US4740280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolyte for electrochemically polishing metal surfaces
Assignee: POLIGRAT-HOLDING GmbH
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Filing: 1987-06-18
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Granted: 1988-04-26
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Expires: 2007-06-18
Abstract
Abstract The electrolyte according to the invention for electrochemically polishing articles made of steel, stainless steel, nickel alloys, aluminum, and aluminum alloys, and containing phosphoric acid and sulfuric acid comprises an addition of a chelating agent on the basis of phosphonic acids and, if desired, a stabilizer for the latter.
Inventors
- 👤 Friedrich Ruhstorfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:00
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/18; C25F3/20; C25F3/22; C25F3/24
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
38 words
An electrolyte for electrochemically polishing articles made of steel, stainless steel, nickel alloys, aluminum and aluminum alloys, and said electrolyte comprising a bath of phosphoric acid, sulfuric acid, and a chelating agent on the basis of phosphonic acids.
Claim 2
Dependent Claim
38 words
An electrolyte for electrochemically polishing articles made of steel, stainless steel, nickel alloys, aluminum and aluminum alloys, and said electrolyte comprising a bath of phosphoric acid, sulfuric acid, and a chelating agent on the basis of phosphonic acids.
Claim 3
Dependent Claim
19 words
The electrolyte as claimed in claim 1, wherein said bath contains from 1 to 100 g/l of chelating agent.
Claim 4
Dependent Claim
14 words
The electrolyte as claimed in claim 1, wherein said chelating agent is morpholinomethane-diphosphonic acid.
Claim 5
Dependent Claim
14 words
The electrolyte as claimed in claim 2, wherein said chelating agent is morpholinomethane-diphosphonic acid.
Claim 6
Dependent Claim
18 words
The electrolyte as claimed in claim 1, wherein said bath additionally contains a stabilizer for said phosphonic acid.
Claim 7
Dependent Claim
19 words
The electrolyte as claimed in claim 5, wherein said bath contains from 0.5 to 2% by weight of stabilizer.
Claim 8
Dependent Claim
13 words
The electrolyte as claimed in claim 6, wherein said stabilizer includes nitrilotriacetic acid.
Claim 9
Dependent Claim
13 words
The electrolyte as claimed in claim 6, wherein said stabilizer includes sodium glucoheptonate.
Claim 10
Dependent Claim
13 words
The electrolyte as claimed in claim 5, wherein said stabilizer includes nitrilotriacetic acid.
Claim 11
Dependent Claim
13 words
The electrolyte as claimed in claim 5, wherein said stabilizer includes sodium glucoheptonate.
Claim 12
Dependent Claim
18 words
The electrolyte as claimed in claim 2, wherein said bath additionally contains a stabilizer for said phosphonic acid.
Claim 13
Dependent Claim
19 words
The electrolyte as claimed in claim 11, wherein said bath contains from 0.5 to 2% by weight of stabilizer.
Claim 14
Dependent Claim
18 words
The electrolyte as claimed in claim 3, wherein said bath additionally contains a stabilizer for said phosphonic acid.
Claim 15
Dependent Claim
19 words
The electrolyte as claimed in claim 13, wherein said bath contains from 0.5 to 2% by weight of stabilizer.
Claim 16
Dependent Claim
13 words
The electrolyte as claimed in claim 13, wherein said stabilizer includes nitrilotriacetic acid.
Claim 17
Dependent Claim
13 words
The electrolyte as claimed in claim 13, wherein said stabilizer includes sodium glucoheptonate.
Claim 18
Dependent Claim
18 words
The electrolyte as claimed in claim 4, wherein said bath additionally contains a stabilizer for said phosphonic acid.
Claim 19
Dependent Claim
19 words
The electrolyte as claimed in claim 17, wherein said bath contains from 0.5 to 2% by weight of stabilizer.
Claim 20
Dependent Claim
13 words
The electrolyte as claimed in claim 17, wherein said stabilizer includes nitrilotriacetic acid.
Claim 21
Dependent Claim
13 words
The electrolyte as claimed in claim 17, wherein said stabilizer includes sodium glucoheptonate.
References Cited (Backward Citations)
US4626328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |