US4154666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making fiber diaphragms
Assignee: BASF Corp
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Filing: 1978-07-14
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Granted: 1979-05-15
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Expires: 1998-07-14
Abstract
Abstract Diaphragms for electrolytic cells are prepared by depositing onto a cathode screen, discrete thermoplastic fibers. The fibers are highly branched, and when deposited, form an entanglement or network thereof, which does not require bonding or cementing.
Inventors
- 👤 Arvind S. Patil
- 👤 Eugene Y. Weissman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:18
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
107 words
A method of manufacturing a diaphragm for use in an electrolytic cell comprising (a) dispersing in an aqueous medium containing an effective amount of a surfactant to form a slurry about 1 to 15 percent by weight of a highly branched thermoplastic fiber, said fibers being capable of withstanding the internal conditions of the cell, the fibers being of the type produced by passing a polymer through a nozzle under high-energy conditions in the presence of an auxiliary liquid medium which shears the polymer into highly branched fibers, (b) depositing said slurry onto a cathode screen to form a diaphragm thereon, and (c) drying the deposited diaphragm.
Claim 2
Independent Claim
107 words
A method of manufacturing a diaphragm for use in an electrolytic cell comprising (a) dispersing in an aqueous medium containing an effective amount of a surfactant to form a slurry about 1 to 15 percent by weight of a highly branched thermoplastic fiber, said fibers being capable of withstanding the internal conditions of the cell, the fibers being of the type produced by passing a polymer through a nozzle under high-energy conditions in the presence of an auxiliary liquid medium which shears the polymer into highly branched fibers, (b) depositing said slurry onto a cathode screen to form a diaphragm thereon, and (c) drying the deposited diaphragm.
Claim 3
Dependent Claim
31 words
A method as defined in claim 1, wherein said aqueous medium is a mixture of water and acetone, which are present in a volumetric ratio of water:acetone of 0.5:1 to 1.0:0.5.
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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) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |