US4502931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of ion exchange membranes with coating for electrolysis
Assignee: De Nora Permelec Ltd
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Filing: 1983-04-07
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Granted: 1985-03-05
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Expires: 2003-04-07
Abstract
Abstract A process for the production of electrolytic ion exchange membranes with a coating, comprising coarsening the surface of an ion exchange membrane by an ion-etching treatment and, thereafter, coating the coarsened surface with a substance with a low electrochemical activity. The use of these ion exchange membranes greatly reduces the electrolytic voltage while maintaining a high current efficiency, and enables electrolysis to be performed in a stable manner over a long period of time.
Inventors
- 👤 Hiroshi Asano
- 👤 Takayuki Shimamune
- 👤 Kazuhiro Hirao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:31
CPC Classifications
C; C25; C25B; C25B9/00; C25B9/17; C25B9/19; C25B9/23; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C25B13/00; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
A process for the production of an ion exchange membrane with a coating thereon for use in electrolysis, comprising: (1) coarsening the surface of said ion exchange membrane by ion etching so that the etching depth ranges from about 0.1 to 20μ and, (2) thereafter, coating the thus-coarsened surface with a substance selected from the group consisting of carbon, graphite, and tantalum oxide.
Claim 2
Dependent Claim
63 words
A process for the production of an ion exchange membrane with a coating thereon for use in electrolysis, comprising: (1) coarsening the surface of said ion exchange membrane by ion etching so that the etching depth ranges from about 0.1 to 20μ and, (2) thereafter, coating the thus-coarsened surface with a substance selected from the group consisting of carbon, graphite, and tantalum oxide.
Claim 3
Dependent Claim
30 words
The process as claimed in claim 1, wherein the thickness, calculated as the smooth surface coating thickness, of the coating of the substance with ranges from about 0.05 to 5μ.
Claim 4
Dependent Claim
20 words
The process as claimed in claim 1, wherein the coating of the substance is performed by a vacuum sputter process.
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) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |