Patent US4582727A successfully refreshed from Google Patents.
US4582727A
Expired / Lapsed
US
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Varnish-bonded, carbon-coated metal products
Assignee: AMAX MAGNESIUM Corp A CORP OF
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Filing: 1984-03-20
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Granted: 1986-04-15
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Expires: 2004-03-20
Abstract
Abstract Metal substrates with a protective coating are provided, the coating being formed of a varnish-bonded, carbon-containing layer adherently bonded to the metal substrate. Optionally, the coating may also contain a dispersion of finely divided material selected from the group consisting of certain metal oxides and carbonates.
Inventors
- 👤 Ramaswami Neelameggham
- 👤 John C. Priscu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:19
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; C; C09; C09D; C09D5/00; C09D5/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
A process for producing a varnish-bonded, carbon-coated metal substrate which comprises: providing a metal substrate with a polymerizable oil coating on the surface thereof containing a dispersion of finely divided material selected from the group consisting of oxides and carbonates of the alkaline earth metal, magnesium oxide, aluminum oxide and titanium oxide ranging from about 5% to 50% by weight, heating said oil-coated metal substrate with the finely divided material dispersed therethrough to a polymerizing temperature below the melting point of said metal substrate under substantially non-oxidizing conditions to form a varnish coating on said substrate, and then raising the temperature of said varnish-coated substrate to a decomposition temperature below the melting point of the metal substrate to effect at least a partial conversion of said varnish to carbon and thereby produce a carbon coating strongly bonded to said substrate by means of said varnish containing said finely dispersed material.
Claim 2
Dependent Claim
150 words
A process for producing a varnish-bonded, carbon-coated metal substrate which comprises: providing a metal substrate with a polymerizable oil coating on the surface thereof containing a dispersion of finely divided material selected from the group consisting of oxides and carbonates of the alkaline earth metal, magnesium oxide, aluminum oxide and titanium oxide ranging from about 5% to 50% by weight, heating said oil-coated metal substrate with the finely divided material dispersed therethrough to a polymerizing temperature below the melting point of said metal substrate under substantially non-oxidizing conditions to form a varnish coating on said substrate, and then raising the temperature of said varnish-coated substrate to a decomposition temperature below the melting point of the metal substrate to effect at least a partial conversion of said varnish to carbon and thereby produce a carbon coating strongly bonded to said substrate by means of said varnish containing said finely dispersed material.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein the polymerizing temperature ranges from over about 20° C. to 250° C.
Claim 4
Dependent Claim
16 words
The process of claim 2, wherein the temperature ranges from about 100° C. to 175° C.
Claim 5
Dependent Claim
55 words
The process of claim 1, wherein the polymerized layer with the finely divided material dispersed therein is produced by applying the oil and polymerizing the layer and repeating the steps of applying the oil layer and polymerizing it until a varnish layer of desired thickness is obtained containing a dispersion of said finely divided material.
Claim 6
Dependent Claim
30 words
The process of claim 2, wherein following polymerization, the coated metal substrate is heated to a decomposition temperature of said oil coating ranging from about 250° C. to 350° C.
Claim 7
Dependent Claim
21 words
The process of claim 1, wherein the metal substrate is formed of a metal of melting point of over 350° C.
Claim 8
Dependent Claim
12 words
The process of claim 2, wherein the oil employed is vegetable oil.
Claim 9
Dependent Claim
12 words
The process of claim 7, wherein the vegetable oil is corn oil.
Claim 10
Dependent Claim
132 words
A process for producing a varnish-bonded, carbon-coated metal substrate which comprises: providing a metal substrate with a polymerizable oil coating on the surface thereof containing a dispersion of finely divided metal oxide ranging from about 5% to 50% by weight, heating said oil-coated metal substrate with the finely divided metal oxide dispersed therethrough to a polymerizing temperature below the melting point of said metal substrate under substantially non-oxidizing conditions to form a varnish coating on said substrate, and then raising the temperature of said varnish-coated substrate to a decomposition temperature below the melting point of the metal substrate to effect at least a partial conversion of said varnish to carbon and thereby produce a carbon coating strongly bonded to said substrate by means of said varnish containing said finely dispersed metal oxide.
Claim 11
Dependent Claim
132 words
A process for producing a varnish-bonded, carbon-coated metal substrate which comprises: providing a metal substrate with a polymerizable oil coating on the surface thereof containing a dispersion of finely divided metal oxide ranging from about 5% to 50% by weight, heating said oil-coated metal substrate with the finely divided metal oxide dispersed therethrough to a polymerizing temperature below the melting point of said metal substrate under substantially non-oxidizing conditions to form a varnish coating on said substrate, and then raising the temperature of said varnish-coated substrate to a decomposition temperature below the melting point of the metal substrate to effect at least a partial conversion of said varnish to carbon and thereby produce a carbon coating strongly bonded to said substrate by means of said varnish containing said finely dispersed metal oxide.
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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |