US4411751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of anodically deburring articles of steel or aluminium alloys in an electrolytic bath, and a bath for carrying out the method
Assignee: Individual
•
Filing: 1982-01-15
•
Granted: 1983-10-25
•
Expires: 2002-01-15
Abstract
Abstract Articles of steel or aluminium alloy are anodically deburred in an acid solution (pH not above 6.5) containing ______________________________________ grams per liter ______________________________________ water 100 to 300 alkali sulphamate 50 to 150 polyhydric alcohol 400 to 800 alkali nitrate 50 to 150 alkali chloride 50 to 150. ______________________________________
Inventors
- 👤 Karl-Ingemar Blomsterberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:30
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; C25F3/04; C25F3/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
A method of anodically deburring articles of steel or aluminium alloys in an electrolytic bath containing, in addition to water, alkali sulphamate, at least one polyhydric alcohol and at least one soluble chloride, at a bath voltage of 5 to 30 volts and a current density of 2 to 50 amperes per square decimeter, carried out in an acid solution having a pH not exceeding 6.5 and containing ______________________________________
grams per liter
______________________________________
water 100 to 300
alkali sulphamate
50 to 150
polyhydric alcohol
400 to 800
alkali nitrate 50 to 150
alkali chloride 50 to 150.
______________________________________
Claim 2
Independent Claim
98 words
A method of anodically deburring articles of steel or aluminium alloys in an electrolytic bath containing, in addition to water, alkali sulphamate, at least one polyhydric alcohol and at least one soluble chloride, at a bath voltage of 5 to 30 volts and a current density of 2 to 50 amperes per square decimeter, carried out in an acid solution having a pH not exceeding 6.5 and containing ______________________________________
grams per liter
______________________________________
water 100 to 300
alkali sulphamate
50 to 150
polyhydric alcohol
400 to 800
alkali nitrate 50 to 150
alkali chloride 50 to 150.
______________________________________
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1, carried out in a solution the alkali salts of which consist at least predominantly of ammonium salts.
Claim 4
Dependent Claim
30 words
A method as claimed in claim 1 or 2, carried out in a solution having a total content of alkali sulphamate and alkali nitrate not exceeding 250 grams per liter.
Claim 5
Dependent Claim
19 words
A method as claimed in claim 1 carried out in a solution having a pH not lower than 5.
Claim 6
Dependent Claim
24 words
A method as claimed in claim 1, wherein the acidity of the solution is adjusted by the addition of nitric acid to the solution.
Claim 7
Dependent Claim
66 words
A bath for the anodic deburring of articles of steel or aluminium alloy having the following constituents: ______________________________________
grams per liter
______________________________________
water 100 to 300
alkali sulphamate
50 to 150
polyhydric alcohol
400 to 800
alkali nitrate 50 to 150
alkali chloride 50 to 150
______________________________________ and free acid in the quantity required to adjust the pH of the bath to not more than 6.5.
Claim 8
Dependent Claim
66 words
A bath for the anodic deburring of articles of steel or aluminium alloy having the following constituents: ______________________________________
grams per liter
______________________________________
water 100 to 300
alkali sulphamate
50 to 150
polyhydric alcohol
400 to 800
alkali nitrate 50 to 150
alkali chloride 50 to 150
______________________________________ and free acid in the quantity required to adjust the pH of the bath to not more than 6.5.
Claim 9
Dependent Claim
20 words
A bath as claimed in claim 6 wherein the alkali salts contained therein consist at least predominantly of ammonium salts.
Claim 10
Dependent Claim
26 words
A bath as claimed in claim 6 or 7, wherein the total content of alkali sulphamate and alkali nitrate does not exceed 250 grams per liter.
Claim 11
Dependent Claim
16 words
A bath as claimed in claim 6 or 7, having a pH not lower than 5.
Claim 12
Dependent Claim
16 words
A bath as claimed in claim 6 or 7 having a content of free nitric acid.
References Cited (Backward Citations)
US3556957A
Cited
US4269677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |