US2898219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ivory, opalescent glasses
Assignee: PPG Industries Inc
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Filing: 1957-06-27
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Granted: 1959-08-04
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Expires: 1977-06-27
Abstract
No abstract record available.
Inventors
- 👤 James E Duncan
- 👤 Samuel L Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:57
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
AN IVORY, OPAQUE GLASS CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT: 60 TO 75 PERCENT SIO2 13 TO 21 PERCENT ALKALI METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF 5 TO 18 PERCENT NA2O AND 0 TO 10 PERCENT K2O, 2 TO 12 PERCENT AL2O3, 0 TO 10 PERCENT CAO, 0 TO 12 PERCENT ZNO, AND 0 TO 12 PERCENT BAO, THE SUM OF THE BIVALENT METAL OXIDES BEING NOT GREATER THAN 12 PERCENT WHEN PRESENT, 0 TO 2 PERCENT AS2O5, 0 TO 5 PERCENT TIO2, 1 TO 7 PERCENT, O TO 2 PERCENT 0.1 PERCENT CHROMIUM OXIDE AND 0.01 TO 09I PERCENT SELENIUM.
Claim 2
Dependent Claim
107 words
AN IVORY, OPAQUE GLASS CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN PERCENT BY WEIGHT: 60 TO 75 PERCENT SIO2 13 TO 21 PERCENT ALKALI METAL OXIDES SELECTED FROM THE GROUP CONSISTING OF 5 TO 18 PERCENT NA2O AND 0 TO 10 PERCENT K2O, 2 TO 12 PERCENT AL2O3, 0 TO 10 PERCENT CAO, 0 TO 12 PERCENT ZNO, AND 0 TO 12 PERCENT BAO, THE SUM OF THE BIVALENT METAL OXIDES BEING NOT GREATER THAN 12 PERCENT WHEN PRESENT, 0 TO 2 PERCENT AS2O5, 0 TO 5 PERCENT TIO2, 1 TO 7 PERCENT, O TO 2 PERCENT 0.1 PERCENT CHROMIUM OXIDE AND 0.01 TO 09I PERCENT SELENIUM.
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) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |