EP0074281A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Heating Diesel fuel
Assignee: Raychem Corp
•
Filing: 1982-09-09
•
Granted: —
•
Expires: 2002-09-09
Abstract
Abstract Conductive polymer compositions based on polyvinylidene fluoride have improved properties when the polyvinylidene fluoride has a very regular structure characterized by a low head-to-head content in the repeating units. The improved properties include improved electrical stability when contacted by organic fluids and/or when maintained at elevated temperatures in air. Such compositions are particularly useful in the form of self-limiting heaters, e.g. for heating diesel fuel.
Inventors
- 👤 Peter Van Konynenburg
- 👤 Andrew Au
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:56
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; H01C; H01C7/00; H01C7/02; H01C7/027; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
31 words
A conductive polymer composition which comprises a particulate conductive filler dispersed in polyvinylidene fluoride which has a head-to-head content of less than 5.0%, preferably less than 4.5%, particularly less than 4.0%.
Claim 2
Dependent Claim
31 words
A conductive polymer composition which comprises a particulate conductive filler dispersed in polyvinylidene fluoride which has a head-to-head content of less than 5.0%, preferably less than 4.5%, particularly less than 4.0%.
Claim 3
Dependent Claim
13 words
A composition according to Claim 2 wherein the conductive filler is carbon black.
Claim 4
Dependent Claim
12 words
A composition according to Claim 1 or 2 which exhibits PTC behavior.
Claim 5
Dependent Claim
38 words
An electrical device which comprises (i) a conductive polymer element composed of a composition as claimed in any one of claims 1 to 3; and (ii) at least one electrode in electrical contact with the conductive polymer element.
Claim 6
Dependent Claim
20 words
A device according to Claim 4 which is a self-regulating heater in which the conductive polymer composition exhibits PTC behavior.
Claim 7
Dependent Claim
26 words
A method of heating diesel fuel which comprises passing current through a self-regulating heater as claimed in Claim 5 which is immersed in the diesel fuel.
Claim 8
Dependent Claim
247 words
A fuel feedthrough and heating assembly which can be positioned and connected between a fuel filter and a fuel tank of a fuel supply system to provide means for heating fuel which is being pumped through a fuel line from the fuel tank to the fuel filter, said feedthrough and heating assembly comprising (A) a feedthrough comprising (i) a fuel conduit having at one end thereof a fuel.line connector for connecting the feedthrough to a fuel line and at the other end thereof a fuel filter connector for connecting the feedthrough to a fuel filter; and (ii) a neck portion which protrudes from the fuel conduit between the ends thereof and which comprises a chamber; (B) a flexible self-limiting strip heater as claimed in Claim 5 which comprises a fuel-resistant insulating jacket, one end of the strip heater being within the chamber of the neck portion, and the strip heater passing through the fuel line connector and protruding from the fuel conduit; (C) insulated electrical leads connected to the electrodes of the heater, the connections lying within the chamber of the neck portion; and (D) a fuel-resistant, water-resistant and insulating composition which encapsulates (i) the connections between the electrodes and the leads and (ii) the insulation at the ends of the connected electrical leads and (iii) the insulating jacket at the end of the heater; and (E) a fuel-resistant gasket which prevents fuel which is being pumped through the fuel conduit from exiting through the neck portion.
References Cited (Backward Citations)
DE1805906A1
Cited
FR2443123A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.