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:
Jul. 23, 1991
Filed:
Sep. 14, 1989
Applicant:
Inventor:
William F Stephens, Badminton, GB;
Assignee:
Renishaw PLC, Gloucestershire, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; H01J / ;
U.S. Cl.
CPC ...
35016217 ; 2502 / ;
Abstract
A scale for use with scale reading apparatus having grooves spaced along its length at a pitch P. Each groove is made with a shape or depth variation along its length to provide a scatter mechanism for breaking up the ordered diffraction pattern which would otherwise be generated by the grating structure defined by the grooves. Methods of making the scale involve applying a transverse vibration to the cutting tool during the groove cutting operation.