Patent US5352718A successfully refreshed from Google Patents.
US5352718A
Expired / Lapsed
US
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Electrorheological semisolid
Assignee: Bridgestone Corp
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Filing: 1991-10-21
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Granted: 1994-10-04
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Expires: 2011-10-21
Abstract
Abstract The present invention relates to an electrorheological semisolid capable of changing the rheological characteristics by an application of voltage. The semisolid is composed of 20-70 weight. Parts of carbonaceous particulates having an average particle size of 0.1-500 μm and a carbon/hydrogen atomic ratio (C/H ratio) of 1.2-5 which are dispersed in 80-30 weight % of a dispersion medium comprising a partially crosslinked electric insulating polymer having a penetration of 40-475 at 25° C., or into 80-30 weight % of a dispersion medium selected from an electric insulating oil having a viscosity of 5000 to 10 9 centistokes at 25° C. and an electric insulating polymer having a viscosity of 5000 to 10 9 centistokes at 25° C.
Inventors
- 👤 Yuichi Ishino
- 👤 Takayuki Maruyama
- 👤 Tasuku Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:19
CPC Classifications
C; C10; C10M; C10M171/00; C10M171/001; C08; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
51 words
An electrorheological semisolid comprising: 20-70 weight parts of carbonaceous particulates having an average particle size of 0.1-500 μm and a carbon/hydrogen atomic ration (C/H ratio) of 1.2-5 dispersed in 80-30 weight parts of a dispersion medium comprising a partially crosslinked electric insulating polymer having a penetration of 40-475 at 25° C.
Claim 2
Dependent Claim
51 words
An electrorheological semisolid comprising: 20-70 weight parts of carbonaceous particulates having an average particle size of 0.1-500 μm and a carbon/hydrogen atomic ration (C/H ratio) of 1.2-5 dispersed in 80-30 weight parts of a dispersion medium comprising a partially crosslinked electric insulating polymer having a penetration of 40-475 at 25° C.
Claim 3
Dependent Claim
19 words
An electrorheological semisolid according to claim 1, wherein the carbonaceous particulates have an average particle size of 1-100 μm.
Claim 4
Dependent Claim
17 words
An electrorheological semisolid according to claim 1, wherein the carbonaceous particulates contains 80-97 weight % of carbon.
Claim 5
Dependent Claim
21 words
An electrorheological semisolid according to claim 1, wherein the carbonaceous particulates have a volume resistivity of 10 5 -10 11 Ω·cm.
Claim 6
Dependent Claim
82 words
An electrorheological semisolid according to claim 1, wherein the carbonaceous particulates are selected from the group consisting of particulates of finely pulverized coal-tar pitch, petroleum pitch or pitch obtained by thermal decomposition of polyvinylchloride; carbonaceous mesophase spherules obtained by heat-treatment of these pitch or tar component to form optically anisotropic spherules and separating residual pitch component with solvents; pulverized products of these spherules; pulverized bulk mesophase obtained by heat-treatment of raw material pitches; pulverized partially crystallized pitch; and low-temperature carbonized thermosetting resins.
Claim 7
Dependent Claim
18 words
An electrorheological semisolid according to claim 5, wherein the low-temperature carbonized thermosetting resins are carbonized phenolic resin microbeads.
Claim 8
Dependent Claim
31 words
An electrorheological semisolid according to claim 1, wherein the partially crosslinked electric insulating polymer has penetration of 40-475 and a volume resistivity of 10 12 -10 17 Ω·cm at 25° C.
Claim 9
Dependent Claim
31 words
An electrorheological semisolid according to claim 7, wherein the partially crosslinked electric insulating polymer has penetration of 50-200 and a volume resistivity of 10 12 -10 17 Ω·cm at 25° C.
Claim 10
Dependent Claim
31 words
An electrorheological semisolid according to claim 8, wherein the partially crosslinked electric insulating polymer has penetration of 60-120 and a volume resistivity of 10 14 -10 16 Ω·cm at 25° C.
Claim 11
Dependent Claim
23 words
An electrorheological semisolid according to claim 7, wherein the partially crosslinked electric insulating polymer is a two-liquid type or one-liquid type silicone gel.
Claim 12
Dependent Claim
72 words
An electrorheological semisolid comprising: 20-70 weight parts of carbonaceous particulates having an average particle size of 0.1-14 500 μm and a carbon/hydrogen atomic ration (C/H ratio) of 1.2-5 dispersed in 80-30 weight parts of a dispersion medium selected from an electric insulating oil having a viscosity of 5000 to 10 9 centistokes at 25° C. and an electric insulating polymer having a viscosity of 5,000 to 10 9 centistokes at 25° C.
Claim 13
Dependent Claim
72 words
An electrorheological semisolid comprising: 20-70 weight parts of carbonaceous particulates having an average particle size of 0.1-14 500 μm and a carbon/hydrogen atomic ration (C/H ratio) of 1.2-5 dispersed in 80-30 weight parts of a dispersion medium selected from an electric insulating oil having a viscosity of 5000 to 10 9 centistokes at 25° C. and an electric insulating polymer having a viscosity of 5,000 to 10 9 centistokes at 25° C.
Claim 14
Dependent Claim
28 words
An electrorheological semisolid according to 11, wherein the electric insulating oil or electric insulating polymer has a volume resistivity of 10 10 -10 17 Ω·cm at 25° C.
Claim 15
Dependent Claim
28 words
An electrorheological semisolid according to 11, wherein the electric insulating oil or electric insulating polymer has a volume resistivity of 10 10 -10 17 Ω·cm at 25° C.
Claim 16
Dependent Claim
39 words
An electrotheological semisolid according to claim 12, wherein the electric insulating oil or electric insulating polymer has a viscosity of 10 4 to 10 8 centistokes and a volume resistivity of 10 12 -10 17 Ω·cm at 25° C.
Claim 17
Dependent Claim
38 words
An electrorheological semisolid according to claim 13, wherein the electric insulating oil or electric insulating polymer has a viscosity of 10 4 -10 6 centistokes and a volume resistivity of 10 13 -10 17 Ω·cm at 25° C.
Claim 18
Dependent Claim
27 words
An electrorheological semisolid according to claim 11, wherein the electric insulating oil or electric insulating polymer is a silicone oil, a silicone polymer or a fluorosilicone oil.
Claim 19
Dependent Claim
19 words
An electrorheological semisolid according to claim 11, wherein the carbonaceous particulates have an average particle size of 1-100 μm.
Claim 20
Dependent Claim
17 words
An electrorheological semisolid according to claim 11, wherein the carbonaceous particulates contains 80-97 weight % of carbon.
Claim 21
Dependent Claim
21 words
An electrorheological semisolid according to claim 11, wherein the carbonaceous particulates have a volume resistivity of 10 5 -10 11 Ω·cm.
Claim 22
Dependent Claim
82 words
An electrorheological semisolid according to claim 11, wherein the carbonaceous particulates are selected from the group consisting of particulates of finely pulverized coal-tar pitch, petroleum pitch or pitch obtained by thermal decomposition of polyvinylchloride; carbonaceous mesophase spherules obtained by heat-treatment of these pitch or tar component to form optically anisotropic spherules and separating residual pitch component with solvents; pulverized products of these spherules; pulverized bulk mesophase obtained by heat-treatment of raw material pitches; pulverized partially crystallized pitch; and low-temperature carbonized thermosetting resins.
Claim 23
Dependent Claim
18 words
An electrorheological semisolid according to claim 19, wherein the low-temperature carbonized thermosetting resins are carbonized phenolic resin microbeads.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-10-03 | 1998-04-04 | 1998-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-03 | 2002-04-04 | 2002-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-03 | 2006-04-04 | 2006-10-04 | $7700.00 | Window Closed / Lapsed |