US3661267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid filters
Assignee: United States Atomic Energy Commission
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Filing: 1970-11-03
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Granted: 1972-05-09
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Expires: 1990-11-03
Abstract
Abstract A rigid open-cell plastic foam body useful, for example, as a filter is prepared by mixing equal parts of a diglycidal ether of bisphenol A epoxy resin and the reaction product of an excess of a polyfunctional amine and a polyfunctional fatty acid with two parts of water while avoiding the entrapment of air in the mixture to form an emulsion in which water is the continuous phase, casting the emulsion in the desired form and curing the emulsion.
Inventors
- 👤 Finley W Markley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:25
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/14; B01D69/141; B01D69/1411; B01D39/00; B01D39/14; B01D39/16; B01D39/1669; B01D39/1676; C; C08; C08J; C08J9/00; C08J9/28; C08L; C08L63/00; C08J2363/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
36 words
A method according to claim 1 wherein the epoxy resin is a diglycidal ether of bisphenol A and the surfactant is the reaction product of an excess of a polyfunctional amine and a polyfunctional fatty acid.
Claim 2
Dependent Claim
33 words
A method according to claim 2 wherein equal parts of the epoxy resin and the surfactant are mixed to form a solution and the solution is mixed with an equal amount of water.
Claim 3
Dependent Claim
18 words
A filter consisting of a cylindrical body formed of an open-cell foam prepared as taught in claim 1.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |