US3241935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone china and method of making it
Assignee: Corning Glass Works
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Filing: 1963-07-29
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Granted: 1966-03-22
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 Stanley D Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:05
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
THE METHOD OF MAKING A SEMICRYSTALLINE CERAMIC HAVING THE PROPERTIES OF BONE CHINA WHICH COMPRISES MELTING A COMPOSITION, CONSISTING ESSENTIALLY OF SIO2, CA2P2O7 AND AL2O3 IN TH RELATIVE PROPORTIONS OF 30-48% SIO2, 34-54* CA2P2O7 AND 15-21* AL2O3 BY WEIGHT, THE WEIGHT-RATIO CA2P2O7/AL2O3 BEING NOT LESS THAN 1.85, TO A HOMOGENEOUS GLASS, SHAPING THE GLASS TO FORM AN ARTICLE, COOLING THE SHAPED ARTICLE TO A TEMPERATURE AT LEAST AS LOW AS ABOUT 850*C., RAISING THE TEMPERATURE OF THE ARTICLE BETWEEN 850*C. AND 1050*C. AT A RATE NOT EXCEEDING ABOUT 5*C. PER MINUTE AND HOLDNG IT AT ABOUT 1050*C. UNTIL ITS LINEAR THERMAL EXPANSION COEFFICIENT HAS INCREASED TO MORE THAN 90X10**-7 PER *C. BETWEEN 3* AND 300*C.
Claim 2
Independent Claim
115 words
THE METHOD OF MAKING A SEMICRYSTALLINE CERAMIC HAVING THE PROPERTIES OF BONE CHINA WHICH COMPRISES MELTING A COMPOSITION, CONSISTING ESSENTIALLY OF SIO2, CA2P2O7 AND AL2O3 IN TH RELATIVE PROPORTIONS OF 30-48% SIO2, 34-54* CA2P2O7 AND 15-21* AL2O3 BY WEIGHT, THE WEIGHT-RATIO CA2P2O7/AL2O3 BEING NOT LESS THAN 1.85, TO A HOMOGENEOUS GLASS, SHAPING THE GLASS TO FORM AN ARTICLE, COOLING THE SHAPED ARTICLE TO A TEMPERATURE AT LEAST AS LOW AS ABOUT 850*C., RAISING THE TEMPERATURE OF THE ARTICLE BETWEEN 850*C. AND 1050*C. AT A RATE NOT EXCEEDING ABOUT 5*C. PER MINUTE AND HOLDNG IT AT ABOUT 1050*C. UNTIL ITS LINEAR THERMAL EXPANSION COEFFICIENT HAS INCREASED TO MORE THAN 90X10**-7 PER *C. BETWEEN 3* AND 300*C.
References Cited (Backward Citations)
US2359784A
Cited
US2532386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |