US3149016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nucleated glass particle and process for making it
Assignee: 3M Co
•
Filing: 1962-04-02
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Granted: 1964-09-15
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Expires: 1982-04-02
Abstract
No abstract record available.
Inventors
- 👤 Tung Chi Fang
- 👤 Warren R Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:55
CPC Classifications
C; C03; C03C; C03C23/00; C03C23/007; C03B; C03B19/00; C03B19/10; C03B19/1095; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
THE PROCESS FOR INCREASING THE REFRACTIVE INDEX OF TRANSPARENT GLASS PARTICLES NO LARGER THAN ABOUT 2 MM., HAVING A COMPOSITION CONTAINING AT LEAST 25% BY WEIGHT OF CRYSTALLIZABLE GLASSFORMING CONSTITUENTS, SAID PROCESS AT LEAST ABOUT ONE MINUTE UP TO ABOUT ONE HOUR TO A TEMPERATURE BETWEEN 450 TO 1100*C., THE SPECIFIC TEMPERATURE SELECTED FOR SAID HEAT TREATMENT BEING AT LEAST 300* C. BELOW THE LIQUIDUS TEMPERATURE OF THE GLASS OF SAID PARTICLES UNDERGOING TREATMENT AND BEING AT LEAST SUFFICIENT TO CAUSE THE GLASS UNDERGOING TREATMENT TO UNDER GO AN EXOTHERMIC CHANGE ELEVATING IT AT LEAST ABOUT 10*C. ABOVE ITS TEMPERATURE PRIOR TO SAID EXOTHERMIC CHANGE THEREBY TO EFFECT NUCLEATION OF THE GLASS OF SAID PARTICLES.
Claim 2
Dependent Claim
115 words
THE PROCESS FOR INCREASING THE REFRACTIVE INDEX OF TRANSPARENT GLASS PARTICLES NO LARGER THAN ABOUT 2 MM., HAVING A COMPOSITION CONTAINING AT LEAST 25% BY WEIGHT OF CRYSTALLIZABLE GLASSFORMING CONSTITUENTS, SAID PROCESS AT LEAST ABOUT ONE MINUTE UP TO ABOUT ONE HOUR TO A TEMPERATURE BETWEEN 450 TO 1100*C., THE SPECIFIC TEMPERATURE SELECTED FOR SAID HEAT TREATMENT BEING AT LEAST 300* C. BELOW THE LIQUIDUS TEMPERATURE OF THE GLASS OF SAID PARTICLES UNDERGOING TREATMENT AND BEING AT LEAST SUFFICIENT TO CAUSE THE GLASS UNDERGOING TREATMENT TO UNDER GO AN EXOTHERMIC CHANGE ELEVATING IT AT LEAST ABOUT 10*C. ABOVE ITS TEMPERATURE PRIOR TO SAID EXOTHERMIC CHANGE THEREBY TO EFFECT NUCLEATION OF THE GLASS OF SAID PARTICLES.
Claim 3
Dependent Claim
36 words
NUCLEATED TRANSPARENT GLASSY PARTICLES FORMED BY THE PROCESS OF CLAIM 1 HAVING AN INCREASE OF REFRACTIVE INDEX OF AT LEAST 0.03 OVER THE REFRACTIVE INDEX OF SAID PARTICLES PRIOR TO THE TREATMENT SPECIFIED IN CLAIM 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |