Filing Information

Inventor(s)	Laurence Waino McKeen ·
Assignee(s)	E.I. du Pont de Nemours and Company ·  View assignee updates
Primary Examiner	Kenneth Thompson ·
Application Number	US11286599
Filing date	11/23/2005
Issue date	03/25/2008
Prior Publication Data	US20060108110 - 05/25/2006
Predicted expiration date	04/01/2026
Patent term adjustment	129
U.S. Classifications	166/242.1  · 428/369.1  · 166/902  ·
International Classifications	E21B1700  ·
Kind Code	B2
Related U.S. Application Data	CROSS-REFERENCE TO RELATED APPLICATION This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Ser. No. 60/630,779, filed Nov. 24, 2004.

Patent Family

Abstract

The present invention relates to a tool for use in an oil pipe having a fluoropolymer coating imparting substantially reduced adhesion of asphaltenes, paraffin wax, and inorganic scale, so as to reduce plugging of said tool, and impermeability to salt water so as to protect the tool pipe from corrosion. Such a tool is particularly useful in a pipe coated in a similar manner.

Independent Claims | See all claims (7)

1. 1. A tool for use in an oil pipe comprising a multi-layer coating including a primer layer adhered to its exterior surface and a overcoat adhered to said primer layer, wherein the coating comprises a barrier layer formed between the primer layer and the overcoat, and the barrier layer includes a plurality of particles which form a mechanical barrier against permeation of water, gas and solvents to the tool.