US3849280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic cell including means for preventing atomic hydrogen attack of the titanium backplate member
Assignee: PPG Industries Inc
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Filing: 1973-03-01
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Granted: 1974-11-19
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Expires: 1993-03-01
Abstract
Abstract A novel bipolar unit for use in bipolar diaphragm cell electrolyzers is disclosed. Both members of the backplate of the bipolar unit-the anodic surface and the cathodic surface-are metallic. The backplate is particularly resistant to hydrogeninduced structural failure.
Inventors
- 👤 C Raetzsch
- 👤 W Darlington
- 👤 H Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:51
CPC Classifications
C; C25; C25B; C25B9/00; C25B9/70; C25B9/60; C25B9/63
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
AN ELECTROLYZER COMPRISING A PLURALITY OF BIPOLAR CELLS IN SERIES HAVING BIPOLAR UNITS, AT LEAST ONE OF SAID BIPOLAR UNITS COMPRISING: A BACKPLATE PROVIDING A BARRIER BETWEEN ADJACENT CELLS IN THE SERIES; A CATHODE EXTENDING FROM ONE SURFACE OF SAID BACKPLATE AND IN ELECTRICAL CONTACT THEREWITH; AND AN ANODE EXTENDING FROM THE OPPOSITE SURFACE OF SAID BACKPLATE AND IN ELECTRICAL CONTACT THEREWITH; SAID BACKPLATE COMPRISING: A CATHOLYTE-RESISTANT MEMBER HAVING TWO SURFACES; A VALVE METAL MEMBER BONDED TO THE SURFACE OF THE CATHOLYTE RESISTANT MEMBER OPPOSITE THE SURFACE FROM WHICH THE CATHODE EXTENDS; AND MEANS ON THE SURFACE OF THE CATHOLYTE RESISTANT MEMBER FROM WHICH THE CATHODE EXTENDS, INTERPOSED BETWEEN THE CATHODE AND THE CATHOLYTE RESISTANT MEMBER FOR PREVENTING THE MIGRATION OF ATOMIC HYDROGEN THROUGH THE CATHOLYTE RESISTANT MEMBER.
Claim 2
Dependent Claim
128 words
AN ELECTROLYZER COMPRISING A PLURALITY OF BIPOLAR CELLS IN SERIES HAVING BIPOLAR UNITS, AT LEAST ONE OF SAID BIPOLAR UNITS COMPRISING: A BACKPLATE PROVIDING A BARRIER BETWEEN ADJACENT CELLS IN THE SERIES; A CATHODE EXTENDING FROM ONE SURFACE OF SAID BACKPLATE AND IN ELECTRICAL CONTACT THEREWITH; AND AN ANODE EXTENDING FROM THE OPPOSITE SURFACE OF SAID BACKPLATE AND IN ELECTRICAL CONTACT THEREWITH; SAID BACKPLATE COMPRISING: A CATHOLYTE-RESISTANT MEMBER HAVING TWO SURFACES; A VALVE METAL MEMBER BONDED TO THE SURFACE OF THE CATHOLYTE RESISTANT MEMBER OPPOSITE THE SURFACE FROM WHICH THE CATHODE EXTENDS; AND MEANS ON THE SURFACE OF THE CATHOLYTE RESISTANT MEMBER FROM WHICH THE CATHODE EXTENDS, INTERPOSED BETWEEN THE CATHODE AND THE CATHOLYTE RESISTANT MEMBER FOR PREVENTING THE MIGRATION OF ATOMIC HYDROGEN THROUGH THE CATHOLYTE RESISTANT MEMBER.
Claim 3
Dependent Claim
58 words
The electrolyzer of claim 1 wherein the catholyte resistant member is a steel plate and the means for preventing the migration of atomic hydrogen through the steel plate comprises: a metal sheet parallel to, in juxtaposition with, spaced more than five angstroms from, and mechanically connected to the steel plate; and means for recovering molecular hydrogen formed therebetween.
Claim 4
Dependent Claim
28 words
The bipolar electrolyzer of claim 2 wherein the metal sheet is provided by a metal selected from the group consisting of copper, zinc, cadmium, lead, molybdenum, and steel.
Claim 5
Dependent Claim
51 words
The bipolar electrolyzer of claim 1 wherein the catholyte resistant metal is a steel plate and the means for preventing the migration of atomic hydrogen through the steel plate is a hydrogen barrier metal coating on the steel plate a metal having a lower atomic hydrogen permeability than the steel plate.
Claim 6
Dependent Claim
18 words
The bipolar electrolyzer of claim 4 wherein the hydrogen barrier metal coating is more than five micro-inches thick.
Claim 7
Dependent Claim
39 words
The bipolar electrolyzer of claim 4 wherein the metal in the hydrogen barrier metal coating is selected from the group consisting of vanadium, chromium, manganese, cobalt, nickel, copper, zinc, niobium, molybdenum, silver, cadmium, rhodium, tantalum, tungsten, iridium, and gold.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |