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:
May. 03, 1994
Filed:
Mar. 05, 1992
Applicant:
Inventors:
John B Desjardins, Watertown, MA (US);
William W Seifert, Wellesley Hills, MA (US);
Vernon C Westcott, Lincoln, MA (US);
Assignee:
Analysts, Inc., Torrance, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
356 70 ; 356246 ; 356436 ; 356440 ;
Abstract
Method and apparatus for determining the concentration of optically attenuating materials in fluids, such as soot in diesel engine lubricating oils. An optical cell is employed in the form of a very thin tapered sample volume which is inserted into a light beam. The attenuation of the beam is measured at a plurality of locations along the varying thickness of the sample.