US3170780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing porcelain articles by crystallizing glass materials
Assignee: NGK Insulators Ltd
•
Filing: 1963-02-26
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Granted: 1965-02-23
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Expires: 1983-02-26
Abstract
No abstract record available.
Inventors
- 👤 Takehara Toshio
- 👤 Tsuji Akihiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C03C10/0063; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
A METHOD OF MANUFACTURING PORCELAIN ARTICLES BY CRYSTALLIZING GLASS MATERIALS WHICH COMPRISES THE STEPS OF PREPARING A MIXTURE OF COMPOSITIONS CONTAINING 40 TO 70% OF SIO2, 5 TO 12% OF AL2O3, 20 TO 38% OF OXIDE SELECTED FROM THE GROUP CONSISTING OF CAO AND MGO, 3 TO 8% OF NA2O AND 3 TO 2% OF F AS THE BASIC COMPOSITION AND ADDED WITH 1 TO 5% OF ZNS IN THE FORM SELECTED FROM THE GROUP CONSISTING OF ZNS AND A MIXTURE OF ZNO AND S AS NCULEATING AGENT AND 0 TO 3% OF REDUCING AGENT AND SOME COLORING AGENTS, IN WHICH THE TOTAL AMOUNT OF THE BASIC COMPOSITION COMPRISES AT LEAST 90% OF THE TOTAL GLASS MATERIAL, FUSING SAID MIXTURE IN REDUCING ATMOSPHERE, SHAPING TO A DESIRED ARTICLE AND SUBJECTING SAID ARTICLE TO HEAT TREATMENT BY RAISING THE TEMPERATURE TO A POINT LOWER THAN THE SOFTENING POINT OF THE GLASS AND MAINTAINING THAT TEMPERATURE FOR LESS THAN 6 HOURS AND THEN RAISING THE TEMPERATURE AT THE RATE OF LESS THAN 200*C./HR. UP TO 900 TO 1000*C. AND MAINTAINING THE TEMPERATURE FOR LESS THAN 4 HOURS TO COMPLETELY CRYSTALLIZE THE GLASS, THEREBY PRODUCING CERAMIC.
Claim 2
Independent Claim
193 words
A METHOD OF MANUFACTURING PORCELAIN ARTICLES BY CRYSTALLIZING GLASS MATERIALS WHICH COMPRISES THE STEPS OF PREPARING A MIXTURE OF COMPOSITIONS CONTAINING 40 TO 70% OF SIO2, 5 TO 12% OF AL2O3, 20 TO 38% OF OXIDE SELECTED FROM THE GROUP CONSISTING OF CAO AND MGO, 3 TO 8% OF NA2O AND 3 TO 2% OF F AS THE BASIC COMPOSITION AND ADDED WITH 1 TO 5% OF ZNS IN THE FORM SELECTED FROM THE GROUP CONSISTING OF ZNS AND A MIXTURE OF ZNO AND S AS NCULEATING AGENT AND 0 TO 3% OF REDUCING AGENT AND SOME COLORING AGENTS, IN WHICH THE TOTAL AMOUNT OF THE BASIC COMPOSITION COMPRISES AT LEAST 90% OF THE TOTAL GLASS MATERIAL, FUSING SAID MIXTURE IN REDUCING ATMOSPHERE, SHAPING TO A DESIRED ARTICLE AND SUBJECTING SAID ARTICLE TO HEAT TREATMENT BY RAISING THE TEMPERATURE TO A POINT LOWER THAN THE SOFTENING POINT OF THE GLASS AND MAINTAINING THAT TEMPERATURE FOR LESS THAN 6 HOURS AND THEN RAISING THE TEMPERATURE AT THE RATE OF LESS THAN 200*C./HR. UP TO 900 TO 1000*C. AND MAINTAINING THE TEMPERATURE FOR LESS THAN 4 HOURS TO COMPLETELY CRYSTALLIZE THE GLASS, THEREBY PRODUCING CERAMIC.
References Cited (Backward Citations)
US3006776A
Cited
US2920971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |