US4555415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitreous enamels
Assignee: TI Group Services Ltd
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Filing: 1984-12-19
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Granted: 1985-11-26
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Expires: 2004-12-19
Abstract
Abstract A process for applying a vitreous enamel comprises applying a powdered vitreous frit to a metal, said frit having a water content of up to 0.03% by weight; this coated metal then being fired at a temperature in excess of the melting point of the frit, in a furnace having an atmosphere with a dew point of up to 10 DEG C. Metal particles may be admixed with the powdered frit to form a cermet or glass/metal composite. The powdered frit may be applied to a substrate as a non-aqueous slurry or an aqueous slurry including a polysaccharide based suspension agent.
Inventors
- 👤 John L. C. Mumford
- 👤 Roger F. Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:00
CPC Classifications
C; C23; C23D; C23D5/00; C23D1/00; C23D5/02; C23D9/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
62 words
A process for applying a vitreous enamel comprising; applying a powdered vitreous frit to a metal, said vitreous frit having a water content of up to 0.03% by weight; and then firing the coated metal at a temperature in excess of the melting point of the frit, in a furnace having an atmosphere with a dew point of up to 10° C.
Claim 2
Dependent Claim
62 words
A process for applying a vitreous enamel comprising; applying a powdered vitreous frit to a metal, said vitreous frit having a water content of up to 0.03% by weight; and then firing the coated metal at a temperature in excess of the melting point of the frit, in a furnace having an atmosphere with a dew point of up to 10° C.
Claim 3
Dependent Claim
33 words
A process according to claim 1 in which the frit has a water content of up to 0.015% by weight and the dew point of the furnace atmosphere is up to 10° C.
Claim 4
Dependent Claim
32 words
A process according to claim 1 in which the frit has a water content of up to 0.03% by weight and the dew point of the atmosphere is up to 5° C.
Claim 5
Dependent Claim
17 words
A process according to claim 1 in which powdered metal is admixed with the powdered vitreous frit.
Claim 6
Dependent Claim
20 words
A process according to claim 4 in which the powdered metal has a particle size of up to 200 microns.
Claim 7
Dependent Claim
22 words
A process according to claim 4 in which up to 60% by weight of powdered metal is added to the powdered frit.
Claim 8
Dependent Claim
22 words
A process according to claim 1 in which the metal is selected from iron, aluminium, magnesium, titanium, zirconium, silicon, and their alloys.
Claim 9
Dependent Claim
20 words
A process according to claim 1 in which the powdered vitreous enamel is applied as a coating to a substrate.
Claim 10
Dependent Claim
22 words
A process according to claim 8 in which the coating is applied to the substrate in the form of a non-aqueous slurry.
Claim 11
Dependent Claim
31 words
A process according to claim 8 in which the coating is applied to the substrate in the form of an aqueous slurry, said aqueous slurry including a polysaccharide based suspension agent.
Claim 12
Dependent Claim
16 words
A process according to claim 10 in which the aqueous slurry includes a cellulosic suspension agent.
Claim 13
Dependent Claim
15 words
A process according to claim 10 in which the suspension agent is a xanthan gum.
Claim 14
Dependent Claim
68 words
A process according to claim 8 in which a second coating of powdered vitreous frit is applied to the substrate, the frit in said second coating having a water content of up to 0.03% by weight, said second coating being fired at a temperature in excess of the melting point of the frit, in a furnace having an atmosphere with a dew point of up to 10° C.
Claim 15
Dependent Claim
29 words
A process according to claim 13 in which the second coating is applied before the first coating has been fired and the first and second coatings are fired simultaneously.
Claim 16
Dependent Claim
18 words
A process according to claim 1 in which powdered refactory material is admixed with the powdered vitreous frit.
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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |