US2776900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition
Assignee: PPG Industries Inc
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Filing: 1953-12-16
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Granted: 1957-01-08
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Expires: 1973-12-16
Abstract
No abstract record available.
Inventors
- 👤 James E Duncan
- 👤 Samuel L Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:51
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/02; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A GLASS COMPOSITION HAVING AN OPAQUE, PASTEL COLOR RANGING FROM TAN TO YELLOW CONSISTING ESSENTIALLY OF SIO2 55 TO 75% BY WEIGHT; NA2O, 0 TO 15% BY WEIGHT; K2O, 0 TO 15% BY WEIGHT, THE SUM TOTAL OF ALKALI METAL OXIDE RANGING FROM ABOUT 11 TO 21%; AL2O3, 2 TO 12% BY WEIGHT; 0 TO 10 % BY WEIGHT CAO, 0 TO 12% BY WEIGHT MGO, 0 TO 12% BY WEIGHT BAO, AND 0 TO 12% BY WEIGHT ZNO, THE TOTAL OF BIVALENT METAL OXIDES WHEN PRESENT BEING NOT MORE THAN 12% BY WEIGHT; SB2OS, 3 TO 2% BY WEIGHT; AS2O5, 0 TO 2% BY WEIGHT; AU, .0005 TO .0024% BY WEIGHT; AG, .0004 TO .005% BY WEIGHT; SE, .0002 TO .002% BY WEIGHT AND FLUORINE 1 TO 6% BY WEIGHT.
Claim 2
Dependent Claim
131 words
A GLASS COMPOSITION HAVING AN OPAQUE, PASTEL COLOR RANGING FROM TAN TO YELLOW CONSISTING ESSENTIALLY OF SIO2 55 TO 75% BY WEIGHT; NA2O, 0 TO 15% BY WEIGHT; K2O, 0 TO 15% BY WEIGHT, THE SUM TOTAL OF ALKALI METAL OXIDE RANGING FROM ABOUT 11 TO 21%; AL2O3, 2 TO 12% BY WEIGHT; 0 TO 10 % BY WEIGHT CAO, 0 TO 12% BY WEIGHT MGO, 0 TO 12% BY WEIGHT BAO, AND 0 TO 12% BY WEIGHT ZNO, THE TOTAL OF BIVALENT METAL OXIDES WHEN PRESENT BEING NOT MORE THAN 12% BY WEIGHT; SB2OS, 3 TO 2% BY WEIGHT; AS2O5, 0 TO 2% BY WEIGHT; AU, .0005 TO .0024% BY WEIGHT; AG, .0004 TO .005% BY WEIGHT; SE, .0002 TO .002% BY WEIGHT AND FLUORINE 1 TO 6% BY WEIGHT.
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) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |