US4031000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm for electrolytic production of caustic alkali
Assignee: Kureha Corp
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Filing: 1974-05-30
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Granted: 1977-06-21
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Expires: 1994-05-30
Abstract
Abstract A diaphragm for electrolytic production of caustic alkali which consists of dual microporous layers provided on the anode and cathode sides, wherein the anode side microporous layer is made of an acid-resistant material 0.01 to 0.3 millimeter thick bored with micropores having a mean diameter of 0.05 to 1.5 microns, and the cathode side microporous layer is formed of an alkali-resistant material 1 to 6 millimeters thick bored with micropores having a diameter of 3 to 100 microns.
Inventors
- 👤 Tadashi Nakamura
- 👤 Hisami Hagiwara
- 👤 Yoshikazu Kokubu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:38
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B7/00; B32B7/02; B32B27/30; B32B27/304; B32B27/32; B32B27/322; B32B7/04; B32B7/12; B32B9/00; B32B9/005; B32B9/04; B32B9/045; C; C25; C25B; C25B13/00; C25B13/02; B32B2305/00; B32B2305/02; B32B2305/026; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
In an electrolytic cell for producing an alkali hydroxide comprising a diaphragm dividing said cell into an anolyte chamber and a catholyte chamber, the improvement which comprises said diaphragm comprising a dual microporous layer having an anode side and a cathode side, the anode side microporous layer thereof being made of an acid-resistant material 0.01 to 0.3 millimeter thick bored with micropores having a mean diameter of from 0.05 to 1.5 microns, and the cathode side microporous layer thereof being made of an alkali-resistant material 1 to 6 millimeters thick bored with micropores having a mean diameter of from 3 to 100 microns.
Claim 2
Dependent Claim
103 words
In an electrolytic cell for producing an alkali hydroxide comprising a diaphragm dividing said cell into an anolyte chamber and a catholyte chamber, the improvement which comprises said diaphragm comprising a dual microporous layer having an anode side and a cathode side, the anode side microporous layer thereof being made of an acid-resistant material 0.01 to 0.3 millimeter thick bored with micropores having a mean diameter of from 0.05 to 1.5 microns, and the cathode side microporous layer thereof being made of an alkali-resistant material 1 to 6 millimeters thick bored with micropores having a mean diameter of from 3 to 100 microns.
Claim 3
Dependent Claim
26 words
The electrolytic cell of claim 1, wherein the acid-resistant material is a resin selected from the group consisting of chlorinated polyvinyl chloride and chlorinated polyvinylidene chloride.
Claim 4
Dependent Claim
36 words
The electrolytic cell of claim 1, wherein the alkali-resistant material is a resin selected from the group consisting of polytrifluoroethylene, polytetrafluoroethylene, polyvinylidene fluoride, a tetrafluoroethylene-hexafluoroethylene copolymer, and ethylene-tetrafluoroethylene copolymer, an ethylene copolymer and a tetrafluoroethylene-perfluoroacrylate copolymer.
Claim 5
Dependent Claim
56 words
The electrolytic cell of claim 1, wherein the acid-resistant material is a resin selected from the group consisting of chlorinated polyvinyl chloride and chlorinated polyvinylidene chloride, and the alkali-resistant material is a resin selected from the group consisting of polytrifluoroethylene, polytetrafluoroethylene, polyvinylidene fluoride, a tetrafluoroethylene-hexafluoroethylene copolymer, an ethylene-tetrafluoroethylene copolymer, an ethylene copolymer and a tetrafluoroethylene-perfluoroacrylate copolymer.
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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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |