US2901365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition
Assignee: PPG Industries Inc
•
Filing: 1957-11-25
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Granted: 1959-08-25
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Expires: 1977-11-25
Abstract
No abstract record available.
Inventors
- 👤 Samuel L Seymour
- 👤 James E Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:14
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C1/00; C03C1/10; C03C3/083; C03C3/085; C03C3/087; C03C3/089
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A GLASS HAVING A DENSITY OF 2.55 TO 2.65 GRAMS PER CUBIC CENTIMETER AND A REFRACTIVE INDEX, ND, OF 1.56 TO 1.58 CONSISTING ESSENTIALLY OF ATHE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT: 58 TO 64 PERCENT SIO2, 0 TO 17.5 PERCENT NA2O, 0 TO 15.5 PERCENT K2O, 0 TO 5 PERCENT LI2O, THE SUM TOTAL OF ALKALI METAL OXIDES BEING 12.5 TO 17.5 PERCENT, 7.5 TO 14 PERCENT OF ALKALI EARTH METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF CAO AND CAO PLUS MGO, 5 TO 9 PERCENT TIO2, 0 TO 10 PERCENT B2O3 AND 0 TO 3 PERCENT AL2O3, THE ABOVE LISTED ESSENTIAL IMGREDIENTS PLUS SMALL AMOUNTS OF COLORANTS CONSTITUTING 100 PERCENT BY WEIGHT OF THE GLASS.
Claim 2
Dependent Claim
118 words
A GLASS HAVING A DENSITY OF 2.55 TO 2.65 GRAMS PER CUBIC CENTIMETER AND A REFRACTIVE INDEX, ND, OF 1.56 TO 1.58 CONSISTING ESSENTIALLY OF ATHE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT: 58 TO 64 PERCENT SIO2, 0 TO 17.5 PERCENT NA2O, 0 TO 15.5 PERCENT K2O, 0 TO 5 PERCENT LI2O, THE SUM TOTAL OF ALKALI METAL OXIDES BEING 12.5 TO 17.5 PERCENT, 7.5 TO 14 PERCENT OF ALKALI EARTH METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF CAO AND CAO PLUS MGO, 5 TO 9 PERCENT TIO2, 0 TO 10 PERCENT B2O3 AND 0 TO 3 PERCENT AL2O3, THE ABOVE LISTED ESSENTIAL IMGREDIENTS PLUS SMALL AMOUNTS OF COLORANTS CONSTITUTING 100 PERCENT BY WEIGHT OF THE GLASS.
References Cited (Backward Citations)
USRE23049E
Cited
US2664359A
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 |