US2902377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition
Assignee: PPG Industries Inc
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Filing: 1958-01-07
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Granted: 1959-09-01
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Expires: 1978-01-07
Abstract
No abstract record available.
Inventors
- 👤 James E Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:49
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
A TAN TO BROWN OPAQUE GLASS CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT: 55 TO 75 PERCENT SIO2, 5 TO 20 PERCENT NA2O, 0 TO 10 PERCENT K2O, THE SUM TOTAL OF ALKALI METAL OXIDES RANGING FROM 11 TO 21 PERCENT, 2 TO 12 PERCENT AL2O3, UP TO 12 PERCENT OF A BIVALENT METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF 0 TO 10 PERCENT CAO, 0 TO 12 PERCENT MGO, 0 TO 12 PERCENT BAO, AND 0 TO 5 PERCENT ZNO, 0.1 TO 2 PERCENT AS2O5, 1 TO 6 PERCENT F, 0.03 TO 0.2 PERCENT SE AND 1 TO 3 PERCENT FE2O3.
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) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |