US3598241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Support system for membranes used in the reverse osmosis process
Assignee: Westinghouse Electric Corp
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Filing: 1968-08-22
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Granted: 1971-08-10
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Expires: 1988-08-22
Abstract
Abstract An open pore tube for use with reverse osmosis water purification membranes is made of bonded resin coated filler particles.
Inventors
- 👤 Charles H Vondracek
- 👤 Andrew S Calderwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:00
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/108
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
The tube of claim 1 wherein the resin coating is selected from the group consisting of phenolics, polyglycidyl ethers, polyesters, silicones, polystyrenes, polyimides and polyamide-imides.
Claim 2
Dependent Claim
23 words
The tube of claim 2 wherein the reverse osmosis membrane is selected from the group consisting of modified cellulose acetate and graphitic oxide.
Claim 3
Dependent Claim
39 words
The tube of claim 3 wherein the tube is externally supported and the filler particles are selected from the group consisting of sand, zircon, quartz, beryl, glass, hollow spherical glass beads, expanded perlite, ground pumice stone, and calcium silicate.
Claim 4
Dependent Claim
39 words
The tube of claim 4 containing axial holes therein, the membrane supported inside said axial holes, wherein the resin coating is a phenolic resin and the filler is sand having an average particle size between 50 and 100 microns.
Claim 5
Dependent Claim
55 words
A hollow vessel having a wall containing bonded resin coated granular filler particles having voids therebetween, wherein the resin constitutes about 2 to 18 weight percent of the resin coated filler particular weight and the filler has an average particle size between 40 and 500 microns, and a reverse osmosis membrane supported by said wall.
Claim 6
Dependent Claim
66 words
In combination, a rigid porous member and a semipermeable reverse osmosis membrane supported by said porous member, the porous member comprising inorganic particles having an average particle size between 40 and 500 microns and having a resinous film deposited thereon, said resinous film constituting about 4 to 32 volume percent of the porous member and bonding together adjacent inorganic particles to form said rigid porous member.
Claim 7
Dependent Claim
22 words
The combination of claim 7 wherein the inorganic particles are sand particles and the resinous film is a film of phenolic resin.
References Cited (Backward Citations)
US3400825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |