US5164060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange membrane having increased efficiency in proton exchange processes
Assignee: Dow Chemical Co
•
Filing: 1991-05-17
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Granted: 1992-11-17
•
Expires: 2011-05-17
Abstract
Abstract An ion exchange membrane or ion exchange membrane/electrode assembly having increased efficiency in proton exchange processes as the result of membrane hydration processing comprising heating a hermetically sealed membrane or membrane/electrode assembly at elevated temperature and pressure so as to provide increased hydration levels of the membrane.
Inventors
- 👤 Glenn A. Eisman
- 👤 Robert D. Door
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:09
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/10; H01M8/1004; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J5/2293; H01M8/02; H01M8/0289; H01M8/1016; H01M8/1018; H01M8/102; H01M8/1023; H01M8/1039; H01M8/1067; H01M8/1069; H01M8/1086; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
62 words
A process for making an ion exchange membrane having enhanced performance characteristics upon utilization in a proton exchange electrochemical cell comprising: (a) exposing to water said ion exchange membrane in the proton form, thereafter (b) heating said membrane at a temperature above the glass transition temperature of the polymer forming said ion exchange membrane and, thereafter (c) exposing said membrane to water.
Claim 2
Dependent Claim
62 words
A process for making an ion exchange membrane having enhanced performance characteristics upon utilization in a proton exchange electrochemical cell comprising: (a) exposing to water said ion exchange membrane in the proton form, thereafter (b) heating said membrane at a temperature above the glass transition temperature of the polymer forming said ion exchange membrane and, thereafter (c) exposing said membrane to water.
Claim 3
Dependent Claim
64 words
An ion exchange membrane made by the method of claim 1 wherein said proton exchange cell is a fuel cell or a water electrolysis cell and wherein the ion exchange membrane is a polymer derived from a monomer represented by the formula: ##STR6## where X═Cl, Br or F and n=0-3 and wherein the polymer has an equivalent weight of about 800 to about 1500.
Claim 4
Dependent Claim
22 words
The ion exchange membrane of claim 2, wherein the ion exchange membrane has an equivalent weight of about 800 to about 1300.
Claim 5
Dependent Claim
30 words
The ion exchange membrane of claim 2, wherein the ion exchange membrane has an equivalent weight of less than 1000 and the ion exchange membrane is hermetically sealed during heating.
Claim 6
Dependent Claim
19 words
The ion exchange membrane of claim 2, the ion exchange membrane has an equivalent weight of less than 1000.
Claim 7
Dependent Claim
19 words
The ion exchange membrane of claim 2 wherein n is equal to 1 and X is equal to fluorene.
Claim 8
Dependent Claim
21 words
The ion exchange membrane of claim 2 wherein n is equal to 1 and X is equal to chlorine or bromine.
Claim 9
Dependent Claim
13 words
The ion exchange membrane of claim 2 wherein n is equal to 0.
Claim 10
Dependent Claim
58 words
The process of claim 1 wherein said proton exchange cell is a fuel cell or a water electrolysis cell and wherein the ion exchange membrane is a polymer derived from a monomer represented by the formula: ##STR7## where X═Cl, Br or F and n=0-3 and wherein the polymer has an equivalent weight of about 800 to about 1500.
Claim 11
Dependent Claim
20 words
The process of claim 9 wherein n in said polymer is equal to 1 and X is equal to fluorine.
Claim 12
Dependent Claim
19 words
The process of claim 9 wherein n is equal to 1 and X is equal to chlorine or bromine.
Claim 13
Dependent Claim
11 words
The process of claim 9 wherein n is equal to 0.
Claim 14
Dependent Claim
54 words
An ion exchange membrane/electrode assembly wherein said membrane is made by the method of claim 1 wherein the ion exchange membrane is a polymer derived from a monomer represented by the formula ##STR8## where X═Cl, Br or F and n=0-3 and wherein the polymer has an equivalent weight of about 800 to about 1500.
Claim 15
Dependent Claim
20 words
The ion exchange membrane/electrode assembly of claim 13 wherein n is equal to 1 and X is equal to fluorine.
Claim 16
Dependent Claim
22 words
The ion exchange membrane/electrode assembly of claim 13 wherein n is equal to 1 and X is equal to chlorine or bromine.
Claim 17
Dependent Claim
14 words
The ion exchange membrane/electrode assembly of claim 13 wherein n is equal to 0.
Claim 18
Dependent Claim
23 words
The ion exchange membrane/electrode assembly of claim 13 wherein the ion exchange membrane has an equivalent weight of about 800 to about 1300.
Claim 19
Dependent Claim
31 words
The ion exchange membrane/electrode assembly of claim 13 wherein the ion exchange membrane has an equivalent weight of less than 1000 and the ion exchange membrane is heremetically sealed during heating.
Claim 20
Dependent Claim
24 words
The ion exchange membrane/electrode assembly of claim 13 wherein a=0-2, b=0-2, and the ion exchange membrane has an equivalent weight of less than 1000.
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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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |