US4081350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragms for use in the electrolysis of alkali metal chlorides
Assignee: Olin Corp
•
Filing: 1976-10-29
•
Granted: 1978-03-28
•
Expires: 1996-10-29
Abstract
Abstract A diaphragm for use in the electrolysis of alkali metal chloride solutions in elecrolytic diaphragm cells is comprised of a mixture of sand and a thermoplastic polymeric binding agent. The diaphragms may include a support material and an additive such as a lubricant. The diaphragms of the present invention have increased stability, a long operational life and are non-polluting.
Inventors
- 👤 Igor V. Kadija
- 👤 Kenneth E. Woodard, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:44
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/05; C25B13/07; C25B13/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
29 words
A diaphragm for use in the electrolysis of alkali metal chloride brines which comprises a cohesive body formed of a mixture of sand and a polyarylene sulfide binding agent.
Claim 2
Dependent Claim
29 words
A diaphragm for use in the electrolysis of alkali metal chloride brines which comprises a cohesive body formed of a mixture of sand and a polyarylene sulfide binding agent.
Claim 3
Dependent Claim
38 words
The diaphragm of claim 1 in which said mixture comprises from about 10 to about 90 percent by volume of said sand and from about 90 to about 10 percent by volume of said polyarylene sulfide binding agent.
Claim 4
Dependent Claim
12 words
The diaphragm of claim 1 in which said mixture contains a lubricant.
Claim 5
Dependent Claim
35 words
The diaphragm of claim 1 in which said mixture contains an electrically conductive support material selected from the group consisting of fibers, meshes and fabrics, said electrically conductive support material being encapsulated in said mixture.
Claim 6
Dependent Claim
14 words
The diaphragm of claim 2 in which said polyarylene sulfide compound is polyphenylene sulfide.
Claim 7
Dependent Claim
12 words
The diaphragm of claim 5 in which said mixture includes a lubricant.
Claim 8
Dependent Claim
18 words
The diaphragm of claim 6 in which said sand has a particle size smaller than about 40 mesh.
Claim 9
Dependent Claim
19 words
The diaphragm of claim 7 in which said polyphenylene sulfide has a particle size smaller than about 100 mesh.
Claim 10
Dependent Claim
36 words
The diaphragm of claim 8 in which said mixture comprises from about 10 to about 90 percent by volume of said sand and from about 90 to about 10 percent by volume of said polyphenylene sulfide.
Claim 11
Dependent Claim
12 words
The diaphragm of claim 9 in which said lubricant is granular graphite.
References Cited (Backward Citations)
US1291253A
Cited
US1742411A
Cited
US3093583A
Cited
US3303933A
Cited
US3413239A
Cited
US3702267A
Cited
US3796314A
Cited
US3980613A
Cited
US3923630A
Cited
US4032427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |