US4137361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder products
Assignee: Vistatech Corp
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Filing: 1977-03-30
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Granted: 1979-01-30
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Expires: 1997-03-30
Abstract
Abstract Novel powders, and resinous compositions bearing said powders, characterized by excellent chemical stability, electrical conductivity, and energy-absorbing characteristics. These three characteristics can be utilized, alone or combination, in forming many novel articles including microwave shielding apparatus, magnetic recording media, explosives, and the like articles. The more advantageous powders are characterized by a very thin coating of an electrically conductive metal carbide, metal silicide, or metal boride upon the surface thereof, and a metal core.
Inventors
- 👤 Robert J. Deffeyes
- 👤 Grover L. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:22
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B22; B22F; B22F1/00; B22F1/16; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/20; H01F1/22; H01F1/24; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/911; Y10S505/00; Y10S505/80; Y10S505/801; Y10S505/807; Y10S505/815; Y10S505/818; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/26; Y10T428/261; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
77 words
An article of manufacture comprising a substrate and, thereupon a coating of a conductive composition comprising (1) a mass of small particles formed of a core material of an electroconductive metal and a thin electrically-conductive, corrosion-resistant, surface layer of a conductive silicide, boride or carbide and (2) a resin matrix for said particles within which said particles are dispersed and form means to conduct electricity and said conductive composition having a resistivity of less than 2500 ohm-centimeters.
Claim 2
Dependent Claim
77 words
An article of manufacture comprising a substrate and, thereupon a coating of a conductive composition comprising (1) a mass of small particles formed of a core material of an electroconductive metal and a thin electrically-conductive, corrosion-resistant, surface layer of a conductive silicide, boride or carbide and (2) a resin matrix for said particles within which said particles are dispersed and form means to conduct electricity and said conductive composition having a resistivity of less than 2500 ohm-centimeters.
Claim 3
Dependent Claim
16 words
An article as defined in claim 1 wherein said metallic particles are coated with nickel carbide.
Claim 4
Dependent Claim
37 words
An article of manufacture as defined in claim 2 wherein said particles are below 10 microns in diameter, and have a resistivity of less than 25 ohm-centimeters and said thin layer is 3 to 10 atoms thick.
Claim 5
Dependent Claim
37 words
An article of manufacture as defined in claim 1 wherein said particles are below 10 microns in diameter, and have a resistivity of less than 25 ohm-centimeters and said thin layer is 3 to 10 atoms thick.
Claim 6
Dependent Claim
57 words
A shaped article adapted for shielding an environment from electromagnetic radiation, said article bearing a coating of a conductive composition comprising a resin matrix and a mass of small particles formed of a core material of an electroconductive metal and a thin electrically-conductive, corrosion-resistant, surface layer of a conductive silicide, boride or carbide on the surface thereof.
Claim 7
Dependent Claim
57 words
A shaped article adapted for shielding an environment from electromagnetic radiation, said article bearing a coating of a conductive composition comprising a resin matrix and a mass of small particles formed of a core material of an electroconductive metal and a thin electrically-conductive, corrosion-resistant, surface layer of a conductive silicide, boride or carbide on the surface thereof.
Claim 8
Dependent Claim
19 words
An article as defined in claim 5 wherein said metal particles are nickel and said coating is nickel carbide.
Claim 9
Dependent Claim
19 words
An article as defined in claim 5 wherein said metal particles are iron and said coating is iron carbide.
Claim 10
Dependent Claim
15 words
A shaped article as defined in claim 5 comprising a minimum thickness of 0.010 inch.
Claim 11
Dependent Claim
16 words
An article as defined in claim 5 wherein the particles are formed of a ferromagnetic metal.
Claim 12
Dependent Claim
16 words
An article as defined in claim 5 wherein the particles are formed of a superparamagnetic metal.
Claim 13
Dependent Claim
18 words
A shaped article as defined in claim 5 wherein said thin layer is 3 to 10 atoms thick.
Claim 14
Dependent Claim
22 words
An article as defined in claim 5 wherein said matrix and particles form a composition having a resistivity of below 2500 ohm-centimeters.
Claim 15
Dependent Claim
17 words
An article as defined in claim 12 wherein said surface layer is iron carbide or nickel carbide.
Claim 16
Dependent Claim
21 words
A magnetic recording medium carrying thereon a ferromagnetic layer comprising carbide or silicide-coated ferromagnetic metallic particles dispersed within a resin matrix.
Claim 17
Dependent Claim
21 words
A magnetic recording medium carrying thereon a ferromagnetic layer comprising carbide or silicide-coated ferromagnetic metallic particles dispersed within a resin matrix.
Claim 18
Dependent Claim
19 words
A magnetic recording medium as defined in claim 14 wherein said metal particles are iron powder or cobalt powder.
Claim 19
Dependent Claim
72 words
An article of manufacture, a magnetic recording member comprising a substrate and on said substrate a coating formed of a conductive composition comprising (1) a mass of small particles formed of a core material of an electroconductive metal and a thin electrically-conductive, corrosion-resistant, surface layer of a conductive silicide, boride or carbide and (2) a resin matrix for said particles within which said particles are dispersed and form means to conduct electricity.
Claim 20
Dependent Claim
72 words
An article of manufacture, a magnetic recording member comprising a substrate and on said substrate a coating formed of a conductive composition comprising (1) a mass of small particles formed of a core material of an electroconductive metal and a thin electrically-conductive, corrosion-resistant, surface layer of a conductive silicide, boride or carbide and (2) a resin matrix for said particles within which said particles are dispersed and form means to conduct electricity.
References Cited (Backward Citations)
US3743499A
Cited
US3901689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |