Patent US4492732A successfully refreshed from Google Patents.
US4492732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Materials suitable for thermosetting
Assignee: UK Secretary of State for Defence
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Filing: 1983-05-18
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Granted: 1985-01-08
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Expires: 2003-05-18
Abstract
Abstract A material suitable for thermosetting includes a collection of hollow particles adhesively mixed with a thermosetting resin in such proportions that the mixture exists in a granular form and may be converted by thermosetting into a fused solid mass having a density not greater than 0.5 grams per cubic centimeter. The particles may be glass microbubbles or phenolic microballoons and the resin may be a hardenable Friedel-Crafts resin. The material according to the invention is more suitable for packing into shaped cavities than known resins including those containing filler particles.
Inventors
- 👤 Davis J. Murphy
- 👤 Leslie N. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:02
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/22; C08K7/24; C08K7/28; B; B29; B29C; B29C70/00; B29C70/58; B29C70/60; B29C70/603; B29C70/66; C08J; C08J9/00; C08J9/32; B29K; B29K2101/00; B29K2101/10; B29K2105/00; B29K2105/06; B29K2105/16; B29K2105/165; B29K2709/00; B29K2709/08; B29L; B29L2031/00; B29L2031/08; B29L2031/082; B29L2031/30; B29L2031/3067; B29L2031/3076; B29L2031/3085; B29L2031/34; B29L2031/3456; Y; Y10; Y10S; Y10S264/00; Y10S264/06; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/2998
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A material suitable for thermosetting including a collection of hollow particles having average diameters in the inclusive range of 20 μm to 150 μm, each particle coated with a curable thermosetting resin, said resin being presented in the material in an amount not less than 45% by weight such that the mixture exists in a granular form of discrete individual grains, each grain having an and average diameter of about 2 mm. or less and including one or more of said resin-coated hollow particles such that each grain remains separate from other grains, said mixture being convertible by thermosetting to a fused solid mass having a density not greater than 0.5 grams per cubic centimeter.
Claim 2
Dependent Claim
115 words
A material suitable for thermosetting including a collection of hollow particles having average diameters in the inclusive range of 20 μm to 150 μm, each particle coated with a curable thermosetting resin, said resin being presented in the material in an amount not less than 45% by weight such that the mixture exists in a granular form of discrete individual grains, each grain having an and average diameter of about 2 mm. or less and including one or more of said resin-coated hollow particles such that each grain remains separate from other grains, said mixture being convertible by thermosetting to a fused solid mass having a density not greater than 0.5 grams per cubic centimeter.
Claim 3
Dependent Claim
14 words
A material as claimed in claim 1 wherein the hollow particles are glass microbubbles.
Claim 4
Dependent Claim
15 words
A material as claimed in claim 1 wherein the hollow particles are fly ash armospheres.
Claim 5
Dependent Claim
14 words
A material as claimed in claim 1 wherein the hollow particles are phenolic microballoons.
Claim 6
Dependent Claim
56 words
A material as claimed in claim 3 and wherein the resin is a hardenable Friedel-Crafts resin and the percentage by weight of resin contained in the material is such as to give, in a fused solid mass obtained by thermosetting the material, a percentage weight by resin of between the inclusive limits of 50 and 80%.
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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) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |