US4072793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced ion-exchange membrane
Assignee: Asahi Kasei Corp
•
Filing: 1976-07-15
•
Granted: 1978-02-07
•
Expires: 1996-07-15
Abstract
Abstract A leno-woven fabric of a specific construction is found to effectively reinforce an ion-exchange membrane at a scarce density of reinforcing yarns to improve electrochemical property of the reinforced ion-exchange membrane.
Inventors
- 👤 Itaru Watanabe
- 👤 Yasumichi Yamakoshi
- 👤 Hirotsugu Miyauchi
- 👤 Sakae Tsushima
- 👤 Mitsunobu Fukumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:41
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/164; Y10T442/167
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
In a reinforced ion-exchange membrane comprising a fabric embedded in said ion-exchange membrane, the improvement which comprises using as the fabric a leno-woven fabric with a weave structure in which the numbers of warp yarns are in the range from 16 to 28 per one centimeter of width and those of filling yarns in the range from 8 to 14 per one centimeter of length, the square root of the denier divided by specific gravity of said warp yarn being in the range from 6 to 11 and that of said filling yarn in the range from 8 to 16.
Claim 2
Dependent Claim
100 words
In a reinforced ion-exchange membrane comprising a fabric embedded in said ion-exchange membrane, the improvement which comprises using as the fabric a leno-woven fabric with a weave structure in which the numbers of warp yarns are in the range from 16 to 28 per one centimeter of width and those of filling yarns in the range from 8 to 14 per one centimeter of length, the square root of the denier divided by specific gravity of said warp yarn being in the range from 6 to 11 and that of said filling yarn in the range from 8 to 16.
Claim 3
Dependent Claim
17 words
An ion-exchange membrane as claimed in claim 1, wherein the leno-woven fabric is made of polypropylene fibers.
Claim 4
Dependent Claim
20 words
An ion-exchange membrane as claimed in claim 1, wherein the leno-woven fabric is made of fibers of a fluorocarbon polymer.
Claim 5
Dependent Claim
14 words
An ion-exchange membrane as claimed in claim 3, wherein the fluorocarbon polymer is polytetrafluoroethylene.
Claim 6
Dependent Claim
39 words
The ion-exchange membrane according to claim 4, wherein the ion-exchange membrane is of a fluorocarbon polymer film and warp yarns are polytetrafluoroethylene fibers of 70 to 260 denier and filling yarns are polytetrafluoroethylene fibers of 130 to 540 denier.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |