US2853393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-index glass elements
Assignee: 3M Co
•
Filing: 1951-10-12
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Granted: 1958-09-23
•
Expires: 1971-10-12
Abstract
No abstract record available.
Inventors
- 👤 Warren R Beck
- 👤 Nelson W Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:15
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/122; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
TRANSPARENT GLASS BEADS HAVING A DIAMETER NOT EXCEEDING 10 MILS, FROM GLASS HAVING A REFRACTIVE INDEX OF AT LEAST 2.1 AND ESSENTIALLY CONSISTING OF A COMPOSITION OF INORGANIC OXIDES INCLUDING AT LEAST TWO POLYVALENT HEAVY METAL OXIDES, EACH PRECEMT IN THE AMOUNT OF AT LEAST 5% BY WEIGHT, SELECTED FROM THE PRIMARY GROUP CONSISTING OF BI2O3, PBO, TL2O3, WO3 TA2O5, AND CDO, THE SELECTION INCLUDING AT LEAST ONE MEMBER OF THE SUB-GROUP CONSISTING OF BI2/3 AND PBO, THE TOTAL AMOUNT OF SAID SUBGROUP OXIDES IN THE GLASS BEING AT LEAST 40% BY WEIGHT AND THE TOTAL AMOUNT OF SAID PRIMARY GROUP OXIDES IN THE GLASS BEING AT LEAST 75% BY WEIGHT AND SAID GLASS BEING FURTHER CHARACTERIZED BY 0 TO 10% BY WEIGHT OF STRONG GLASSFORMING OXIDES SELECTED FROM THE GROUP CONSISTING OF B2O3, SIO2, P2O5, GEO2, AND MIXTURES THEREOF, THE AMOUNT OF B2O3 IN THE GLASS BEING 0 TO 6% BY WEIGHT.
Claim 2
Dependent Claim
153 words
TRANSPARENT GLASS BEADS HAVING A DIAMETER NOT EXCEEDING 10 MILS, FROM GLASS HAVING A REFRACTIVE INDEX OF AT LEAST 2.1 AND ESSENTIALLY CONSISTING OF A COMPOSITION OF INORGANIC OXIDES INCLUDING AT LEAST TWO POLYVALENT HEAVY METAL OXIDES, EACH PRECEMT IN THE AMOUNT OF AT LEAST 5% BY WEIGHT, SELECTED FROM THE PRIMARY GROUP CONSISTING OF BI2O3, PBO, TL2O3, WO3 TA2O5, AND CDO, THE SELECTION INCLUDING AT LEAST ONE MEMBER OF THE SUB-GROUP CONSISTING OF BI2/3 AND PBO, THE TOTAL AMOUNT OF SAID SUBGROUP OXIDES IN THE GLASS BEING AT LEAST 40% BY WEIGHT AND THE TOTAL AMOUNT OF SAID PRIMARY GROUP OXIDES IN THE GLASS BEING AT LEAST 75% BY WEIGHT AND SAID GLASS BEING FURTHER CHARACTERIZED BY 0 TO 10% BY WEIGHT OF STRONG GLASSFORMING OXIDES SELECTED FROM THE GROUP CONSISTING OF B2O3, SIO2, P2O5, GEO2, AND MIXTURES THEREOF, THE AMOUNT OF B2O3 IN THE GLASS BEING 0 TO 6% BY WEIGHT.
References Cited (Backward Citations)
US2477649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |