US3927243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminium enamels
Assignee: Oberschwaebische Metallwarenfabrik GmbH and Co KG
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Filing: 1973-04-11
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Granted: 1975-12-16
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Expires: 1993-04-11
Abstract
Abstract In an enamel for aluminium containing SiO2, TiO2 and alkali metal oxide, bismuth oxide is used for dissolving the TiO2 instead of conventional materials such as CdO, ZnO, BaO, SrO and PbO.
Inventors
- 👤 Gunter Theisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:45
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; C; C03; C03C; C03C8/00; C03C8/02; C03C2207/00; C03C2207/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
A METHOD FOR PRODUCING IMPROVED ENAMELED ALUNINIUM FOOD HANDLING ARTICLES COMPRISING: PREPARING AN ALUMINIUM ENAMEL COATING COMPOSITION CONSISTING ESSENTIALLY OF SIO2, TIO2, AT LEAST ONE R2O COMPOUND, WHEREIN R IS AN ALKALI METAL AND A QUANTITY OF COATING A FOOD CONTACTING SURFACE OF AN ALUMINIUM FOOD HANDLING ARTICLE WITH SAID COMPOSITION.
Claim 2
Independent Claim
51 words
A METHOD FOR PRODUCING IMPROVED ENAMELED ALUNINIUM FOOD HANDLING ARTICLES COMPRISING: PREPARING AN ALUMINIUM ENAMEL COATING COMPOSITION CONSISTING ESSENTIALLY OF SIO2, TIO2, AT LEAST ONE R2O COMPOUND, WHEREIN R IS AN ALKALI METAL AND A QUANTITY OF COATING A FOOD CONTACTING SURFACE OF AN ALUMINIUM FOOD HANDLING ARTICLE WITH SAID COMPOSITION.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein said coating composition also includes at least one oxide selected from the group consisting of B2O3, Al2O3, SnO2, CoO, NiO, MnO, CuO and FeO.
Claim 4
Dependent Claim
39 words
The method of claim 1 wherein said coating composition contains from 25 to 50 weight percent SiO2, from 10 to 35 weight percent TiO2, from 20 to 40 weight percent R2O and from 2 to 15 weight percent Bi2O3.
Claim 5
Dependent Claim
78 words
The method of claim 3 wherein said coating composition also includes at least one oxide selected from the group consisting of from 0 to 10 weight percent B2O3, from 0 to 7 weight percent Al2O3, from 0 to 15 weight percent SnO2, from 0 to 5 weight percent CoO, from 0 to 5 weight percent NiO, from 0 to 5 weight percent MnO, from 0 to 5 weight percent CuO and from 0 to 5 weight percent FeO.
Claim 6
Dependent Claim
56 words
An enameled aluminium kitchenware article consisting essentially of: an aluminium Substrate presenting a food handling article having a food contacting surface; and an enamel coating on said surface, said coating consisting essentially of SiO2, TiO2, at least one R2O compound, wherein R is an alkali metal, and a quantity of Bi2O3 sufficient to dissolve the TiO2.
Claim 7
Dependent Claim
56 words
An enameled aluminium kitchenware article consisting essentially of: an aluminium Substrate presenting a food handling article having a food contacting surface; and an enamel coating on said surface, said coating consisting essentially of SiO2, TiO2, at least one R2O compound, wherein R is an alkali metal, and a quantity of Bi2O3 sufficient to dissolve the TiO2.
Claim 8
Dependent Claim
32 words
An article as set forth in claim 5 wherein said coating also includes at least one oxide selected from the group consisting of B2O3, Al2O3, SnO2, CoO, NiO, MnO, CuO, and FeO.
Claim 9
Dependent Claim
41 words
An article as set forth in claim 5 wherein said coating contains from 25 to 50 weight percent SiO2, from 10 to 35 weight percent TiO2, from 20 to 40 weight percent R2O and from 2 to 15 weight percent Bi2O3.
Claim 10
Dependent Claim
80 words
An article as set forth in claim 7 wherein said coating also includes at least one oxide selected from the group consisting of from 0 to 10 weight percent B2O3, from 0 to 7 weight percent Al2O3, from 0 to 15 weight percent SnO2, from 0 to 5 weight percent CoO, from 0 to 5 weight percent NiO, from 0 to 5 weight percent MnO, from 0 to 5 weight percent CuO and from 0 to 5 weight percent FeO.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |