US3940531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stain decorated glass-ceramic article
Assignee: PPG Industries Inc
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Filing: 1974-09-03
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Granted: 1976-02-24
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Expires: 1994-09-03
Abstract
Abstract A method for producing decorated glass-ceramic articles is disclosed. The method involves contacting a surface of a crystallizable glass with molten tin and thereafter applying to the tin-contacting surface a stain decorating composition. The article is then fired at a temperature such that the glass simultaneously crystallizes and the stain diffuses into the article to form the decoration.
Inventors
- 👤 Henry M. Demarest, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:13
CPC Classifications
C; C03; C03C; C03C10/00; C03C21/00; C03C21/001; C03C21/005; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/24942; Y10T428/2495; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A stain-decorated glass-ceramic article comprising: a solid body of fine-grain crystals dispersed in a glassy matrix, the crystals forming the major portion thereof, and including silica, alumina, lithia, and a crystal-nucleating agent, but substantially free of arsenic and antimony oxides; a tin-penetrated zone extending into said body at least 5 microns from at least one surface of said body and in which the tin ion concentration is greater than that in interior portions of said body; a colorant-penetrated zone extending into said body from 1 to 40 mils from portions of said at least one surface of said body and in which the concentration of colorant, selected from the group consisting of platinum, palladium, silver, and gold, is greater than in interior portions of said body.
Claim 2
Dependent Claim
126 words
A stain-decorated glass-ceramic article comprising: a solid body of fine-grain crystals dispersed in a glassy matrix, the crystals forming the major portion thereof, and including silica, alumina, lithia, and a crystal-nucleating agent, but substantially free of arsenic and antimony oxides; a tin-penetrated zone extending into said body at least 5 microns from at least one surface of said body and in which the tin ion concentration is greater than that in interior portions of said body; a colorant-penetrated zone extending into said body from 1 to 40 mils from portions of said at least one surface of said body and in which the concentration of colorant, selected from the group consisting of platinum, palladium, silver, and gold, is greater than in interior portions of said body.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |