US4010042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing phosphosilicate coatings
Assignee: Allegheny Ludlum Corp
•
Filing: 1976-01-15
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Granted: 1977-03-01
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Expires: 1996-01-15
Abstract
Abstract A phosphosilicate coating is removed from a metallic substrate by contacting the coating with an aqueous solution containing an alkali metal fluoride. The solution is maintained in contact with the coating for a time sufficient to remove the coating without harming the substrate.
Inventors
- 👤 Charles D. Boyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:30
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/24; B; B08; B08B; B08B3/00; B08B3/04; B08B3/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A process for removing a phosphosilicate coating from a metallic substrate, without deleteriously affecting the substrate, comprising contacting the coating with an aqueous solution containing an alkali metal fluoride in a concentration effective to remove the phosphosilicate coating and maintaining said solution in contact with said coating for a time sufficient to remove the phosphosilicate coating without deleteriously affecting the substrate.
Claim 2
Dependent Claim
61 words
A process for removing a phosphosilicate coating from a metallic substrate, without deleteriously affecting the substrate, comprising contacting the coating with an aqueous solution containing an alkali metal fluoride in a concentration effective to remove the phosphosilicate coating and maintaining said solution in contact with said coating for a time sufficient to remove the phosphosilicate coating without deleteriously affecting the substrate.
Claim 3
Dependent Claim
16 words
A process as defined in claim 1 wherein the fluoride is sodium fluoride or potassium fluoride.
Claim 4
Dependent Claim
13 words
A process as defined in claim 1 wherein the fluoride is potassium fluoride.
Claim 5
Dependent Claim
33 words
A process as defined in claim 1 wherein the coating is contacted with the aqueous solution at a temperature within the range of 80° F up to the boiling point of the solution.
Claim 6
Dependent Claim
27 words
A process as defined in claim 1 wherein the aqueous solution contains the fluoride in a concentration ranging from 5% by weight up to the saturation concentration.
Claim 7
Dependent Claim
14 words
A process as defined in claim 1 wherein the substrate is a stainless steel.
Claim 8
Dependent Claim
23 words
A process as defined in claim 6 wherein the stainless steel substrate is a colored substrate which has been colored by controlled oxidation.
Claim 9
Dependent Claim
64 words
A process for removing a phosphosilicate coating from a stainless steel substrate, without deleteriously affecting the substrate, comprising contacting the coating with an aqueous solution containing potassium fluoride in a concentration effective to remove the phosphosilicate coating and maintaining said solution in contact with said coating for a time and at a temperature sufficient to remove the phosphosilicate coating without deleteriously affecting the substrate.
Claim 10
Dependent Claim
64 words
A process for removing a phosphosilicate coating from a stainless steel substrate, without deleteriously affecting the substrate, comprising contacting the coating with an aqueous solution containing potassium fluoride in a concentration effective to remove the phosphosilicate coating and maintaining said solution in contact with said coating for a time and at a temperature sufficient to remove the phosphosilicate coating without deleteriously affecting the substrate.
Claim 11
Dependent Claim
23 words
A process as defined in claim 8 wherein the stainless steel substrate is a colored substrate which has been colored by controlled oxidation.
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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |