US4289601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm structure for electrolytic cells for the electrolysis of aqueous salt solutions
Assignee: Olin Corp
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Filing: 1979-11-30
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Granted: 1981-09-15
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Expires: 1999-11-30
Abstract
Abstract A diaphragm for electrolytic cells for the electrolysis of aqueous salt solutions is comprised of a porous portion and an impervious portion. The impervious portion is comprised of a fabric layer attached to an impervious film layer. A thermoplastic fabric material is used as the porous portion which is impregnated with a siliceous composition as the electrolytically active component.
Inventors
- 👤 Igor V. Kadija
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:23
CPC Classifications
C; C25; C25B; C25B13/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
A diaphragm for electrolytic cells for the electrolysis of aqueous salt solutions which comprises an electrochemically active porous portion attached to an electrochemically inactive fluid impervious portion, said electrochemically inactive fluid impervious portion being comprised of a fabric layer attached to a fluid impervious film layer.
Claim 2
Dependent Claim
46 words
A diaphragm for electrolytic cells for the electrolysis of aqueous salt solutions which comprises an electrochemically active porous portion attached to an electrochemically inactive fluid impervious portion, said electrochemically inactive fluid impervious portion being comprised of a fabric layer attached to a fluid impervious film layer.
Claim 3
Dependent Claim
24 words
The diaphragm of claim 1 in which said porous portion is comprised of a porous thermoplastic fabric impregnated with particles of a siliceous composition.
Claim 4
Dependent Claim
33 words
The diaphragm of claim 2 in which said fluid impervious film layer is comprised of a fluorinated olefin selected from the group consisting of polytetrafluoroethylene, fluorinated ethylene-propylene (FEP), polychlorotrifluoroethylene, polyvinylfluoride, and polyvinylidene fluoride.
Claim 5
Dependent Claim
24 words
The diaphragm of claim 3 in which said porous portion is a porous thermoplastic fabric comprised of a polyolefins, polyarylene sulfides, or mixtures thereof.
Claim 6
Dependent Claim
31 words
The diaphragm of claim 4 in which said polyolefin is selected from the group consisting of olefins having from 2 to about 6 carbon atoms and their chloro- and fluoro- derivatives.
Claim 7
Dependent Claim
16 words
The diaphragm of claim 4 in which said polyarylene sulfide is polyphenylene sulfide or polynaphthylene sulfide.
Claim 8
Dependent Claim
24 words
The diaphragm of claim 1 in which said fluid impervious layer is comprised of two fabric layers bonded to an intermediate impervious film layer.
Claim 9
Dependent Claim
17 words
The diaphragm of claim 7 in which said porous thermoplastic fabric is impregnated with a siliceous composition.
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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |