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:
Jan. 11, 2005
Filed:
Sep. 18, 2001
James Reynolds Henshaw, Stroud, GB;
Richard John Hoodless, Bristol, GB;
James Reynolds Henshaw, Stroud, GB;
Richard John Hoodless, Bristol, GB;
Renishaw PLC, Gloucestershire, GB;
Abstract
Disclosed is an optical measurement scalecomplementary scale readerfor determining displacement between the scale and reader. The scaleand readerare adapted for use with a liquid C which provides optical communication between the scaleand the reader. The liquid C is preferably machine coolant or oil. The scale is preferably a stainless steel strip having periodic markings thereon. The scale reader has a windowwhich may have a hard coating (FIG.) thereon, e.g. diamond-like carbon, to prevent surface damage. The scale and reader may be mutually displaced with a shortage of liquid without undue adverse affects. Rotary mutual displacement between the scale and reader is discussed.