US4012265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-density microcellular foam and method of making same
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-09-02
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Granted: 1977-03-15
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Expires: 1995-09-02
Abstract
Abstract Low-density microcellular foam having a cell size of not greater than 2 mu m and method of making by dissolving cellulose acetate in an acetone-based solvent, gelling the solution in a water bath maintained at 0 DEG -10 DEG C for a selected period of time to allow impurities to diffuse out, freezing the gel, and then freeze-drying wherein water and solvents sublime and the gel structure solidifies into low-density microcellular foam. The foam has a density of 0.065 to 0.6x103 kg/m3 and cell size of about 0.3 to 2 mu m. The small cell size foam is particularly applicable for encapsulation of laser targets.
Inventors
- 👤 James A. Rinde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J2201/00; C08J2201/04; C08J2201/048; C08J2201/054; C08J2301/00; C08J2301/08; C08J2301/10; C08J2301/12; Y; Y10; Y10S; Y10S376/00; Y10S376/916
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
29 words
A cellulose acetate foam having a density in the range of 0.065 to 0.6×10 3 kg/m 3 and a cell size in the range of 0.3 to 2 μm.
Claim 2
Dependent Claim
29 words
A cellulose acetate foam having a density in the range of 0.065 to 0.6×10 3 kg/m 3 and a cell size in the range of 0.3 to 2 μm.
Claim 3
Dependent Claim
23 words
The foam defined in claim 1, wherein the density is about 0.1×10 3 kg/m 3 and the cell size is about 2 μm.
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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |