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. 28, 2006
Filed:
Feb. 14, 2002
Applicants:
Michael Homer, Dursley, GB;
Alan James Holloway, Wotton-under-Edge, GB;
Iain Robert Gordon-ingram, Marshfield, GB;
Inventors:
Michael Homer, Dursley, GB;
Alan James Holloway, Wotton-under-Edge, GB;
Iain Robert Gordon-Ingram, Marshfield, GB;
Assignee:
Renishaw PLC, Gloucestershire, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D 5/34 (2006.01);
U.S. Cl.
CPC ...
Abstract
A measurement scale () is movable in plane x relative to a mask () and photodetector (). When a pattern of apertures in the mask () are in correlation with a pattern of apertures e.g. a reference mark in the scale () then light bands a b and c may propagate to the detector (). The relative sizes of the patterns is such that the light bands converge at the detector (). Other embodiments show light divergent and light inversion correlation of incongruent patterns.