Patent US5320162A successfully refreshed from Google Patents.
Patent US4876009A successfully refreshed from Google Patents.
US4876009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrakis-amido high flux membranes
Assignee: Bend Research Inc
•
Filing: 1988-10-21
•
Granted: 1989-10-24
•
Expires: 2008-10-21
Abstract
Abstract Composite RO membranes of a microporous polymeric support and a polyamide reaction product of a tetrakis-aminomethyl compound and a polyacylhalide are disclosed, said membranes exhibiting high flux and good chlorine resistance.
Inventors
- 👤 Scott B. McCray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:04
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/1251; B01D71/00; B01D71/06; B01D71/56
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
A composite reverse osmosis membrane comprising a microporous polymeric support and the polyamide reaction product of a tetrakis-aminomethyl compound of the formula C--NHMe) 4 with an aromatic polyacylhalide of the formula Ar--COX) n where Me is methyl, Ar is aryl, X is halide and n is 2 or 3.
Claim 2
Dependent Claim
49 words
A composite reverse osmosis membrane comprising a microporous polymeric support and the polyamide reaction product of a tetrakis-aminomethyl compound of the formula C--NHMe) 4 with an aromatic polyacylhalide of the formula Ar--COX) n where Me is methyl, Ar is aryl, X is halide and n is 2 or 3.
Claim 3
Dependent Claim
15 words
The membrane of claim 1 wherein the reaction product is an interfacial polymerization reaction product.
Claim 4
Dependent Claim
15 words
The membrane of claim 1 or 2 wherein Ar is phenyl and X is chloride.
Claim 5
Dependent Claim
9 words
The membrane of claim 3 wherein n is 3.
Claim 6
Dependent Claim
13 words
The membrane of claim 1 or 2 wherein the microporous support is polysulfone.
Claim 7
Dependent Claim
9 words
The membrane of claim 3 wherein n is 2.
Claim 8
Dependent Claim
17 words
The membrane of claim 5 wherein n is 2 and the microporous support is a flat sheet.
Claim 9
Dependent Claim
17 words
The membrane of claim 5 wherein n is 2 and the microporous support is a hollow fiber.
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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |