US2921860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opal glass
Assignee: Corning Glass Works
•
Filing: 1954-12-09
•
Granted: 1960-01-19
•
Expires: 1974-12-09
Abstract
No abstract record available.
Inventors
- 👤 Stanley D Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:37
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112; C03C3/115; C03C3/118
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
AN OPAL GLASS WHICH, AS CALCULATED IN WEIGHT PERCENT FROM BATCH COMPOSITION, CONSISTS ESSENTIALLY OF 55-75% SI02, 2-12% AL203, 0.5-3% LI20, 6-191 1/2% NA20, THE TOTAL ALKALI METAL OXIDE CONTENT BEING 12-20%, AND 5-9% F, THE ESSENTIAL CONSTITUENTS TOTALING AT LEAST 83%, SAID GLASS BEING SPONTANEOUSLY OPACIFIABLE DURING MOLDING OF AN ARTICLE THEREFROM.
Claim 2
Dependent Claim
53 words
AN OPAL GLASS WHICH, AS CALCULATED IN WEIGHT PERCENT FROM BATCH COMPOSITION, CONSISTS ESSENTIALLY OF 55-75% SI02, 2-12% AL203, 0.5-3% LI20, 6-191 1/2% NA20, THE TOTAL ALKALI METAL OXIDE CONTENT BEING 12-20%, AND 5-9% F, THE ESSENTIAL CONSTITUENTS TOTALING AT LEAST 83%, SAID GLASS BEING SPONTANEOUSLY OPACIFIABLE DURING MOLDING OF AN ARTICLE THEREFROM.
References Cited (Backward Citations)
GB492960A
Cited
US2224469A
Cited
US2610444A
Cited
US2527693A
Cited
US2571242A
Cited
US2596990A
Cited
US2683666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |