Patent US3437592A successfully refreshed from Google Patents.
Patent US3205079A successfully refreshed from Google Patents.
US3205079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semicrystalline ceramic body and method of making it
Assignee: Corning Glass Works
•
Filing: 1962-03-29
•
Granted: 1965-09-07
•
Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Stanley D Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:35
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD OF MANUFACTURING A SEMICRYSTALLINE CERAMIC BODY CAPABLE OF WITHSTANDING TEMPERATURES OVER ABOUT 1200*C. AND BEING RELATIVELY UNAFFECTED BY REDUCING 1200*C. AND BEING RELATIVELY UNAFFECTED BY REDUCING ATMOSPHERES, COMPRISING THE STEPS OF MELTING A GLASS-FORMING COMPOSITION CONSISTING, BY WEIGHT OF ABOUT 40-65% OF SIO2, ABOUT 15-35% OF AL2O3, ABOUT 5-28% OF MGO, AND ABOUT 5-25% OF ZRO2 AS A NUCLEATING AGENT, THE TOTAL OF SAID SIO2, AL2O3, MGO, AND ZRO2 COMPRISING AT LEAST ABOUT 90% OF SAID COMPOSITION AND UP TO 10% TOTAL OF THE COMPATIBLE METAL OXIDES B2O3, PBO, MNO, AND CR2O3, SIMULTANEOUSLY COOLING HTE MELT BELOW THE TRANSFORMATION POINT OF SAID MELT AND SHAPING A BODY THEREFROM THEREAFTER EXPOSING SAID BODY TO A TEMPERATURE OF AT LEAST ABOUT 900*C. BUT NOT OVER ABOUT 1350*C., FOR A TIME SUFFICIENT TO ATTAIN THE DESIREED CRYSTALLIZATION, AND THEN COOLING SAID SHAPE TO ROOM THEMPERTURE.
Claim 2
Independent Claim
144 words
A METHOD OF MANUFACTURING A SEMICRYSTALLINE CERAMIC BODY CAPABLE OF WITHSTANDING TEMPERATURES OVER ABOUT 1200*C. AND BEING RELATIVELY UNAFFECTED BY REDUCING 1200*C. AND BEING RELATIVELY UNAFFECTED BY REDUCING ATMOSPHERES, COMPRISING THE STEPS OF MELTING A GLASS-FORMING COMPOSITION CONSISTING, BY WEIGHT OF ABOUT 40-65% OF SIO2, ABOUT 15-35% OF AL2O3, ABOUT 5-28% OF MGO, AND ABOUT 5-25% OF ZRO2 AS A NUCLEATING AGENT, THE TOTAL OF SAID SIO2, AL2O3, MGO, AND ZRO2 COMPRISING AT LEAST ABOUT 90% OF SAID COMPOSITION AND UP TO 10% TOTAL OF THE COMPATIBLE METAL OXIDES B2O3, PBO, MNO, AND CR2O3, SIMULTANEOUSLY COOLING HTE MELT BELOW THE TRANSFORMATION POINT OF SAID MELT AND SHAPING A BODY THEREFROM THEREAFTER EXPOSING SAID BODY TO A TEMPERATURE OF AT LEAST ABOUT 900*C. BUT NOT OVER ABOUT 1350*C., FOR A TIME SUFFICIENT TO ATTAIN THE DESIREED CRYSTALLIZATION, AND THEN COOLING SAID SHAPE TO ROOM THEMPERTURE.
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) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |