US4170527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of electrolytic manganese dioxide
Assignee: ELECTRODE Corp A DE CORP
•
Filing: 1978-10-27
•
Granted: 1979-10-09
•
Expires: 1998-10-27
Abstract
Abstract In the production of electrolytic manganese dioxide, the anodically-deposited product is removed by cathodically polarizing the electrode, possibly assisted by impact or vibration. Typically, the current is reversed periodically when the deposit is about 100-1500μ thick and shortly after current reversal, the product peels off as flake-like particles which can easily be ground to form a battery de-polarizer. An apparatus for use in carrying out the removal of the desired product from electrodes is disclosed and illustrated.
Inventors
- 👤 Henri B. Beer
- 👤 Theo L. H. Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:16
CPC Classifications
C; C25; C25B; C25B15/00; C08; C08L; C08L69/00; C25B1/00; C25B1/01; C25B1/21
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
30 words
In the manufacture of electrolytic manganese dioxide (EMD), a method of detaching the EMD from an electrode on which it has been anodically deposited, characterized by cathodically polarizing said electrode.
Claim 2
Dependent Claim
30 words
In the manufacture of electrolytic manganese dioxide (EMD), a method of detaching the EMD from an electrode on which it has been anodically deposited, characterized by cathodically polarizing said electrode.
Claim 3
Dependent Claim
36 words
The method of claim 1, characterized in that the current is passed through the cathodically polarized electrode at a current density of at least 100 A/m 2 to detach a substantial part of the deposited EMD.
Claim 4
Dependent Claim
23 words
The method of claim 2, characterized in that the current density during removal of the EMD is at least 500 A/m 2 .
Claim 5
Dependent Claim
38 words
The method of claim 1, characterized in that the deposited EMD is contacted with electrolyte so as to impregnate the EMD deposit with electrolyte before the electrode is cathodically polarized in order to effect removal of the EMD.
Claim 6
Dependent Claim
24 words
The method of claim 1, 2, 3 or 4, characterized in that removal of the EMD deposit is assisted by impact or by vibration.
Claim 7
Dependent Claim
63 words
In the manufacture of electrolytic manganese dioxide (EMD) by electrolyzing a manganese-containing aqueous electrolyte between electrodes, to deposit EMD on the electrode(s) acting as anode, and detaching the EMD deposit from said electrode(s) in the form of a solid product for further processing, an improved method of detaching the EMD deposit from said electrode(s), the method being characterized by cathodically polarizing said electrode(s).
Claim 8
Dependent Claim
63 words
In the manufacture of electrolytic manganese dioxide (EMD) by electrolyzing a manganese-containing aqueous electrolyte between electrodes, to deposit EMD on the electrode(s) acting as anode, and detaching the EMD deposit from said electrode(s) in the form of a solid product for further processing, an improved method of detaching the EMD deposit from said electrode(s), the method being characterized by cathodically polarizing said electrode(s).
Claim 9
Dependent Claim
22 words
The method of claim 6, characterized in that the electrode(s) is or are cathodically polarized by short circuiting with the other electrode(s).
Claim 10
Dependent Claim
27 words
The method of claim 6, characterized in that the electrode(s) is or are cathodically polarized after a rest period during which the electrode(s) is or are disconnected.
Claim 11
Dependent Claim
23 words
The method of claim 6, 7 or 8, characterized in that removal of the EMD deposit is assisted by impact or by vibration.
Claim 12
Dependent Claim
50 words
A process of producing electrolytic manganese dioxide (EMD), comprising electrolyzing a manganese-containing aqueous electrolyte between electrodes to deposit EMD on the electrode(s) acting as anode, characterized by reversing the polarity of at least the electrode(s) connected as anode to detach a substantial part of the deposited EMD from said electrode(s).
Claim 13
Dependent Claim
50 words
A process of producing electrolytic manganese dioxide (EMD), comprising electrolyzing a manganese-containing aqueous electrolyte between electrodes to deposit EMD on the electrode(s) acting as anode, characterized by reversing the polarity of at least the electrode(s) connected as anode to detach a substantial part of the deposited EMD from said electrode(s).
Claim 14
Dependent Claim
19 words
The process of claim 10, characterized in that the polarity of the electrodes is reversed periodically at regular intervals.
Claim 15
Dependent Claim
31 words
The process of claim 11, characterized in that the polarity of the electrodes is reversed each time the anodic deposit reaches a thickness in the range from 50 to 1500 micron.
Claim 16
Dependent Claim
54 words
The process of claim 10, characterized in that the polarity of the electrodes is reversed after a given time during which an EMD deposit has built up on the anodically-polarized electrode(s) and is held reversed to detach the EMD deposit during a period shorter than said given time, whereupon the initial polarity is reinstated.
Claim 17
Dependent Claim
29 words
The process of claim 10, characterized in that the polarity of all the electrodes is reversed in order to detach the deposited EMD from said electrodes acting as anode.
Claim 18
Dependent Claim
38 words
The process of claim 10, characterized in that the polarity of only the or those electrode(s) connected as anode to deposit EMD thereon is reversed using one or more auxiliary electrodes connected as anode during the removal phase.
Claim 19
Dependent Claim
26 words
The process of claim 10, characterized in that the electrodes are supplied at substantially constant voltage to produce a current peak at the moment of reversal.
Claim 20
Dependent Claim
37 words
The process of claim 10, characterized in that electrolytic deposition of EMD is discontinued for a rest period when the anodic deposit has reached a given thickness and is resumed with reversed polarity after the rest period.
Claim 21
Dependent Claim
35 words
The process of claim 17, characterized in that the electrode(s) connected as anode for the deposition of EMD thereon is or are short-circuited during the rest period, with the electrode(s) which were connected as cathode.
Claim 22
Dependent Claim
29 words
The process of claim 10, 11, 12, 13, 14, 15, 16, 17 or 18, characterized in that removal of the EMD deposit is assisted by impact or by vibration.
Claim 23
Dependent Claim
15 words
Electrolytic manganese dioxide obtained by the method or process of claim 1, 6 or 10.
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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |