Patent US4966919A successfully refreshed from Google Patents.
US4966919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite foams
Assignee: University of California
•
Filing: 1989-06-20
•
Granted: 1990-10-30
•
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)
US4430451A
Cited
US4525386A
Cited
US4454248A
Cited
US4555313A
Cited
US4673695A
Cited
US4756898A
Cited
US4806290A
Cited
US4832881A
Cited
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 |