Patent US2939797A successfully refreshed from Google Patents.
US2939797A
Expired / Lapsed
US
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Glass compositions
Assignee: Prismo Safety Corp
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Filing: 1959-04-20
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Granted: 1960-06-07
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Expires: 1979-04-20
Abstract
No abstract record available.
Inventors
- 👤 Guy E Rindone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:30
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C12/00; C03C12/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
TRANSPARENT, WEATHER-RESISTANT SMALL GLASS BEADS HAVING A REFRACTIVE INDEX OF AT LEAST 1.90 AND A COMPOSITION CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN THE MOL PERCENTS INDICATED: B2O3 5.5-26.9 ZNO 0-20
Claim 2
Dependent Claim
31 words
TRANSPARENT, WEATHER-RESISTANT SMALL GLASS BEADS HAVING A REFRACTIVE INDEX OF AT LEAST 1.90 AND A COMPOSITION CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN THE MOL PERCENTS INDICATED: B2O3 5.5-26.9 ZNO 0-20
References Cited (Backward Citations)
US2702749A
Cited
US2790723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |