0 TO 19.0 PERCENT K2O, THE TOTAL WEIGHT OF NA2O AND K2O BEING 14 TO 19 PERCENT AND THE WEIGHT RATIO OF K2O TO NA2O BEING 1.4 TO INFINITY; 4 TO 10 PERCENT ZNO; 0.5 TO 5 PERCENT BAO; 0.1 TO 4 PERCENT AL2O3; 1.5 TO 5.5 PERCENT FE2O3; 0.0003 TO 0.012 PERCENT COO; 0.0001 TO 0.2 PERCENT SE; 0 TO 2.0 PERCENT SB2O5; AND WHICH HAS A COEFFICIENT OF THERMAL EXPANSION BETWEEN 4.9 AND 5.3X10-**6 PER* F. BETWEEN 70* F. AND 575*F., AN INDEX OF REFRACTION FROM 1.521 TO 1.525 AND A SOFTENING POINT ABOVE 1315*F.
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |