US4269677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anodic deburring or brightening of steel articles
Assignee: Individual
•
Filing: 1980-02-15
•
Granted: 1981-05-26
•
Expires: 2000-02-15
Abstract
Abstract Anodic deburring or brightening of steel articles is carried out in an alkaline solution containing, per liter of the solution, at least 200 grams of water, at least 300 grams of polyhydric alcohol and at least 200 grams of alkali sulphamate.
Inventors
- 👤 Karl-Ingemar Blomsterberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:05
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/22; C25F3/24; C25F3/02; C25F3/06; Y; Y10; Y10S; Y10S204/00; Y10S204/09
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
A method of electrolytically deburring or polishing a steel article which comprises subjecting said article as the anode to the action of a direct current in an electrolyte at an anode-cathode voltage between 4 and 25 volts and a current density between 2 and 50 amperes per square decimeter, said electrolyte consisting of an alkaline watery solution composed essentially of at least one polyhydric alcohol, alkali sulphamate and water in the following proportions: ______________________________________
Grams per liter of the solution:
______________________________________
Polyhydric alcohol
At least 300
Alkali sulphamate
At least 200
Water At least 200.
______________________________________
Claim 2
Independent Claim
96 words
A method of electrolytically deburring or polishing a steel article which comprises subjecting said article as the anode to the action of a direct current in an electrolyte at an anode-cathode voltage between 4 and 25 volts and a current density between 2 and 50 amperes per square decimeter, said electrolyte consisting of an alkaline watery solution composed essentially of at least one polyhydric alcohol, alkali sulphamate and water in the following proportions: ______________________________________
Grams per liter of the solution:
______________________________________
Polyhydric alcohol
At least 300
Alkali sulphamate
At least 200
Water At least 200.
______________________________________
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1 in which the treatment is carried out in a solution containing, in addition to the components specified, a minor proportion of chloride.
Claim 4
Dependent Claim
31 words
A method as claimed in claim 1 or 2 in which the current is supplied during a plurality of successive periods separated by idle intervals during which no current is supplied.
Claim 5
Dependent Claim
52 words
A method as claimed in claim 1 or 2 in which the current is supplied during a plurality of periods, each of which has a duration of not less than 30 and not more than 60 seconds, separated by idle intervals each of which has a duration of 5 to 10 seconds.
Claim 6
Dependent Claim
22 words
A method as claimed in claim 1 in which the electrolyte bath is kept at a temperature of 20° to 30° centigrade.
Claim 7
Dependent Claim
21 words
A method as claimed in claim 1 in which the pH of the electrolyte bath is maintained between 9 and 12.
Claim 8
Dependent Claim
58 words
An electrolyte bath for the anodic deburring or polishing of a steel article consisting of an alkaline watery solution composed essentially of at least one polyhydric alcohol, alkali sulphamate and water in the following proportions: ______________________________________
Grams per liter of the solution:
______________________________________
Polyhydric alcohol
At least 300
Alkali sulphamate
At least 200
Water At least 200.
______________________________________
Claim 9
Dependent Claim
58 words
An electrolyte bath for the anodic deburring or polishing of a steel article consisting of an alkaline watery solution composed essentially of at least one polyhydric alcohol, alkali sulphamate and water in the following proportions: ______________________________________
Grams per liter of the solution:
______________________________________
Polyhydric alcohol
At least 300
Alkali sulphamate
At least 200
Water At least 200.
______________________________________
Claim 10
Dependent Claim
20 words
An electrolyte bath as claimed in claim 7 having an alkali content resulting in a pH between 9 and 12.
Claim 11
Dependent Claim
29 words
An electrolyte bath as claimed in claim 7 which additionally contains one or more soluble chlorides in a total quantity amounting to between 2 and 30 grams per liter.
Claim 12
Dependent Claim
42 words
An electrolyte bath for the anodic deburring or polishing of a steel article composed of ______________________________________
Parts by weight
______________________________________
Sodium sulphamate
500
Glycerol 700
Water 500
Sodium chloride 15
Alkali as required to provide a
pH between 9 and 12.
______________________________________
Claim 13
Dependent Claim
42 words
An electrolyte bath for the anodic deburring or polishing of a steel article composed of ______________________________________
Parts by weight
______________________________________
Sodium sulphamate
500
Glycerol 700
Water 500
Sodium chloride 15
Alkali as required to provide a
pH between 9 and 12.
______________________________________
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) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |