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US4076597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming iron foil at high current densities
Assignee: Gould Electronics Inc
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Filing: 1976-12-06
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Granted: 1978-02-28
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Expires: 1996-12-06
Abstract
Abstract A method of electrolytically producing a sheet of iron foil is provided which utilizes a rotating drum cathode and a spaced apart anode. The anode is fashioned from an iron containing material which is capable of producing iron ions that are soluble in the ferrous chloride electrolyte.
Inventors
- 👤 Palliyil K. Subramanyan
- 👤 Mieczyslaw Paul Makowski
- 👤 Robert Joseph Setele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:12
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/20; C25D1/00; C25D1/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
A method of electrolytically producing a sheet of iron foil on a rotating drum cathode comprising the steps of: providing an iron containing anode spaced apart from a rotatably mounted drum cathode so as to form a gap between said cathode and said anode for containing electrolyte, said anode being capable of forming iron ions which are soluble in said electrolyte; flowing electrolyte between said cathode and said anode while maintaining the concentration of ferrous ion in said electrolyte within the range of from about 120 to less than about 162 grams per liter; maintaining the pH of said electrolyte at a value ranging from about 3.3 to about 4.7 to prevent said ferrous ions from precipitating; heating said electrolyte to a temperature in excess of ambient but below its boiling point; rotating at least a portion of said cathode through said electrolyte; passing direct electrical current between said cathode and anode at a cathode current density of at least about 800 amperes per square foot to cause iron to be deposited on said cathode; and removing said so-formed iron foil from said cathode.
Claim 2
Independent Claim
184 words
A method of electrolytically producing a sheet of iron foil on a rotating drum cathode comprising the steps of: providing an iron containing anode spaced apart from a rotatably mounted drum cathode so as to form a gap between said cathode and said anode for containing electrolyte, said anode being capable of forming iron ions which are soluble in said electrolyte; flowing electrolyte between said cathode and said anode while maintaining the concentration of ferrous ion in said electrolyte within the range of from about 120 to less than about 162 grams per liter; maintaining the pH of said electrolyte at a value ranging from about 3.3 to about 4.7 to prevent said ferrous ions from precipitating; heating said electrolyte to a temperature in excess of ambient but below its boiling point; rotating at least a portion of said cathode through said electrolyte; passing direct electrical current between said cathode and anode at a cathode current density of at least about 800 amperes per square foot to cause iron to be deposited on said cathode; and removing said so-formed iron foil from said cathode.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein said electrolyte is flowed between said anode and said cathode at a flow rate of from about 2 to about 10 feet per second.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said electrolyte is heated to a temperature ranging from about 100° to about 105° C.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said current density ranges from about 800 to about 3600 amperes per square foot.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein said electrolyte contains from about 120 to about 150 grams per liter of ferrous ions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |