US4040935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective covering for electrolytic filter press cell frames
Assignee: BASF Corp
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Filing: 1975-04-11
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Granted: 1977-08-09
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Expires: 1995-04-11
Abstract
Abstract Electrolytic filter press cell frames are provided with a polymeric protective covering which is either directly laminated thereonto or otherwise secured thereto. The protective covering is, preferably, a fluorinated hydrocarbon.
Inventors
- 👤 Shyam D. Argade
- 👤 John J. Bortak
- 👤 Stephen M. Collins
- 👤 Eugene Y. Weissman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:25
CPC Classifications
C; C25; C25B; C25B9/00; C25B9/70; C25B9/73; C25B9/77; C25B9/75
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
76 words
In a bipolar electrolytic filter press cell of the type having a polypropylene cell frame interposed between adjacent electrodes, the bipolar cell having bipolar connectors for transmitting electrical energy to the cell, the improvement which comprises: a. a protective covering mounted to the cell frame the protective covering being chemically inert to the electrolytes, the covering being configured to the configuration of the cell frame, and b. means for mounting the covering to the cell frame.
Claim 2
Dependent Claim
76 words
In a bipolar electrolytic filter press cell of the type having a polypropylene cell frame interposed between adjacent electrodes, the bipolar cell having bipolar connectors for transmitting electrical energy to the cell, the improvement which comprises: a. a protective covering mounted to the cell frame the protective covering being chemically inert to the electrolytes, the covering being configured to the configuration of the cell frame, and b. means for mounting the covering to the cell frame.
Claim 3
Dependent Claim
26 words
The improvement of claim 1 wherein the protective covering comprises a film which is bonded to the cell frame, the bond defining the means for mounting.
Claim 4
Dependent Claim
64 words
The improvement of claim 1 wherein: a. the filter press cell is a chlor-alkali cell, the cell further comprising a diaphragm and a cell barrier formed integrally with the cell frame, the cell frame and barrier both being formed from polypropylene, the protective covering being interposed between the diaphragm and the cell barrier, and b. the protective covering consists essentially of a fluorinated hydrocarbon.
Claim 5
Dependent Claim
32 words
The improvement of claim 3 wherein the fluorinated hydrocarbon is selected from the group consisting of polytetrafluoroethylene, fluorinated ethylene-propylene copolymers, polychlorotrifluoroethylene, chlorotrifluoroethylene, polyvinylidenefluoride, polyethylenechlorotrifluoroethylene, polyethylenetetrafluoroethylene, tetrafluoroethylene-perfluorovinylether sulfonyl fluoride copolymers and mixtures thereof.
Claim 6
Dependent Claim
30 words
The improvement of claim 4 wherein the protective covering comprises a sheet formed to the same configuration as the cell barrier and is either polytetrafluoroethylene or a fluorinated ethylene-propylene copolymer.
Claim 7
Dependent Claim
23 words
The improvement of claim 5 wherein the sheet includes extended edges, the edges extending into the sealing area of the filter press cell.
Claim 8
Dependent Claim
33 words
The improvement of claim 4 wherein the protective covering comprises a film which is bonded to the cell barrier and the fluorinated hydrocarbon consists essentially of a polytetrafluoroethylene film on a vinyl substrate.
Claim 9
Dependent Claim
92 words
In a chlor-alkali bipolar electrolytic filter press cell of the type having a polypropylene cell frame, the cell frame having a central barrier, a diaphragm adjacent the central barrier and bipolar electrical connectors for transmitting electrical energy to the cell, the improvement which comprises: a. a protective covering mounted to the cell frame, the covering being configured to the configuration of the cell frame, the covering consisting essentially of a fluorinated hydrocarbon and being interposed between the diaphragm and the barrier, and b. means for mounting the covering to the cell frame.
Claim 10
Dependent Claim
92 words
In a chlor-alkali bipolar electrolytic filter press cell of the type having a polypropylene cell frame, the cell frame having a central barrier, a diaphragm adjacent the central barrier and bipolar electrical connectors for transmitting electrical energy to the cell, the improvement which comprises: a. a protective covering mounted to the cell frame, the covering being configured to the configuration of the cell frame, the covering consisting essentially of a fluorinated hydrocarbon and being interposed between the diaphragm and the barrier, and b. means for mounting the covering to the cell frame.
Claim 11
Dependent Claim
44 words
The improvement of claim 8 wherein: the covering is a sheet which is provided with a plurality of apertures, the apertures being coincident with the points of connection for the bipolar connector, the apertures and bipolar connectors cooperating to define the means for mounting.
Claim 12
Dependent Claim
20 words
The improvement of claim 9 wherein: the sheet has a thickness of from about five mils to about one-quarter inch.
Claim 13
Dependent Claim
25 words
The improvement of claim 8 wherein: the covering is a film, the film being bonded onto the barrier, the bonding defining the means for mounting.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |