US4830894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of a paste containing precious metals for the production of browning dishes for microwave ovens
Assignee: Evonik Operations GmbH
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Filing: 1987-11-30
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Granted: 1989-05-16
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Expires: 2007-11-30
Abstract
Abstract Metal coatings for browning dishes to be used in microwave ovens are obtained by use of plastes of: (a) 50 to 80% by weight of a mixture of (aa) 5 to 70% by weight of a conductive component formed of 5 to 95% by weight ruthenium oxide, and the balance being at least one of silver, palladium, rhodium oxide and/or bismuth oxide, (bb) 30 to 95% by weight of a glass frit (b) 20 to 50% by weight of an organic binder. Coatings which are applied to glass, ceramic and/or vitreous ceramic dishes and cooking vessels are very adherent and in a few minutes reach temperatures of up to 300° C.
Inventors
- 👤 Guy Roche
- 👤 Gerard Labregere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:52
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/647; H05B6/6491; H05B6/6494; C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C8/00; C03C8/02; C03C8/04; C03C8/14; C03C8/18; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5072; C04B41/51; C04B41/5111; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C03C2209/00; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/23; C03C2218/00; C03C2218/10; C03C2218/15; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A browning vessel having a bottom surface, at least a portion of said bottom surface having adhered thereon as the sole coating a coating produced from a paste composition comprising: (a) 50 to 80% by weight of a mixture of (aa) 5 to 70% by weight of a conductive component formed of 5 to 95% by weight ruthenium oxide, and the balance being at least one of silver, palladium, rhodium oxide and/or bismuth oxide and mixtures thereof, (bb) 30 to 95% by weight of a glass frit (b) 20 to 50% by weight of an organic binder whereby said browning vessel functions to absorb microwave energy in a microwave oven so that the browning dish reaches a temperature of 300° in a relatively short time and leads a rapid browning of the food that is placed therein.
Claim 2
Dependent Claim
137 words
A browning vessel having a bottom surface, at least a portion of said bottom surface having adhered thereon as the sole coating a coating produced from a paste composition comprising: (a) 50 to 80% by weight of a mixture of (aa) 5 to 70% by weight of a conductive component formed of 5 to 95% by weight ruthenium oxide, and the balance being at least one of silver, palladium, rhodium oxide and/or bismuth oxide and mixtures thereof, (bb) 30 to 95% by weight of a glass frit (b) 20 to 50% by weight of an organic binder whereby said browning vessel functions to absorb microwave energy in a microwave oven so that the browning dish reaches a temperature of 300° in a relatively short time and leads a rapid browning of the food that is placed therein.
Claim 3
Dependent Claim
61 words
The browning vessel as in claim 1, in which the paste compositon contains a conductive component of 50 to 95% by weight ruthenium oxide, and at least one of 0 to 60% by weight silver, 0 to 30% by weight palladium and/or silver-palladium 0 to 10% by weight rhodium oxide and/or 0 to 10% by weight bismuth oxide as the remainder.
Claim 4
Dependent Claim
72 words
The browning vessel as in claim 1, wherei the glass frit has the following composition (Seeger formula): ______________________________________
Li.sub.2 O
0.2 to 0.7
ZnO 0.1 to 0.75
TiO.sub.2
0 to 0.2
Na.sub.2 O
0 to 0.2 Al.sub.2 O.sub.3
0.1 to 0.7
ZrO.sub.2
0 to 0.2
MgO 0 to 0.3 Cr.sub.2 O.sub.3
0 to 0.1 SnO.sub.2
0 to 0.3
CaO 0 to 0.4 B.sub.2 O.sub.3
0.5 to 1 F.sub.2
0 to 0.3
______________________________________
Claim 5
Independent Claim
110 words
A method of making a browning vessel for use in microwave cooking comprising coating at least part of the surface of a cooking vessel with a paste composition comprising (a) 50 to 80% by weight of a mixture of (aa) 5 to 70% by weight of a conductive component formed of 5 to 95% by weight ruthenium oxide, and the balance being at least one of silver, palladium, rhodium oxide and/or bismuth oxide and mixtures thereof, (bb) 30 to 95% by weight of a glass frit (b) 20 to 50% by weight of an organic binder and firing the coated vessel at a suitable temperature to form an adhered coating.
Claim 6
Independent Claim
110 words
A method of making a browning vessel for use in microwave cooking comprising coating at least part of the surface of a cooking vessel with a paste composition comprising (a) 50 to 80% by weight of a mixture of (aa) 5 to 70% by weight of a conductive component formed of 5 to 95% by weight ruthenium oxide, and the balance being at least one of silver, palladium, rhodium oxide and/or bismuth oxide and mixtures thereof, (bb) 30 to 95% by weight of a glass frit (b) 20 to 50% by weight of an organic binder and firing the coated vessel at a suitable temperature to form an adhered coating.
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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |