US4624798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive magnetic microballoons and compositions incorporating same
Assignee: GRAHAM OWEN B
•
Filing: 1985-02-19
•
Granted: 1986-11-25
•
Expires: 2005-02-19
Abstract
Abstract Electrically conductive microparticles characterized by high conductivity and low density are comprised of electrically nonconductive magnetic microballoons having an electrically conductive coating of a metal. When dispersed in an electrically nonconductive matrix, an electrically conductive composite material is formed in which the microparticles form a network of contacting particles throughout the matrix.
Inventors
- 👤 Wayne L. Gindrup
- 👤 Rebecca R. Vinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:28
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0083; C; C03; C03C; C03C17/00; C03C17/06; C03C17/10; C03C17/22; C04; C04B; C04B20/00; C04B20/10; C04B20/1055; C04B20/1062; C04B41/00; C04B41/45; C04B41/4584; C08; C08K; C08K7/00; C08K7/22; C08K7/24; C08K7/26; C08K9/00; C08K9/02; C08K9/12; C09; C09C; C09C3/00; C09C3/06; C09C3/066; C09D; C09D5/00; C09D5/24; C09D5/32; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01Q; H01Q17/00; H01Q17/002; C01; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/34; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/10; C01P2006/40; C03C2217/00; C03C2217/20; C03C2217/28; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/095; H05K3/00; H05K3/30; H05K3/32; H05K3/321; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/2998
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
64 words
Electrically conductive microparticles characterized by high conductivity and low density, said microparticles comprising hollow microballoons of a ceramic silicate composition containing magnetic impurities imparting permanent magnet properties which render the microballoons magnetically attractive to one another to form a network of contacting particles, and a plating of an electrically conductive metal uniformly covering the surface of said microballoons and imparting electrically conductive properties thereto.
Claim 2
Dependent Claim
64 words
Electrically conductive microparticles characterized by high conductivity and low density, said microparticles comprising hollow microballoons of a ceramic silicate composition containing magnetic impurities imparting permanent magnet properties which render the microballoons magnetically attractive to one another to form a network of contacting particles, and a plating of an electrically conductive metal uniformly covering the surface of said microballoons and imparting electrically conductive properties thereto.
Claim 3
Dependent Claim
27 words
Electrically conductive microparticles according to claim 1 wherein said microballoons have a diameter of from 1 to 500 microns and a specific gravity of 0.2 to 2.
Claim 4
Dependent Claim
66 words
Electrically conductive microparticles characterized by high conductivity and low density, said microparticles comprising hollow ceramic magnetic centospheres derived from the ash from coal-fired furnaces and having permanent magnet properties which render the microballoons magnetically attractive to one another to form a network of contacting particles, and a plating of an electrically conductive metal uniformly covering the surface of said microballoons and imparting electrically conductive properties thereto.
Claim 5
Dependent Claim
66 words
Electrically conductive microparticles characterized by high conductivity and low density, said microparticles comprising hollow ceramic magnetic centospheres derived from the ash from coal-fired furnaces and having permanent magnet properties which render the microballoons magnetically attractive to one another to form a network of contacting particles, and a plating of an electrically conductive metal uniformly covering the surface of said microballoons and imparting electrically conductive properties thereto.
Claim 6
Dependent Claim
109 words
Electrically conductive microparticles characterized by high conductivity and low density, said microparticles comprising hollow microballoons formed of a ceramic silicate composition and having permanent magnet properties which render the microballoons magnetically attractive to one another to form a network of contacting particles, said microballoons having a diameter of between about 1 and 500 microns and a specific gravity of between about 0.2 and 2; and an electrically conductive coating of metal uniformly covering the surface of said microballoons and imparting electrical conductivity thereto, said metal being chosen from the group consisting of silver, copper, nickel, gold, platinum, palladium, osmium, iridium, and tin and alloys consisting essentially of these metals.
Claim 7
Dependent Claim
109 words
Electrically conductive microparticles characterized by high conductivity and low density, said microparticles comprising hollow microballoons formed of a ceramic silicate composition and having permanent magnet properties which render the microballoons magnetically attractive to one another to form a network of contacting particles, said microballoons having a diameter of between about 1 and 500 microns and a specific gravity of between about 0.2 and 2; and an electrically conductive coating of metal uniformly covering the surface of said microballoons and imparting electrical conductivity thereto, said metal being chosen from the group consisting of silver, copper, nickel, gold, platinum, palladium, osmium, iridium, and tin and alloys consisting essentially of these metals.
Claim 8
Dependent Claim
39 words
Electrically conductive microparticles according to claim 4 wherein said ceramic silicate composition additionally includes a magnetic material selected from the group consisting of iron, nickel, iron oxide, ferrite, or mixtures of these materials imparting magnetic properties to the microballoons.
Claim 9
Dependent Claim
86 words
Electrically conductive microparticles characterized by high conductivity and low density, said microparticles comprising hollow ceramic magnetic microballoons derived from the ash from coal-fired furnaces, said microballoons having permanent magnet properties which render the microballoons magnetically attractive to one another to form a network of contacting particles, and said microballoons having a diameter of from 1 to 500 microns and a specific gravity of between about 0.2 and 2, and a bright mirror-like silver plating uniformly covering the surface of said microballoons and imparting electrical conductivity thereto.
Claim 10
Dependent Claim
86 words
Electrically conductive microparticles characterized by high conductivity and low density, said microparticles comprising hollow ceramic magnetic microballoons derived from the ash from coal-fired furnaces, said microballoons having permanent magnet properties which render the microballoons magnetically attractive to one another to form a network of contacting particles, and said microballoons having a diameter of from 1 to 500 microns and a specific gravity of between about 0.2 and 2, and a bright mirror-like silver plating uniformly covering the surface of said microballoons and imparting electrical conductivity thereto.
Claim 11
Dependent Claim
31 words
The invention according to claim 6 wherein said electrically conductive microparticles are dispersed in an electrically non-conductive matrix and are magnetically attracted to one another to form an electrically conductive network.
Claim 12
Dependent Claim
33 words
The invention according to claim 1 or 6 wherein said electrically conductive microparticles are adhered to an electrically non-conductive base and are magnetically attracted to one another to form an electrically conductive network.
Claim 13
Dependent Claim
34 words
The invention according to claim 1 or 6 wherein said electrically conductive microparticles are dispersed in an electrically non-conductive polymeric adhesive and are magnetically attracted to one another to form an electrically conductive network.
Claim 14
Dependent Claim
33 words
The invention according to claim 1 or 6 wherein said electrically conductive microparticles are dispersed in an electrically non-conductive liquid and are magnetically attracted to one another to form an electrically conductive network.
Claim 15
Dependent Claim
31 words
The invention according to claim 1 wherein said electrically conductive microparticles are dispersed in an electrically non-conductive matrix and are magnetically attracted to one another to form an electrically conductive network.
References Cited (Backward Citations)
DD94106A
Cited
US2871139A
Cited
US3476530A
Cited
US3877960A
Cited
US3635824A
Cited
US3846345A
Cited
CH542909A
Cited
US3988651A
Cited
US4199614A
Cited
US4218430A
Cited
US4415512A
Cited
EP0036940A1
Cited
US4419279A
Cited
US4496475A
Cited
US4316786A
Cited
US4434541A
Cited
US4496627A
Cited
DE3210770A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |