The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 1999
Filed:
Apr. 10, 1997
Iain Rookes, Cambridgeshire, GB;
Paul John Smith, Cambridgeshire, GB;
Daniel Charmbury Ward, Bath, GB;
Perkins Engines Company Limited, Cambridgeshire, GB;
Abstract
An electro-magnetically operated valve which has a pole piece, an armature member mounted for movement relative to the pole piece, and an electro-magnetic device associated with the pole piece for effecting movement of the armature member between a first position spaced from the pole piece to a second position where the armature member contacts the pole piece, where at least a portion of the armature member and/or the pole piece has in or on a coating or layer of material having a higher mechanical hardness or a higher magnetic permeability than the material of the armature and/or pole piece.