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. 16, 1985
Filed:
Jul. 06, 1982
Applicant:
Inventors:
Walter T Welford, London, GB;
Andrew D Stewart, Ashampstead, Reading, Berkshire, GB;
John S Dodson, Cobham, Surrey, GB;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
356 30 ; 356376 ;
Abstract
Method and apparatus for examining a gemstone to determine a parameter thereof. A thin beam of light is projected onto the stone, the beam is moved relative to the stone, the position where the beam strikes the stone is sensed in a direction different from that in which the beam is projected, and a parameter is determined making use of information derived from such sensing.