US3907586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass articles having a brown to reddish-brown color from borosilicate glass of a low thermal expansion by means of silver diffusion dye
Assignee: Schott AG
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Filing: 1973-06-28
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Granted: 1975-09-23
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Expires: 1993-06-28
Abstract
Abstract The silver diffusion dyeability of borosilicate glasses having a low thermal expansion coefficient and which are essentially free of arsenic and antimony is improved by adding 0.005-0.5 wt. % tin to a melt of the glass.
Inventors
- 👤 Werner Kiefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:16
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/10; C03C21/00; C03C21/001; C03C21/005; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
IN A BOROSILICATE GLASS HAVING AT LEAST A PORTION THEREOF SILVER DIFFUSION DYED TO A BROWN TO REDDISH BROWN COLOR, HAVING A THERMAL COEFFICIENT OF EXPANSION OF LESS THAN 33.5X10**-7 CM .CM-1*C-1 AND BEING ESSENTIALLY FREE OF ARSENCE OXIDE AND ANTIMONY OXIDE, THE IMPROVEMENT WHICH COMPRISES 0.005-0.5 WT.% TIN UNIFORMLY DISPERESED THEREIN BY ADMIXTURE TO THE MELT PHASE OF SAID GLASS, WHEREBY A SUBSTANTIALLY DEEPER BROWN TO REDDISH BROWN COLOR IS OBTAINED, THE DEPT OF COLOR BEING PROPORTIONAL TO THE AMOUNT OF TIN ADDED.
Claim 2
Dependent Claim
84 words
IN A BOROSILICATE GLASS HAVING AT LEAST A PORTION THEREOF SILVER DIFFUSION DYED TO A BROWN TO REDDISH BROWN COLOR, HAVING A THERMAL COEFFICIENT OF EXPANSION OF LESS THAN 33.5X10**-7 CM .CM-1*C-1 AND BEING ESSENTIALLY FREE OF ARSENCE OXIDE AND ANTIMONY OXIDE, THE IMPROVEMENT WHICH COMPRISES 0.005-0.5 WT.% TIN UNIFORMLY DISPERESED THEREIN BY ADMIXTURE TO THE MELT PHASE OF SAID GLASS, WHEREBY A SUBSTANTIALLY DEEPER BROWN TO REDDISH BROWN COLOR IS OBTAINED, THE DEPT OF COLOR BEING PROPORTIONAL TO THE AMOUNT OF TIN ADDED.
Claim 3
Dependent Claim
23 words
A borosilicate glass composition according to claim 1 wherein said tin is added to said melt in the zerovalent, bivalent or tetravalent state.
Claim 4
Dependent Claim
23 words
A borosilicate glass composition according to claim 2 wherein said tin is added as metallic tin, tin (II) oxide or tin (IV) oxide.
Claim 5
Dependent Claim
16 words
A borosilicate glass composition according to claim 3 wherein said tin is added as tin oxide.
Claim 6
Dependent Claim
12 words
A shaped object comprising a borosilicate glass composition according to claim 1.
Claim 7
Dependent Claim
16 words
A shaped object according to claim 5 in the form of an article of laboratory glassware.
Claim 8
Dependent Claim
15 words
A shaped object according to claim 5 in the form of a container for liquids.
Claim 9
Dependent Claim
20 words
A borosilicate glass composition according to claim 1 wherein the tin is present in a concentration of 0.05-0.2 wt. %.
Claim 10
Dependent Claim
20 words
A borosilicate glass composition according to claim 5 wherein the tin is present in a concentration of 0.05-0.2 wt. %.
Claim 11
Dependent Claim
20 words
A borosilicate glass composition according to claim 6 wherein the tin is present in a concentration of 0.05-0.2 wt. %.
Claim 12
Dependent Claim
20 words
A borosilicate glass composition according to claim 7 wherein the tin is present in a concentration of 0.05-0.2 wt. %.
Claim 13
Dependent Claim
14 words
A borosilicate glass composition according to claim 1 of the following wt. % composition:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |