US4049841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sprayed cathodes
Assignee: BASF Corp
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Filing: 1975-09-08
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Granted: 1977-09-20
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Expires: 1995-09-08
Abstract
Abstract A ferrous metal cathode used in a chlor-alkali electrolytic cell has a metallic coating deposited thereon. The metallic coating is applied by either flame spraying or plasma spraying a powdered metal onto the ferrous metal surface. The metals which are utilized are those having a lower hydrogen overvoltage than iron.
Inventors
- 👤 Thomas G. Coker
- 👤 Shyam D. Argade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:39
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/075; C25B11/091
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
In a method for manufacturing a chlor-alkali electrolytic cell wherein the cathode is prepared by coating a ferrous metal substrate with a metal, the improvement comprising: spray coating the ferrous metal substrate with a powder metal to bond the powder metal to the substrate the powder metal having a lower hydrogen overvoltage than the substrate, the powder metal increasing the surface area of the cathode while maintaining efficient hydrogen bubble release.
Claim 2
Dependent Claim
71 words
In a method for manufacturing a chlor-alkali electrolytic cell wherein the cathode is prepared by coating a ferrous metal substrate with a metal, the improvement comprising: spray coating the ferrous metal substrate with a powder metal to bond the powder metal to the substrate the powder metal having a lower hydrogen overvoltage than the substrate, the powder metal increasing the surface area of the cathode while maintaining efficient hydrogen bubble release.
Claim 3
Dependent Claim
20 words
The improvement of claim 1 wherein the substrate is spray coated by flame spraying the powder metal onto the substrate.
Claim 4
Dependent Claim
20 words
The improvement of claim 1 wherein the substrate is spray coated by plasma spraying the powder metal onto the substrate.
Claim 5
Dependent Claim
36 words
The improvement of claim 1 wherein the powder metal is selected from the group consisting of cobalt, nickel, platinum, molybdenum, tungsten, manganese, iron, tantalum, niobium, carbides thereof, nitrides thereof, aluminides thereof, alloys thereof and mixtures thereof.
Claim 6
Dependent Claim
23 words
The improvement of claim 4 wherein the powder metal is selected from the group consisting of nickel, cobalt, tungsten carbide and mixtures thereof.
Claim 7
Dependent Claim
19 words
The improvement of claim 1 wherein the coating has a thickness of from about 0.001 to about 0.006 inches.
Claim 8
Dependent Claim
71 words
In a method for manufacturing a chlor-alkali electrolytic cell wherein the cathode is prepared by coating a ferrous metal substrate with a metal, the improvement comprising: flame spraying the ferrous metal substrate with a powder metal to bond the powder metal to the substrate, the powder metal having a lower hydrogen overvoltage than the substrate, the powder metal increasing the surface area of the cathode while maintaining efficient hydrogen bubble release.
Claim 9
Dependent Claim
71 words
In a method for manufacturing a chlor-alkali electrolytic cell wherein the cathode is prepared by coating a ferrous metal substrate with a metal, the improvement comprising: flame spraying the ferrous metal substrate with a powder metal to bond the powder metal to the substrate, the powder metal having a lower hydrogen overvoltage than the substrate, the powder metal increasing the surface area of the cathode while maintaining efficient hydrogen bubble release.
Claim 10
Dependent Claim
71 words
In a method for manufacturing a chlor-alkali electrolytic cell wherein the cathode is prepared by coating a ferrous metal substrate with a metal, the improvement comprising: plasma spraying the ferrous metal substrate with a powder metal to bond the powder metal to the substrate, the powder metal having a lower hydrogen overvoltage than the substrate, the powder metal increasing the surface area of the cathode while maintaining efficient hydrogen bubble release.
Claim 11
Dependent Claim
71 words
In a method for manufacturing a chlor-alkali electrolytic cell wherein the cathode is prepared by coating a ferrous metal substrate with a metal, the improvement comprising: plasma spraying the ferrous metal substrate with a powder metal to bond the powder metal to the substrate, the powder metal having a lower hydrogen overvoltage than the substrate, the powder metal increasing the surface area of the cathode while maintaining efficient hydrogen bubble release.
Claim 12
Dependent Claim
81 words
In a method for manufacturing a chlor-alkali electrolytic cell wherein the cathode is prepared by coating a ferrous metal substrate with a metal, the improvement comprising: spray coating onto the ferrous metal substrate a powder metal to bond the powder metal, the powder metal having a lower hydrogen overvoltage than the substrate, the coating having a thickness ranging from about 0.001 to about 0.006 inches, the powder metal increasing the surface area of the cathode while maintaining efficient hydrogen bubble release.
Claim 13
Dependent Claim
81 words
In a method for manufacturing a chlor-alkali electrolytic cell wherein the cathode is prepared by coating a ferrous metal substrate with a metal, the improvement comprising: spray coating onto the ferrous metal substrate a powder metal to bond the powder metal, the powder metal having a lower hydrogen overvoltage than the substrate, the coating having a thickness ranging from about 0.001 to about 0.006 inches, the powder metal increasing the surface area of the cathode while maintaining efficient hydrogen bubble release.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |