US5356958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact resistant thermoplastic syntactic foam composite and method
Assignee: EIDP Inc
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Filing: 1993-08-20
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Granted: 1994-10-18
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Expires: 2013-08-20
Abstract
Abstract Typical embodiments of the syntactic foam panel construction which characterize the intention have (1), at least one face sheet of thermoplastic resin reinforced with microballoons and (2) a foam core prepared from thermoplastic syntactic foam flakes consisting of a mixture of hollow glass microballoons, short reinforcing fibers and thermoplastic resin.
Inventors
- 👤 Abraham M. Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; C08J3/00; C08J3/20; C08J3/205; C08J3/21
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
117 words
A process for preparing dry syntactic foam flakes comprising the steps of: mixing thermoplastic resin with dichloroacetic acid in a 1:10 to 1:20 wt. ratio of resin to acid to form a mixture; heating said mixture up to about 100° C. while stirring a sufficient amount of time to form a homogeneous and stable viscous resin solution; adding to said solution a sufficient amount of glass microspheres and short fibers to form a composition of resin, glass microspheres and fibers respectively; stirring said composition; agitating said composition in a container with water to form coagulated flakes of resin, glass microballoons and fibers; draining said water and dichloroacetic acid from said container; and neutralizing then drying said flakes.
Claim 2
Dependent Claim
117 words
A process for preparing dry syntactic foam flakes comprising the steps of: mixing thermoplastic resin with dichloroacetic acid in a 1:10 to 1:20 wt. ratio of resin to acid to form a mixture; heating said mixture up to about 100° C. while stirring a sufficient amount of time to form a homogeneous and stable viscous resin solution; adding to said solution a sufficient amount of glass microspheres and short fibers to form a composition of resin, glass microspheres and fibers respectively; stirring said composition; agitating said composition in a container with water to form coagulated flakes of resin, glass microballoons and fibers; draining said water and dichloroacetic acid from said container; and neutralizing then drying said flakes.
Claim 3
Dependent Claim
17 words
The process of claim 1, including the stage of compression molding said flakes into a formed object.
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) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |