Patent EP0311984A2 successfully refreshed from Google Patents.
EP0311984A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in or relating to electro-rheological fluids
Assignee: Wyeth Holdings LLC
•
Filing: 1988-10-11
•
Granted: —
•
Expires: 2008-10-11
Abstract
Abstract An electro-rheological fluid comprises a solid phase dispersed in a base liquid comprising a polyfluoroalkylmethyl siloxane.
Inventors
- 👤 Douglas Alan Brooks
- 👤 Sivakumar Kandian
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 07:00
CPC Classifications
C; C10; C10M; C10M107/00; C10M107/50; C10M125/00; C10M125/26; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C10M145/40; C10M169/00; C10M169/04; C10M171/00; C10M171/001; C10M2201/00; C10M2201/087; C10M2201/10; C10M2201/102; C10M2201/105; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/12; C10M2227/00; C10M2227/09; C10M2229/00; C10M2229/02; C10M2229/025; C10M2229/04; C10M2229/0405; C10M2229/041; C10M2229/0415; C10M2229/042; C10M2229/0425; C10M2229/043; C10M2229/0435; C10M2229/044; C10M2229/0445; C10M2229/045; C10M2229/0455; C10M2229/046; C10M2229/0465; C10M2229/047; C10M2229/0475; C10M2229/048; C10M2229/0485; C10M2229/05; C10M2229/0505; C10M2229/051; C10M2229/0515; C10M2229/052; C10M2229/0525; C10M2229/053; C10M2229/0535; C10M2229/054; C10M2229/0545; C10N; C10N2010/00; C10N2010/02; C10N2010/04; C10N2010/06; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17; C10N2040/175; C10N2040/18; C10N2040/185; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
23 words
An electro-rheological fluid of the type comprising a solid phase dispersed in a base liquid, wherein the base liquid comprises a polyfluoroalkylmethyl siloxane.
Claim 2
Dependent Claim
23 words
An electro-rheological fluid of the type comprising a solid phase dispersed in a base liquid, wherein the base liquid comprises a polyfluoroalkylmethyl siloxane.
Claim 3
Dependent Claim
23 words
An electro-rheological fluid according to Claim 1, wherein said base liquid contains at least one compound selected from polymethyl 3,3,3-trifluoropropylsiloxane and polymethyl 1,1,2,2-tetrahydroperfluorooctylsiloxane.
Claim 4
Dependent Claim
34 words
An electro-rheological fluid according to Claim 2, wherein said polymethyl 3,3,3-trifluoropropylsiloxane has the general formula: wherein n is selected to provide a liquid having an average molecular weight of about 500 to about 15,000.
Claim 5
Dependent Claim
21 words
An electro-rheological fluid according to Claim 1, wherein said base liquid has a viscosity up to about 10,000 cs at 25°C.
Claim 6
Dependent Claim
23 words
An electro-rheological fluid according to Claim 4, wherein said base fluid has a viscosity of about 30 to about 1,000 cs at 25°C.
Claim 7
Dependent Claim
22 words
An electro-rheological fluid of Claim 5, wherein said base fluid has a viscosity of about 30 to about 500 cs at 25°C.
Claim 8
Dependent Claim
23 words
An electro-rheological fluid according to Claim 6, wherein said base fluid has a viscosity of about 80 to about 300 cs at 25°C.
Claim 9
Dependent Claim
23 words
An electro-rheological fluid according to Claim 7, wherein said base fluid has a viscosity of about 80 to about 100 cs at 25°C.
Claim 10
Dependent Claim
34 words
An electro-rheological fluid according to Claim 1, wherein said dispersed phase contains at least one solid compound selected from: a) an acid group-containing polymer; b) silica gel; c) starch; and d) an electronic conductor.
Claim 11
Dependent Claim
24 words
An electro-rheological fluid according to Claim 9, wherein said compound is an acid group-containing polymer in which said acid groups are free or neutralized.
Claim 12
Dependent Claim
14 words
An electro-rheological fluid according to Claim 10, wherein said polymer is an addition polymer.
Claim 13
Dependent Claim
42 words
An electro-rheological fluid according to Claim 11, wherein said addition polymer is derived from at least one monomer which contains at least one acid group and/or at least one group which is convertible to an acid group after polymerization of the monomer.
Claim 14
Dependent Claim
30 words
An electro rheological fluid according to Claim 12, wherein said addition polymer is derived from one or more monomers selected from acrylic acid, methacrylic acid, methyl acrylate and methyl methacrylate.
Claim 15
Dependent Claim
24 words
An electro-rheological fluid according to Claim 10, wherein at least a proportion of the acid groups of the polymer are neutralized to form salts.
Claim 16
Dependent Claim
28 words
An electro-rheological fluid according to Claim 14, wherein the acid groups are neutralized by a metal cation selected from Groups I, II and III of the Periodic Table.
Claim 17
Dependent Claim
22 words
An electro-rheological fluid according to Claim 15, wherein the metal cation is selected from lithium, sodium, potassium, copper, magnesium, aluminium and chromium.
Claim 18
Dependent Claim
16 words
An electro-rheological fluid according to Claim 16, wherein the polymer is a salt of polymethacrylic acid.
Claim 19
Dependent Claim
13 words
An electric-rheological fluid according to Claim 17, wherein the salt is a lithium.
Claim 20
Dependent Claim
15 words
An electro-rheological fluid according to Claim 9, wherein said electronic conductor is an organic semiconductor.
Claim 21
Dependent Claim
21 words
An electro-rheological fluid according to Claim 1, wherein the solid phase has a particle size of from 1 to 50 microns.
Claim 22
Dependent Claim
20 words
An electro-rheological fluid according to Claim 1, wherein the fluid contains from 20% to 40% V/V of the solid phase.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.