Patent US3787305A successfully refreshed from Google Patents.
US3787305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of applying a coating to a part
Assignee: Rolls Royce PLC
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Filing: 1972-06-12
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Granted: 1974-01-22
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Expires: 1992-06-12
Abstract
Abstract The invention comprises a method of applying a coating to a steel part in which a coating of aluminium powder and organic resin is electrophoretically applied to the part, the coating is heated to drive off the resin, and the aluminium coating is impregnated with a high temperature resistant base material.
Inventors
- 👤 N Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:44
CPC Classifications
C; C25; C25D; C25D13/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
19 words
A method as claimed in claim 1 and in which the high temperature resistant base material is potassium silicate.
Claim 2
Dependent Claim
19 words
A method as claimed in claim 2 and comprising a further step in which the impregnated coating is stoved.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 3 and comprising a still further step in which the coating is heated to increase its electrical conductivity.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 4 and in which said subsequent heating comprises heating in air to 560*C for 2 hours.
Claim 5
Dependent Claim
17 words
A method as claimed in claim 1 and in which the organic resin comprises an acrylic resin.
Claim 6
Dependent Claim
19 words
A method as claimed in claim 1 and in which the electrophoretic coating is performed from an aqueous solution.
Claim 7
Dependent Claim
42 words
A method as claimed in claim 6 and in which the solution comprises from one to two parts by weight of an acrylic resin, from 2 to 20 parts by weight of fine powdered aluminum, and water to make the required consistency.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 7 and in which the electrophoretic coating is effected using a current density in the range 5 to 100 milliamps per square inch.
Claim 9
Dependent Claim
37 words
A method as claimed in claim 1 and in which the high temperature resistant base material is applied as an aqueous solution comprising one part by volume of potassium silicate and two parts by volume of water.
Claim 10
Dependent Claim
33 words
A method as claimed in claim 1 and in which a plurality of said electrophoretic coatings are applied and the resin burnt out, the multiple coating then being impregnated with the base material.
Claim 11
Dependent Claim
25 words
A method as claimed in claim 1 and comprising burning the resin out of the electrophoretically deposited coating by heating to a temperature of 560*C.
Claim 12
Dependent Claim
19 words
A method as claimed in claim 1 and in which the coating is finally stoved by heating to 150*C.
Claim 13
Independent Claim
92 words
A method of applying a high temperature and corrosion resistant coating to a steel part comprising the steps of: a. electrophoretically applying to the steel part a coating of a mixture of a major portion of aluminum powder and a minor portion of an acrylic resin; b. heating the thus-coated part to drive off the acrylic resin and diffuse the aluminum coating onto the steel part; c. cooling the thus-heated part; and d. impregnating the aluminum coating formed in steps (a) and (b) with the high temperature resistant base material potassium silicate.
References Cited (Backward Citations)
US3676308A
Cited
US3630869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |