US2901366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition
Assignee: PPG Industries Inc
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Filing: 1957-12-12
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Granted: 1959-08-25
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Expires: 1977-12-12
Abstract
No abstract record available.
Inventors
- 👤 John J Smith
- 👤 James E Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:10
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A GLASS HAVING SUBSTANTIALLY UNIFORM ABSORPTION OF LIGHT IN THE PORTION OF THE LIGHT SPECTRUM LYING BETWEEN 440 AND 660 MILLIMICRONS CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT: 50 TO 63 PERCENT SIO2, 2 TO 12 PERCENT AL2O3, THE SUM TOTAL OF SIO2 PLUS AL2O3 BEING 61 TO 68 PERCENT, 7 TO 22 PERCENT NA2O, 0.5 TO 17.5 PERCENT K2O, THE SUM TOTAL OF ALKALI METAL OXIDES BEING 20 TO 26 PERCENT, 10 P0 TO 8 PERCENT CAO, 0 TO 6 PERCENT MGO, 2 TO 10 PERCENT OF BIVALENT METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF BAO, PBO, CDO, SRO AND COMBINATIONS THEREOF, THE SUM TOTAL OF CAO, MGO AND SELECTED BIVALENT METAL OXIDES BEING 5 TO 12 PERCENT, 0.05 TO 1.0 PERCENT FE2O3, 0.001 TO 0.02 PERCENT COO AND 0.005 TO 0.05 PERCENT NIO.
Claim 2
Dependent Claim
139 words
A GLASS HAVING SUBSTANTIALLY UNIFORM ABSORPTION OF LIGHT IN THE PORTION OF THE LIGHT SPECTRUM LYING BETWEEN 440 AND 660 MILLIMICRONS CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT: 50 TO 63 PERCENT SIO2, 2 TO 12 PERCENT AL2O3, THE SUM TOTAL OF SIO2 PLUS AL2O3 BEING 61 TO 68 PERCENT, 7 TO 22 PERCENT NA2O, 0.5 TO 17.5 PERCENT K2O, THE SUM TOTAL OF ALKALI METAL OXIDES BEING 20 TO 26 PERCENT, 10 P0 TO 8 PERCENT CAO, 0 TO 6 PERCENT MGO, 2 TO 10 PERCENT OF BIVALENT METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF BAO, PBO, CDO, SRO AND COMBINATIONS THEREOF, THE SUM TOTAL OF CAO, MGO AND SELECTED BIVALENT METAL OXIDES BEING 5 TO 12 PERCENT, 0.05 TO 1.0 PERCENT FE2O3, 0.001 TO 0.02 PERCENT COO AND 0.005 TO 0.05 PERCENT NIO.
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) | 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 |