Patent US2870030A successfully refreshed from Google Patents.
US2870030A
Expired / Lapsed
US
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High-index glass elements
Assignee: 3M Co
•
Filing: 1955-07-18
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Granted: 1959-01-20
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Expires: 1975-07-18
Abstract
No abstract record available.
Inventors
- 👤 Norman H Stradley
- 👤 Warren R Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:56
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/127; C03C3/04; C03C3/062; C03C3/14; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10S501/00; Y10S501/90; Y10S501/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
TRANSPARENT GLASS BEADS RESISTANT TO ATTACK BY ACIDS AND HAVING A DIAMETER NOT EXCEEDING 10 MILS, SAID BEADS BEING FORMED FROM A GLASS CHARACTERIZED BY HAVING A REFRACTIVE INDEX OF AT LEAST 2.2 AND ESSENTIALLY CONSISTING OF A METAL OXIDE COMBINATION MEETING THE COMPOSITION REQUIREMENTS OF THE FOLLOWING TABLE WHEREIN AMOUNTS ARE SPECIFIED IN WEIGHT PERCENT: BI2O3 70-99 TIO2 0-30 BI2O3+TIO2 80-100 ZNO 0-15 ALKALINE EARTH OXIDES 0-20 STRONG GLASSFORMERS 0-10 SAID ALKALINE EARTH OXIDES BEING SELECTED FROM THE GROUP CONSISTING OF BAO, MGO, CAO, AND SRO, AND SAID STRONG GLASSFORMERS BEING SELECTED FROM THE GROUP CONSISTING OF B2O3, SIO2, P2O5, AND GEO2.
Claim 2
Dependent Claim
103 words
TRANSPARENT GLASS BEADS RESISTANT TO ATTACK BY ACIDS AND HAVING A DIAMETER NOT EXCEEDING 10 MILS, SAID BEADS BEING FORMED FROM A GLASS CHARACTERIZED BY HAVING A REFRACTIVE INDEX OF AT LEAST 2.2 AND ESSENTIALLY CONSISTING OF A METAL OXIDE COMBINATION MEETING THE COMPOSITION REQUIREMENTS OF THE FOLLOWING TABLE WHEREIN AMOUNTS ARE SPECIFIED IN WEIGHT PERCENT: BI2O3 70-99 TIO2 0-30 BI2O3+TIO2 80-100 ZNO 0-15 ALKALINE EARTH OXIDES 0-20 STRONG GLASSFORMERS 0-10 SAID ALKALINE EARTH OXIDES BEING SELECTED FROM THE GROUP CONSISTING OF BAO, MGO, CAO, AND SRO, AND SAID STRONG GLASSFORMERS BEING SELECTED FROM THE GROUP CONSISTING OF B2O3, SIO2, P2O5, AND GEO2.
References Cited (Backward Citations)
US2220765A
Cited
US2726161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |