Patent US3619459A successfully refreshed from Google Patents.
US3619459A
Expired / Lapsed
US
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Process for potting plasticized acetylated cellulose hollow fiber membranes
Assignee: Dow Chemical Co
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Filing: 1968-06-11
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Granted: 1971-11-09
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Expires: 1988-06-11
Abstract
Abstract An improved method for potting plasticized, acetylated cellulose hollow fibers with a thermosettable resin is disclosed wherein an improved bond between the cured resin and the fiber results when the resin comprises a mixture of the following components: a polyglycidyl ether of a polyhydric phenol, a reactive diluent, a polycarboxylic acid anhydride, a bond promoter, a thixotropic agent and a flexibilizing agent.
Inventors
- 👤 Paul G Schrader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:16
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/02; B01D63/021; B01D63/022; B01D63/023
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
The improved process of claim 1 wherein said plasticized acetylated cellulose fibers contain sulfolane.
Claim 2
Dependent Claim
28 words
The improved process of claim 1 wherein said polyepoxide resin is a glycidyl polyether of a polynuclear polyhydric phenol or a glycidyl polyether of a mononuclear polyhydric phenol.
Claim 3
Dependent Claim
16 words
The improved process of claim 1 wherein said polycarboxylic anhydride is maleic anhydride or glutaric anhydride.
Claim 4
Dependent Claim
13 words
The improved process of claim 1 wherein said thixotropic agent is colloidal silica.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |