US4687589A
Expired / Lapsed
US
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Electronheological fluids
Assignee: BTG International Ltd
•
Filing: 1986-01-27
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Granted: 1987-08-18
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Expires: 2006-01-27
Abstract
Abstract An electrorheological fluid which comprises a liquid continuous phase and, dispersed therein, at least one dispersed phase and which is capable of functioning as such when at least the dispersed phase is substantially anhydrous.
Inventors
- 👤 Hermann Block
- 👤 Jeffrey P. Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:53
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/128; C; C08; C08G; C08G61/00; C08G61/12; C10; C10M; C10M171/00; C10M171/001
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
34 words
An electrorheological fluid which comprises a liquid continuous phase and, dispersed therein, at least one dispersed phase and which is capable of functioning as such when at least the dispersed phase is substantially anhydrous.
Claim 2
Dependent Claim
34 words
An electrorheological fluid which comprises a liquid continuous phase and, dispersed therein, at least one dispersed phase and which is capable of functioning as such when at least the dispersed phase is substantially anhydrous.
Claim 3
Dependent Claim
20 words
An electrorheological fluid according to claim 1 which is capable of functioning as such when the fluid is substantially anhydrous.
Claim 4
Dependent Claim
15 words
An electrorheological fluid according to claim 1 wherein the dispersed phase comprises an electronic conductor.
Claim 5
Dependent Claim
14 words
An electrorheological fluid according to claim 3 wherein the electronic conductor is a semiconductor.
Claim 6
Dependent Claim
16 words
An electrorheological fluid according to claim 4 wherein the semiconductor comprises an unsaturated fused polycyclic system.
Claim 7
Dependent Claim
16 words
An electrorheological fluid according to claim 5 wherein the unsaturated fused polycyclic system is electron rich.
Claim 8
Dependent Claim
19 words
An electrorheological fluid according to claim 5 wherein the unsaturated fused polycyclic system is an aromatic fused polycyclic system.
Claim 9
Dependent Claim
13 words
An electrorheological fluid according to claim 5 wherein the organic semiconductor is polymeric.
Claim 10
Dependent Claim
15 words
An electrorheological fluid according to claim 8 wherein the organic semiconductor comprises a poly(acene-quinone) polymer.
Claim 11
Dependent Claim
36 words
An electrorheological fluid according to claim 9 wherein the poly(acene-quinone) polymer is produced by reacting, under Friedel-Crafts acylation conditions, at least one substituted or unsubstituted acene with at least one substituted or unsubstituted polyacylated aromatic compound.
Claim 12
Dependent Claim
16 words
An electrorheological fluid according to claim 1 wherein the continuous phase comprises a halogenated aromatic liquid.
Claim 13
Dependent Claim
25 words
An electrorheological fluid according to claim 1 wherein the loading of the dispersed phase in the continuous phase is from 15% v/v to 40% v/v.
Claim 14
Dependent Claim
38 words
An electrorheological fluid according to claim 1 which is capable of developing a static yield stress of at least 0.5 KPa under an applied electric field of no more than 3MVm -1 when the fluid is substantially anhydrous.
Claim 15
Dependent Claim
38 words
An electrorheological fluid according claim 1 which is capable of passing a current density of no more than 400 Am -2 under an applied electric field of no more than 1MVm -1 when the fluid is substantially anhydrous.
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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) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |