US4966919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite foams
Assignee: University of California
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Filing: 1989-06-20
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Granted: 1990-10-30
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Expires: 2009-06-20
Abstract
Abstract Composite foams are provided comprising a first rigid, microcellular, open-celled organic polymer foam having a density of from about 0.015 g/cm3 to about 0.20 g/cm3 and a pore size of from about 1 micron to about 30 microns, said first foam containing a second polymer having a density of from about 0.015 g/cm3 to about 0.20 g/cm3 or a second polymer foam having a density of from about 0.015 g/cm3 to about 0.20 g/cm3 and a pore size of from about 0.01 microns to about 1.0 micron within the open cells of said first foam.
Inventors
- 👤 Joel M. Williams, Jr.
- 👤 Alice M. Nyitray
- 👤 Mark H. Wilkerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:50
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/0093; C04B38/0096; C04B41/00; C04B41/45; C04B41/4582; C08; C08J; C08J9/00; C08J9/35; C08J9/36; C08J9/40; C08J9/42; C08J2205/00; C08J2205/02; C08J2205/026; C08J2205/04; C08J2205/05; C08J2205/052; C08J2425/00; C08J2461/00; Y; Y10; Y10S; Y10S521/00; Y10S521/918
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
A method of making a composite foam comprising: a. forming a first rigid, microcellular, open-celled selected from the group consisting of a polystyrene foam and a carbon foam having a density from about 0.015 g/cm 3 to about 0.10 g/cm 3 and a pore size of from about 1 micron to about 30 microns; and b. filling the open cells of said first foam with a second material selected from the group consisting of a silicon aerogel foam, a resorcinol-formaldehyde foam a phlorogluecinol-formaldehyde foam, or a polystyrene foam having a density of from about 0.01 g/cm 3 to about 0.60 g/cm 3 .
Claim 2
Independent Claim
103 words
A method of making a composite foam comprising: a. forming a first rigid, microcellular, open-celled selected from the group consisting of a polystyrene foam and a carbon foam having a density from about 0.015 g/cm 3 to about 0.10 g/cm 3 and a pore size of from about 1 micron to about 30 microns; and b. filling the open cells of said first foam with a second material selected from the group consisting of a silicon aerogel foam, a resorcinol-formaldehyde foam a phlorogluecinol-formaldehyde foam, or a polystyrene foam having a density of from about 0.01 g/cm 3 to about 0.60 g/cm 3 .
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the second polymer material is a foam material having a pore size of from about 0.01 microns to about 1.0 microns.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the second material is a closed-cell foam.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the second material is an open-celled foam.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the second material coats the walls of the open cells of the first foam.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the second material substantially completely fills the open cells of the first form.
References Cited (Backward Citations)
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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) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |