US4170537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a diaphragm having a gel of a hydrous oxide of zirconium in a porous matrix
Assignee: PPG Industries Inc
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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 method of preparing a hydrous zirconium oxide diaphragm by treating a porous matrix with ZrOCl 2 and hydrolyzing the ZrOCl 2 to ZrO 2 with NH 3 . The disclosed method contemplates leaching out the NH 4 Cl, dehydrating the substrate, and sequentially building up the ZrO 2 .
Inventors
- 👤 Robert B. Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:08
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/05; C25B13/07
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
In a method of preparing a diaphragm by contacting a porous matrix with zirconium oxychloride and thereafter with an ammonium compound whereby to hydrolyze the zirconium oxychloride to form a substantially insoluble hydrous oxide of zirconium, the improvement comprising leaching out the ammonium chloride and thereafter contacting the porous matrix with additional zirconium oxychloride whereby to deposit additional hydrous oxide of zirconium in the matrix.
Claim 2
Dependent Claim
65 words
In a method of preparing a diaphragm by contacting a porous matrix with zirconium oxychloride and thereafter with an ammonium compound whereby to hydrolyze the zirconium oxychloride to form a substantially insoluble hydrous oxide of zirconium, the improvement comprising leaching out the ammonium chloride and thereafter contacting the porous matrix with additional zirconium oxychloride whereby to deposit additional hydrous oxide of zirconium in the matrix.
Claim 3
Dependent Claim
18 words
The method of claim 1 comprising leaching out the ammonium chloride with water and thereafter dehydrating the matrix.
Claim 4
Dependent Claim
14 words
The method of claim 2 comprising dehydrating the matrix to a substantially constant weight.
Claim 5
Dependent Claim
30 words
The method of claim 1 comprising sequentially depositing at least about 0.1 gram per cubic centimeter of a hydrous oxide of zirconium calculated as zirconium oxide in said porous matrix.
Claim 6
Dependent Claim
16 words
The method of claim 1 comprising codepositing magnesium oxide and zirconium oxide in the porous matrix.
Claim 7
Dependent Claim
11 words
The method of claim 1 wherein the porous matrix is asbestos.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein the porous matrix is a fluorocarbon.
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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 |