US2790723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-index glass elements
Assignee: Minuesota Mining & Manufacturing Co
•
Filing: 1953-08-12
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Granted: 1957-04-30
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Expires: 1973-08-12
Abstract
No abstract record available.
Inventors
- 👤 Norman H Stradley
- 👤 Warren R Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:44
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/127; C03C12/00; C03C12/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
TRANSPARENT GLASS BEADS HAVING A DIAMETER NOT EXCEEDING 10 MILS, FORMED FROM GLASS CHARACTERIZED BY HAVING A REFRCTIVE INDEX OF AT LEAST 2.1 AND ESSENTIALLY CONSISTING OF A METAL OXIDE COMBINATION MEETING THE COMPOSITION REQUIREMENTS OF THE FOLLOWING TABLE WHEREIN PROPORTIONS ARE IN PERCENT BY WEIGHT:
Claim 2
Dependent Claim
46 words
TRANSPARENT GLASS BEADS HAVING A DIAMETER NOT EXCEEDING 10 MILS, FORMED FROM GLASS CHARACTERIZED BY HAVING A REFRCTIVE INDEX OF AT LEAST 2.1 AND ESSENTIALLY CONSISTING OF A METAL OXIDE COMBINATION MEETING THE COMPOSITION REQUIREMENTS OF THE FOLLOWING TABLE WHEREIN PROPORTIONS ARE IN PERCENT BY WEIGHT:
References Cited (Backward Citations)
US2220765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |