US2683666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opalescent ivory-colored glass
Assignee: PPG Industries Inc
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Filing: 1951-09-26
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Granted: 1954-07-13
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Expires: 1971-09-26
Abstract
No abstract record available.
Inventors
- 👤 Duncan James Earle
- 👤 Samuel L Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:22
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112; C03C4/00; C03C4/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
AN OPALESCENT IVORY COLORED GLASS CONSISTING ESSENTIALLY OF FROM 60 TO 70 PER CENT BY WEIGHT OF SIO2, FROM 15 TO 20 PER CENT BY WEIGHT OF COMBINDED ALKALI OXIDES SELECTED FROM THE GROUP CONSISTING OF NA2O AND K2O, FROM 0.1 TO 5 PER CENT BY WEIGHT OF CAO, FROM 0 TO 10 PER CENT BY WEIGHT OF AL2O3, FROM 4 TO 10 PER CENT BY WEIGHT OF TIO2, FROM 0.75 TO 2.25 PER CENT BY WEIGHT OF CEO2 AND FROM 4 TO 7 PER CENT BY WEIGHT OF F2.
Claim 2
Dependent Claim
90 words
AN OPALESCENT IVORY COLORED GLASS CONSISTING ESSENTIALLY OF FROM 60 TO 70 PER CENT BY WEIGHT OF SIO2, FROM 15 TO 20 PER CENT BY WEIGHT OF COMBINDED ALKALI OXIDES SELECTED FROM THE GROUP CONSISTING OF NA2O AND K2O, FROM 0.1 TO 5 PER CENT BY WEIGHT OF CAO, FROM 0 TO 10 PER CENT BY WEIGHT OF AL2O3, FROM 4 TO 10 PER CENT BY WEIGHT OF TIO2, FROM 0.75 TO 2.25 PER CENT BY WEIGHT OF CEO2 AND FROM 4 TO 7 PER CENT BY WEIGHT OF F2.
References Cited (Backward Citations)
US2444976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |