Patent US3902881A successfully refreshed from Google Patents.
US3902881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming an opalescent article having a colored bulk and at least one surface strata of a different color than the bulk
Assignee: Kimble Glass Inc
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Filing: 1971-06-04
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Granted: 1975-09-02
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Expires: 1991-06-04
Abstract
Abstract A glass article composed of silica and a coloring ion selected from Co, Ni, Cu, Sn, Sb, and Pb is subjected to a specified heat cycle, at least a portion of which is in a reducing atmosphere, to cause coloration of the bulk of the article and form at least one strata at the surface of the article which has a color different from that of the bulk. By selectively removing a portion of the strata multi-colored glass article is formed.
Inventors
- 👤 Perry P Pirooz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:58
CPC Classifications
C; C03; C03C; C03C23/00; C03C1/00; C03C1/10; C03C23/007; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C3/089; C03C3/091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
AN APALESCENT METHOD OF FORMING A GLASS ARTICLE COMPRISED OF A SILICA-CONTAINING BASE GLASS CONSISTING ESSENTIALLY OF BY WEIGHT ABOUT: 50-80% SIO2, 1-15% AL2O3, 0-15% B2O3, 1-20% CAO, 0-15% MGO, AND 0-13% R2O WHEREIN R IS AN ALKALI METAL ION, AND HAVING THEREIN A COLORING ION SELECTED FROM CO, NI, CU, SN, PB AND MIXTURES THEREOF, SAID GLASS ARTICLE HAVING A COLORED BULK GLASS AND AT LEAST ONE SURFACE STRATA OF A DIFFERENT COLOR THAN THE BULK, SAID METHOD COMPRISING, HEATING SAID ARTICLE TO A TEMPERATURE AND FOR A SUFFICIENT PERIOD OF TIME SUFFFICIENT TO FORM, IN-SITU, A COLORED BULK GLASS AND AT LEAST ONE SURFACE STRATA OF A DIFFERENT COLOR THAN THE BULK, SAID HEATING TAKING PLACE IN AT LEAST TWO STEPS, THE FIRST STEP BEING AT THE OPACIFICATION TEMPERATURE OF SAID ARTICLE AND THE SECOND STEP BEING CONDUCTED AT A TEMPERATURE LOWER THAN SAID FIRST STEP AND WHEREIN ONLY THE SECOND STEP IS CARRIED OUT IN A REDUCING ATMOSPHERE, SAID RESULTING ARTICLE BEING OPAQUE.
Claim 2
Dependent Claim
166 words
AN APALESCENT METHOD OF FORMING A GLASS ARTICLE COMPRISED OF A SILICA-CONTAINING BASE GLASS CONSISTING ESSENTIALLY OF BY WEIGHT ABOUT: 50-80% SIO2, 1-15% AL2O3, 0-15% B2O3, 1-20% CAO, 0-15% MGO, AND 0-13% R2O WHEREIN R IS AN ALKALI METAL ION, AND HAVING THEREIN A COLORING ION SELECTED FROM CO, NI, CU, SN, PB AND MIXTURES THEREOF, SAID GLASS ARTICLE HAVING A COLORED BULK GLASS AND AT LEAST ONE SURFACE STRATA OF A DIFFERENT COLOR THAN THE BULK, SAID METHOD COMPRISING, HEATING SAID ARTICLE TO A TEMPERATURE AND FOR A SUFFICIENT PERIOD OF TIME SUFFFICIENT TO FORM, IN-SITU, A COLORED BULK GLASS AND AT LEAST ONE SURFACE STRATA OF A DIFFERENT COLOR THAN THE BULK, SAID HEATING TAKING PLACE IN AT LEAST TWO STEPS, THE FIRST STEP BEING AT THE OPACIFICATION TEMPERATURE OF SAID ARTICLE AND THE SECOND STEP BEING CONDUCTED AT A TEMPERATURE LOWER THAN SAID FIRST STEP AND WHEREIN ONLY THE SECOND STEP IS CARRIED OUT IN A REDUCING ATMOSPHERE, SAID RESULTING ARTICLE BEING OPAQUE.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |