Patent US4092459A successfully refreshed from Google Patents.
US4092459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder products
Assignee: Vistatech Corp
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Filing: 1975-01-13
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Granted: 1978-05-30
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Expires: 1995-01-13
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. 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 Lee Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:14
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: 27
Claim 1
Independent Claim
44 words
A mass of small particles formed of an electroconductive metal core material and comprising, adherent to said core material, a thin coating of an electrically conductive, corrosion resistant, surface layer of electrically conductive carbides, said mass having an electrical resistivity below 2500 ohm cm.
Claim 2
Dependent Claim
44 words
A mass of small particles formed of an electroconductive metal core material and comprising, adherent to said core material, a thin coating of an electrically conductive, corrosion resistant, surface layer of electrically conductive carbides, said mass having an electrical resistivity below 2500 ohm cm.
Claim 3
Dependent Claim
34 words
A mass of particles as defined in claim 1 wherein said core material is substantially metallic and is selected from the group of metals consisting of cobalt, nickel, iron or alloys of said metals.
Claim 4
Dependent Claim
24 words
A mass of particles as defined in claim 2 wherein said carbide coating forms less than about 25% of the mass of said particles.
Claim 5
Dependent Claim
21 words
A mass of particles as defined in claim 3 wherein said average diameter of said particles is 5 microns or below.
Claim 6
Dependent Claim
15 words
A mass of small particles as defined in claim 3 wherein said mass is superparamagnetic.
Claim 7
Dependent Claim
15 words
A mass of small particles as defined in claim 4 wherein said mass is superparamagnetic.
Claim 8
Dependent Claim
21 words
A mass of small particles as defined in claim 2, wherein said particles are less than ten microns in average diameter.
Claim 9
Dependent Claim
19 words
A mass of small particles as defined in claim 2, wherein said particles comprise less than 10% of carbide.
Claim 10
Dependent Claim
19 words
A mass of small particles as defined in claim 2 wherein the electrical resistivity is less than 25 ohm-cm.
Claim 11
Dependent Claim
24 words
A mass of particles as defined in claim 1 wherein said carbide coating forms less than about 25% of the mass of said particles.
Claim 12
Dependent Claim
21 words
A mass of particles as defined in claim 10 wherein said average diameter of said particles is 100 microns or below.
Claim 13
Dependent Claim
15 words
A mass of small particles as defined in claim 1 wherein said mass is superparamagnetic.
Claim 14
Dependent Claim
27 words
A mass of particles as described in claim 12 wherein said particles have a thickness of carbide of less than about 10 atomic layers of said coating.
Claim 15
Dependent Claim
19 words
A mass of small particles as defined in claim 12 wherein the electrical resistivity is less than 25 ohm-cm.
Claim 16
Dependent Claim
27 words
A mass of particles as described in claim 1 wherein said particles have a thickness of carbide of less than about 10 atomic layers of said coating.
Claim 17
Dependent Claim
21 words
A mass of small particles as defined in claim 1, wherein said particles are less than ten microns in average diameter.
Claim 18
Dependent Claim
19 words
A mass of small particles as defined in claim 16 wherein the electrical resistivity is less than 25 ohm-cm.
Claim 19
Dependent Claim
19 words
A mass of small particles as defined in claim 1, wherein said particles comprise less than 10% of carbide.
Claim 20
Dependent Claim
19 words
A mass of small particles as defined in claim 18 wherein the electrical resistivity is less than 25 ohm-cm.
Claim 21
Dependent Claim
23 words
A mass of small particles as defined in claim 1, wherein said core material is nickel and said inorganic layer is nickel carbide.
Claim 22
Dependent Claim
21 words
A mass of small particles as defined in claim 20, wherein said particles are less than ten microns in average diameter.
Claim 23
Dependent Claim
19 words
A mass of small particles as defined in claim 21, wherein said particles comprise less than 10% of carbide.
Claim 24
Dependent Claim
19 words
A mass of small particles as defined in claim 22 wherein the electrical resistivity is less than 25 ohm-cm.
Claim 25
Dependent Claim
15 words
A mass of small particles as defined in claim 21, wherein said metal is superparamagnetic.
Claim 26
Dependent Claim
19 words
A mass of small particles as defined in claim 21 wherein the electrical resistivity is less than 25 ohm-cm.
Claim 27
Dependent Claim
19 words
A mass of small particles as defined in claim 1 wherein the electrical resistivity is less than 25 ohm-cm.
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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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |