US4224068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making distributor rotor electrode containing dielectric bodies for suppressing radio frequency interference
Assignee: Motors Liquidation Co
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Filing: 1978-09-14
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Granted: 1980-09-23
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Expires: 1998-09-14
Abstract
Abstract This invention relates to an improved method of making a distributor rotor electrode wherein dielectric particles are dispersed in an electrically conductive metal matrix for suppressing radio frequency intereference. More particularly, the invention relates to a method of making such electrodes wherein a mixture comprised of silica and copper oxide is fused into a solid material which is then comminuted into powder particles 50 microns in size, or less, and having irregular shapes. The powder particles themselves are comprised of a microscopic interspersion of a silica based phase and a copper oxide based phase. These powder particles are thereafter combined with a powder of an electrically conductive metal to form a uniform second mixture comprising about 0.5 to 15 weight percent silica. The second mixture is then pressed in a compact for a rotor electrode body and sintered to form a wear resistant densified rotor electrode.
Inventors
- 👤 Douglas J. Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:27
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/02; F02P7/021; F02P7/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A method of making a spark erosion resistant distributor rotor electrode containing irregularly shaped dielectric particles dispersed in an electrically conductive metal matrix for suppressing radio frequency interference, said method comprising: fusing a first mixture comprising silica and copper oxide to form a microscopic interspersion of said constituents in a friable solid material; comminuting said material to a powder, the powder particles being characterized by their irregular shapes and an average particle size of 50 microns or less; combining an amount of said powder with a powder of an electrically conductive metal or metals to form a uniform second mixture comprising from about 0.5 to 15 weight percent silica; pressing said second mixture into a compact for a rotor electrode body; and sintering said compact in a reducing atmosphere to form a densified rotor electrode body.
Claim 2
Independent Claim
136 words
A method of making a spark erosion resistant distributor rotor electrode containing irregularly shaped dielectric particles dispersed in an electrically conductive metal matrix for suppressing radio frequency interference, said method comprising: fusing a first mixture comprising silica and copper oxide to form a microscopic interspersion of said constituents in a friable solid material; comminuting said material to a powder, the powder particles being characterized by their irregular shapes and an average particle size of 50 microns or less; combining an amount of said powder with a powder of an electrically conductive metal or metals to form a uniform second mixture comprising from about 0.5 to 15 weight percent silica; pressing said second mixture into a compact for a rotor electrode body; and sintering said compact in a reducing atmosphere to form a densified rotor electrode body.
Claim 3
Independent Claim
162 words
A method of making an electrically conductive metal distributor rotor electrode in which spark erosion resistant dielectric particles are dispersed for suppressing radio frequency interference, the method comprising: fusing a first mixture consisting essentially by weight of from about 5 to 30 percent copper oxide and the remainder silica to form a microscopic interspersion of said constituents in a friable solid material; comminuting said material to a powder, the powder particles being characterized by their irregular shapes and an average particle size of 50 microns or less; combining an amount of said powder with copper metal powder to form a uniform second mixture comprising from about 0.5 to 15 weight percent silica; pressing said second mixture into a compact for a rotor electrode body; and sintering said compact in a reducing atmosphere for said copper oxide to form a densified rotor electrode body wherein at least a portion of the copper oxide of the irregularly shaped particles is reduced to copper metal.
Claim 4
Independent Claim
162 words
A method of making an electrically conductive metal distributor rotor electrode in which spark erosion resistant dielectric particles are dispersed for suppressing radio frequency interference, the method comprising: fusing a first mixture consisting essentially by weight of from about 5 to 30 percent copper oxide and the remainder silica to form a microscopic interspersion of said constituents in a friable solid material; comminuting said material to a powder, the powder particles being characterized by their irregular shapes and an average particle size of 50 microns or less; combining an amount of said powder with copper metal powder to form a uniform second mixture comprising from about 0.5 to 15 weight percent silica; pressing said second mixture into a compact for a rotor electrode body; and sintering said compact in a reducing atmosphere for said copper oxide to form a densified rotor electrode body wherein at least a portion of the copper oxide of the irregularly shaped particles is reduced to copper metal.
References Cited (Backward Citations)
US3085876A
Cited
US3730706A
Cited
US3802892A
Cited
US4135066A
Cited
US4077378A
Cited
US4072771A
Cited
US4130671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |