Patent US4224133A successfully refreshed from Google Patents.
US4224133A
Expired / Lapsed
US
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Cathode
Assignee: Resonac Holdings Corp
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Filing: 1977-12-07
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Granted: 1980-09-23
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Expires: 1997-12-07
Abstract
Abstract An improved cathode for the electrolysis of an aqueous solution of an alkali metal salt or water, the cathode having been plated in an electroless plating bath containing a salt of Ni, Co or Fe in the presence of a hypophosphite and as a reducing agent, a sulfur or selenium containing compound.
Inventors
- 👤 Shuji Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:46
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C23; C23C; C23C18/00; C23C18/16; C23C18/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A cathode for the electrolysis of an aqueous solution of an alkali metal salt or water, said cathode consisting of a plate, lattice or mesh of iron, nickel-plated iron or nickel, of which the surface is plated in an aqueous electroless plating bath consisting of an aqueous solution of an inorganic salt of nickel, cobalt or iron, an alkali metal salt of hypophosphorous acid and as a reducing agent, 0.01 to 0.02 mole, per liter of the plating bath, of a water-soluble sulfur or selenium containing compound.
Claim 2
Dependent Claim
87 words
A cathode for the electrolysis of an aqueous solution of an alkali metal salt or water, said cathode consisting of a plate, lattice or mesh of iron, nickel-plated iron or nickel, of which the surface is plated in an aqueous electroless plating bath consisting of an aqueous solution of an inorganic salt of nickel, cobalt or iron, an alkali metal salt of hypophosphorous acid and as a reducing agent, 0.01 to 0.02 mole, per liter of the plating bath, of a water-soluble sulfur or selenium containing compound.
Claim 3
Dependent Claim
28 words
The cathode of claim 1 in which the inorganic salt of nickel, cobalt or iron is selected from the sulfates, nitrates, carbonates, halides and cyanides of these metals.
Claim 4
Dependent Claim
43 words
The cathode of claim 1 in which the water-soluble sulfur or selenium containing compound is selected from the group consisting of alkali metal salts and ammonium salts of thiosulfuric acid, thiocyanic acid, sulfurous acid, dithionous acid and selenious acid, thiourea, and hydrazinium sulfate.
Claim 5
Dependent Claim
47 words
The cathode of claim 1 in which the aqueous electroless plating bath contains, per liter thereof, 0.02 to 0.3 mole of the inorganic salt of nickel, cobalt or iron, 0.01 to 0.2 mole of alkali metal hypophosphite, and 0.01 to 0.2 mole of the water-soluble reducing agent.
Claim 6
Dependent Claim
19 words
The cathode of claim 1 in which the aqueous electroless plating bath has a pH of 4 to 6.
Claim 7
Dependent Claim
23 words
The cathode of claim 1 in which the aqueous electroless plating bath is maintained at a temperature of about 50° to 100° C.
Claim 8
Dependent Claim
13 words
The cathode of claim 1 in which the plate is a perforated plate.
References Cited (Backward Citations)
US1818579A
Cited
GB785694A
Cited
US2929742A
Cited
US3354059A
Cited
FR1474163A
Cited
US4033835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |