Patent US2894670A successfully refreshed from Google Patents.
US3238085A
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Process for manufacturing ceramiclike products from glass by microscopic crystallization
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1961-11-17
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Granted: 1966-03-01
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Expires: 1981-11-17
Abstract
No abstract record available.
Inventors
- 👤 Hayami Ryozo
- 👤 Tanaka Hirokichi
- 👤 Ogura Toru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:31
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0009; C03C10/0018; C03C10/0027
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
A PROCESS OF MANUFACTURING CERAMIC PRODUCTS FROM GLASS BY MICROSCOPIC CRYSTALLIZATION COMPRISING THE STEPS OF ADMIXING A GLASS FORMING COMPOSITION CONSISTING ESSENTIALLY OF THE SIO2-LI2O SYSTEM AND ONTAINING AS THE ESSENTIAL NUCLEATING AGENT BETWEEN 2 AND 8% BY WEIGHT OF AS2O3, FUSING THE MIXTURE FORMING SAID MIXTURE INTO A PREDETERMINED SHAPE, MAINTAINING SAID SHAPED PRODUCT AT A TEMPERATURE IN THE NEIGHBORHOOD OF THE YIELDING POINT OF THE GLASS TO PRODUCE NUCLEI THEREIN, AND THEN SUBJECTING SAID PRODUCT TO A HEAT TREATMENT CONTINUED AT A TEMPERATURE SLIGHTLY LOWER THAN THE YIELDING POINT OF SAID PRODUCT FOR A TIME PERIOD LONG ENOUGH FOR COMPLETING THE DESIRED MULTIPLICATION OF FINE CRYSTALS THEREIN.
Claim 2
Dependent Claim
109 words
A PROCESS OF MANUFACTURING CERAMIC PRODUCTS FROM GLASS BY MICROSCOPIC CRYSTALLIZATION COMPRISING THE STEPS OF ADMIXING A GLASS FORMING COMPOSITION CONSISTING ESSENTIALLY OF THE SIO2-LI2O SYSTEM AND ONTAINING AS THE ESSENTIAL NUCLEATING AGENT BETWEEN 2 AND 8% BY WEIGHT OF AS2O3, FUSING THE MIXTURE FORMING SAID MIXTURE INTO A PREDETERMINED SHAPE, MAINTAINING SAID SHAPED PRODUCT AT A TEMPERATURE IN THE NEIGHBORHOOD OF THE YIELDING POINT OF THE GLASS TO PRODUCE NUCLEI THEREIN, AND THEN SUBJECTING SAID PRODUCT TO A HEAT TREATMENT CONTINUED AT A TEMPERATURE SLIGHTLY LOWER THAN THE YIELDING POINT OF SAID PRODUCT FOR A TIME PERIOD LONG ENOUGH FOR COMPLETING THE DESIRED MULTIPLICATION OF FINE CRYSTALS THEREIN.
Claim 3
Dependent Claim
20 words
A CERAMIC PRODUCT, MADE AS SET FORTH IN CLAIM 1, CONTAINING 2 TO 8% OF AS2O3 AS A NUCLEATING AGENT.
References Cited (Backward Citations)
US2663658A
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US2971853A
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US2720473A
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US3113009A
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US2998675A
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US3117881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |