US4186076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite diaphragms
Assignee: De Nora SpA
•
Filing: 1979-02-22
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Granted: 1980-01-29
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Expires: 1999-02-22
Abstract
Abstract Porous and electrolyte permeable composite diaphragms for electrolysis cells comprising a chemically inert, fibrous porous matrix or substrate impregnated with a copolymer of divinylbenzene and at least one member of the group consisting of 2-vinylpyridine and 4-vinylpyridine, method of electrolysis of an electrolyte using the said diaphragms and an electrolysis cell containing said diaphragms.
Inventors
- 👤 Oronzio De Nora
- 👤 Luigi Giuffre
- 👤 Giovanni Modica
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:30
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2243; C25B13/00; C25B13/04; C08J2339/00; C08J2339/04; C08J2339/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
34 words
A porous, electrolyte permeable composite diaphragm comprising a chemically inert fibrous porous matrix or substrate impregnated with a copolymer of divinylbenzene and at least one member of the group consisting of 2-vinylpyridine and 4-vinylpyridine.
Claim 2
Dependent Claim
34 words
A porous, electrolyte permeable composite diaphragm comprising a chemically inert fibrous porous matrix or substrate impregnated with a copolymer of divinylbenzene and at least one member of the group consisting of 2-vinylpyridine and 4-vinylpyridine.
Claim 3
Dependent Claim
21 words
The composite diaphragm of claim 1 wherein the copolymer was directly polymerized on the substrate in the absence of a solvent.
Claim 4
Dependent Claim
21 words
The diaphragm of claim 2 wherein the ratio of vinylpyridine to divinylbenzene is between 9 to 1 and 3 to 2.
Claim 5
Dependent Claim
17 words
The diaphragm of claim 3 wherein the weight of the copolymer was 8 to 16% by weight.
Claim 6
Dependent Claim
13 words
The composite diaphragm of claim 1 wherein the inert fibrous material is asbestos.
Claim 7
Dependent Claim
22 words
The composite diaphragm of claim 1 wherein the amount of copolymer is from 5 to 25% by weight of the composite diaphragm.
Claim 8
Dependent Claim
19 words
The composite diaphragm of claim 1 wherein the molar ratio between vinylpyridine to divinylbenzene is between 16/1 and 1/1.
Claim 9
Dependent Claim
9 words
The diaphragm of claim 1 wherein 4-vinylpyridine is used.
Claim 10
Dependent Claim
29 words
An electrolytic cell comprising at least one anode and one cathode forming a interelectrodic gap with a porous, electrolyte permeable diaphragm of claim 1 separating the anode and cathode.
Claim 11
Dependent Claim
12 words
The cell of claim 9 wherein the inert fibrous material is asbestos.
Claim 12
Dependent Claim
21 words
The cell of claim 9 wherein the amount of copolymer is from 5 to 25% by weight of the composite diaphragm.
Claim 13
Dependent Claim
18 words
The cell of claim 9 wherein the molar ratio between vinylpyridine and divinylbenzene is between 16/1 and 1/1.
Claim 14
Dependent Claim
20 words
The cell of claim 9 wherein the copolymer was directly polymerized on the substrate in the absence of a solvent.
Claim 15
Dependent Claim
21 words
The cell of claim 9 wherein the ratio of vinylpyridine to divinylbenzene is between 9 to 1 and 3 to 2.
Claim 16
Dependent Claim
17 words
The cell of claim 9 wherein the weight of the copolymer was 8 to 16% by weight.
Claim 17
Dependent Claim
9 words
The cell of claim 9 wherein 4-vinylpyridine is used.
References Cited (Backward Citations)
US2732351A
Cited
US3247133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |