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US4500595A
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Stainless steel fiber-thermosplastic granules and molded articles therefrom
Assignee: AKZO PLASTICS BV A DUTCH CORP
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Filing: 1982-07-22
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Granted: 1985-02-19
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Expires: 2002-07-22
Abstract
Abstract A composite plastic material having improved shielding against electromagnetic interference is provided by injection molding a molding compound comprising elongated granules obtained by incorporating into a thermoplastic resin matrix stainless steel fibers in the form of continuous strands.
Inventors
- 👤 Steven R. Gerteisen
- 👤 Richard M. Wenger
- 👤 Glenn M. Cannavo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:33
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/06; H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; B; B29; B29C; B29C45/00; B29C2045/0091; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249942; Y10T428/249944; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31507; Y10T428/31678
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
A thermoplastic resin elongated granule providing improved electromagnetic interference shielding properties comprising a thermoplastic resin elongated granule having incorporated therein a fiber constituent comprised of continuous strands of stainless steel fibers, said fibers extending substantially parallel to each other and substantially parallel to a length of the elongated granule.
Claim 2
Dependent Claim
49 words
A thermoplastic resin elongated granule providing improved electromagnetic interference shielding properties comprising a thermoplastic resin elongated granule having incorporated therein a fiber constituent comprised of continuous strands of stainless steel fibers, said fibers extending substantially parallel to each other and substantially parallel to a length of the elongated granule.
Claim 3
Dependent Claim
34 words
An elongated granule according to claim 1 wherein the fiber component and the resin component are present by over a range of fiber to resin of from about 0.5% to about 60% by weight.
Claim 4
Dependent Claim
23 words
An elongated granule according to claim 1 wherein the range of fiber to resin is from about 1.0% to about 8.0% by weight.
Claim 5
Dependent Claim
61 words
An elongated granule according to claim 1 wherein the thermoplastic resin is a member selected from the group consisting of polyolefins, polystyrene, styrene-acrylonitrile polymers, acrylonitrile-polybutadiene-styrene, nylon, polyphenylene sulfides, polyacetals, polysulfones, polycarbonates, polyurethanes, cellulose esters, polyester, acrylic polymers, polyvinyl chlorides, polyvinylidene chlorides, copolymers of vinyl chloride and vinylidene chloride, polyphenylene oxides, polyphenylene oxide-polystyrene blends and blends of any of the foregoing resins.
Claim 6
Dependent Claim
15 words
An elongated granule according to claim 4 wherein the composition resin is a polycarbonate resin.
Claim 7
Dependent Claim
18 words
Molded products characterized by superior electromagnetic interference shielding properties derived from elongated granules as claimed in claim 1.
Claim 8
Dependent Claim
14 words
Molded products as claimed in claim 6 when formed by an injection molding process.
Claim 9
Dependent Claim
49 words
A molded article characterized by superior electromagnetic interference shielding properties comprising a polymeric matrix and continuous strands of stainless steel fibers, wherein said article is derived from the elongated granules of claim 1 having incorporated therein said fibers which extend substantially entirely over said length of said elongated granule.
Claim 10
Dependent Claim
18 words
An elongated granule of claim 1 wherein said steel fibers comprise from about 60 to about 20,000 filaments.
Claim 11
Dependent Claim
31 words
An elongated granule of claim 1 wherein said granule has a length of from about 1/16 to about 11/2 inches and a nominal cross-section of about 1/16 to about 1/4 inch.
Claim 12
Dependent Claim
18 words
An elongated granule of claim 10 wherein each of said fibers has a diameter of about 8 microns.
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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) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |