US4332853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive plastic with metalized glass fibers retained in partial clumps
Assignee: International Business Machines Corp
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Filing: 1980-09-26
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Granted: 1982-06-01
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Expires: 2000-09-26
Abstract
Abstract Articles of a thermoplastic having an improved level of electromagnetic shielding are molded from plastic pellets that have a core of metalized glass fibers that are arranged to partially disperse through the molded article as individual fibers and partially to remain in clumps of generally aligned closely contacting fibers. The clumps have approximately the length of an individual fiber but they are substantially wider than an individual fiber. Improved conductivity is attributed to increased electrical bridging between fibers that is provided by the width of the clumps of fibers.
Inventors
- 👤 Frederick C. Hornbeck
- 👤 James E. Henning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:38
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; B; B29; B29B; B29B9/00; B29B9/12; B29B9/14; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; B29C70/14; B29C70/88; B29C70/882; C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08J5/08; G; G12; G12B; G12B17/00; G12B17/02; B29K; B29K2995/00; B29K2995/0003; B29K2995/0005; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2925; Y10T428/2929; Y10T428/2933; Y10T428/2936; Y10T428/294; Y10T428/2942; Y10T428/2944; Y10T428/2956; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
A thermo plastic molding pellet for molding articles of plastic and metalized glass fibers by a process in which the fibers disperse through a molded article but tend to become aligned in the general direction of the flow of plastic into a mold and contact between adjacent fibers for electrical conductivity is thereby reduced, comprising, a core of metalized glass fibers and an outer body of a thermoplastic, wherein the metalized glass fibers in the core of a pellet are arranged with an inner sub-bundle of fibers and an outer grouping of sub-bundles formed about said inner sub-bundle to partially disperse in the molded article as individual fibers and partially to remain as clumps having a thickness that is appreciably greater than the thickness of an individual fiber for improving the fiber to fiber contact in the direction orthogonal to the general direction of plastic flow in a subsequently molded plastic article.
Claim 2
Dependent Claim
152 words
A thermo plastic molding pellet for molding articles of plastic and metalized glass fibers by a process in which the fibers disperse through a molded article but tend to become aligned in the general direction of the flow of plastic into a mold and contact between adjacent fibers for electrical conductivity is thereby reduced, comprising, a core of metalized glass fibers and an outer body of a thermoplastic, wherein the metalized glass fibers in the core of a pellet are arranged with an inner sub-bundle of fibers and an outer grouping of sub-bundles formed about said inner sub-bundle to partially disperse in the molded article as individual fibers and partially to remain as clumps having a thickness that is appreciably greater than the thickness of an individual fiber for improving the fiber to fiber contact in the direction orthogonal to the general direction of plastic flow in a subsequently molded plastic article.
Claim 3
Dependent Claim
25 words
The plastic molding pellet of claim 1 wherein said metalized glass fibers are arranged in a twist of sub-bundles of fibers around an inner sub-bundle.
Claim 4
Dependent Claim
47 words
The plastic molding pellet of claim 2 wherein said metalized glass fibers are arranged in a twist of a first layer of sub-bundles in one direction about a central sub-bundle and a twist of a second layer of sub-bundles in the opposite direction about said first layer.
Claim 5
Dependent Claim
140 words
A thermo plastic molding pellet for molding articles of plastic and metalized glass fibers by a process in which the fibers disperse through a molded article but tend to become aligned in the general direction of the flow of plastic into a mold and contact between adjacent fibers for electrical conductivity is thereby reduced, comprising, a core of metalized glass fibers and an outer body of a thermoplastic, wherein the metalized glass fibers in the core of a pellet are arranged in a twist of fibers to partially disperse in the molded article as individual fibers and partially to remain as clumps having a thickness that is appreciably greater than the thickness of an individual fiber for improving the fiber to fiber contact in the direction orthogonal to the general direction of plastic flow in a subsequently molded plastic article.
Claim 6
Dependent Claim
140 words
A thermo plastic molding pellet for molding articles of plastic and metalized glass fibers by a process in which the fibers disperse through a molded article but tend to become aligned in the general direction of the flow of plastic into a mold and contact between adjacent fibers for electrical conductivity is thereby reduced, comprising, a core of metalized glass fibers and an outer body of a thermoplastic, wherein the metalized glass fibers in the core of a pellet are arranged in a twist of fibers to partially disperse in the molded article as individual fibers and partially to remain as clumps having a thickness that is appreciably greater than the thickness of an individual fiber for improving the fiber to fiber contact in the direction orthogonal to the general direction of plastic flow in a subsequently molded plastic article.
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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |