Patent US4121979A successfully refreshed from Google Patents.
US4121979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal treatment
Assignee: Oxy Metal Industries Corp
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Filing: 1976-09-27
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Granted: 1978-10-24
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Expires: 1996-09-27
Abstract
Abstract A novel acidic etching bath composition is disclosed consisting of an acid e.g. sulphuric acid and an unsaturated alcohol e.g. but-2-ene-1,4,-diol, allyl alcohol, propargyl alcohol or but-2-yne-1,4-diol. Etching plating and enamelling procedures are disclosed for producing enamel coatings with improved adhesion to steel substrates.
Inventors
- 👤 Simon John Wake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:41
CPC Classifications
C; C23; C23D; C23D3/00; C25; C25F; C25F3/00; C25F3/02; C25F3/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
An electrolytic etching process for steel which does not result in objectionable formation of mercaptans in which the workpiece is made the anode and is immersed in a composition comprising from 20 to 600 g/l of sulfuric acid, from 0.01 to 10 g/l of an organic compound of up to 10 carbon atoms containing an alcoholic hydroxyl group and having aliphatic unsaturation and a d.c. current is passed through the workpiece using insoluble cathodes at a current density of 1-100 amps per sq. ft. to remove 0.1-10 grams per sq. ft. of metal from the workpiece surface.
Claim 2
Dependent Claim
97 words
An electrolytic etching process for steel which does not result in objectionable formation of mercaptans in which the workpiece is made the anode and is immersed in a composition comprising from 20 to 600 g/l of sulfuric acid, from 0.01 to 10 g/l of an organic compound of up to 10 carbon atoms containing an alcoholic hydroxyl group and having aliphatic unsaturation and a d.c. current is passed through the workpiece using insoluble cathodes at a current density of 1-100 amps per sq. ft. to remove 0.1-10 grams per sq. ft. of metal from the workpiece surface.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the organic compound is selected from the group consisting of allyl alcohol, propargyl alcohol, 2-butene-1,4 diol and 2-butyne-1,4 diol.
Claim 4
Dependent Claim
35 words
The process of claim 2 wherein the sulfuric acid concentration is in the range of from 20 to 200 g/l and the organic compound concentration is in the range of from 0.05 to 5 g/l.
Claim 5
Dependent Claim
37 words
The process of claim 3 wherein the composition additionally contains at least one agent selected from the group consisting of fluorocarbon wetting agents, 4-dodecyl-3,3' disulpho-1,1'-diphenyl ether, and their salts, in a concentration of at least 0.02 g/l.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the insoluble cathode is selected from the group consisting of lead or tin-lead alloy.
Claim 7
Dependent Claim
37 words
The process of claim 1 wherein the workpiece is subsequently rendered cathodic in the presence of an aqueous nickel electroplating bath to cause deposition of nickel thereon in an amount of at least 40 mg/ft 2 .
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein the workpiece containing a nickel deposit thereon is subjected to vitreous enameling.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |