US4170538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm having zirconium and magnesium compounds in a porous matrix
Assignee: PPG Industries Inc
•
Filing: 1978-10-20
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Granted: 1979-10-09
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Expires: 1998-10-20
Abstract
Abstract Disclosed is a diaphragm having a porous matrix, e.g., a polymeric or asbestos matrix with a layer of magnesium oxide and a hydrous oxide of zirconium therein.
Inventors
- 👤 Robert B. Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:38
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/05; C25B13/07
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
In a method of preparing a hydrophilic matrix comprising contacting a porous matrix with a zirconium compound and converting the zirconium compound to a hydrous oxide of zirconium, the improvement comprising depositing a magnesium compound and the zirconium compound in the porous matrix and converting both compounds to oxides.
Claim 2
Dependent Claim
49 words
In a method of preparing a hydrophilic matrix comprising contacting a porous matrix with a zirconium compound and converting the zirconium compound to a hydrous oxide of zirconium, the improvement comprising depositing a magnesium compound and the zirconium compound in the porous matrix and converting both compounds to oxides.
Claim 3
Dependent Claim
14 words
The method of claim 1 comprising codepositing the zirconium compound and the magnesium compound.
Claim 4
Dependent Claim
30 words
The method of claim 2 comprising contacting the porous body with an aqueous solution comprising 1 to 30 weight percent Mg, basis total weight of magnesium and zirconium as oxides.
Claim 5
Dependent Claim
58 words
The method of claim 2 wherein the Mg is present in the solution as magnesium chloride, the zirconium is present in the solution as zirconium oxychloride, comprising contacting the porous matrix with the aqueous solution of zirconium oxychloride and magnesium chloride, and thereafter contacting the porous matrix with ammonia whereby to hydrolyze the zirconium oxychloride and magnesium chloride.
Claim 6
Dependent Claim
13 words
The method of claim 2 wherein the porous matrix is a hydrophobic fluorocarbon.
Claim 7
Dependent Claim
23 words
The method of claim 5 comprising depositing a hydrophilic fluorocarbon within the hydrophobic hydrocarbon porous matrix and thereafter codepositing the zirconium and magnesium.
Claim 8
Dependent Claim
13 words
The method of claim 2 wherein the porous matrix is an asbestos mat.
Claim 9
Dependent Claim
28 words
A diaphragm for a chlor-alkali electrolytic cell comprising: a porous matrix; and a codeposited film of magnesium oxide and a hydrous oxide of zirconium in said porous matrix.
Claim 10
Dependent Claim
28 words
A diaphragm for a chlor-alkali electrolytic cell comprising: a porous matrix; and a codeposited film of magnesium oxide and a hydrous oxide of zirconium in said porous matrix.
Claim 11
Dependent Claim
23 words
The diaphragm of claim 8 comprising about 1 to 30 weight percent magnesium oxide, basis total magnesium oxide and hydrous oxide of zirconium.
Claim 12
Dependent Claim
14 words
The diaphragm of claim 8 wherein the porous matrix is a porous, hydrophobic fluorocarbon.
Claim 13
Dependent Claim
13 words
The diaphragm of claim 8 wherein the porous matrix is an asbestos mat.
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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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |