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:
Sep. 09, 2008
Filed:
Dec. 05, 2006
Ken Stephen Schermacher, Chadds Ford, PA (US);
Anthony J. Martino, West Chester, PA (US);
Matthew Paul Reinhardt, Richmond, VA (US);
Thomas W. Simpson, Iii, Boothwyn, PA (US);
Jason R. Juhasz, Hockessin, DE (US);
Jeff B. Alspach, Lake Orion, MI (US);
Ken Stephen Schermacher, Chadds Ford, PA (US);
Anthony J. Martino, West Chester, PA (US);
Matthew Paul Reinhardt, Richmond, VA (US);
Thomas W. Simpson, III, Boothwyn, PA (US);
Jason R. Juhasz, Hockessin, DE (US);
Jeff B. Alspach, Lake Orion, MI (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A flow cell for measuring the color properties of a liquid flowing through the flow cell using interrogating radiation at a predetermined wavelength has a thin partition mounted in spaced relationship between both a window and a base of the cell. The partition has a predetermined index of refraction and has a thickness dimension that is less than that of the window. The spacing between the partition and the window is such that evanescent coupling of radiation reflected from the liquid into the material of the window is prevented. Typically, this spacing is a distance not less than three (3) times the predetermined maximum wavelength in the wavelength range of interrogating radiation. A plurality of spacer elements may be disposed in the air cavity to maintain the spaced relationship between the partition and the window. The flow cell has a liquid supply passage and a liquid removal passage formed therein. The liquid supply passage, the sample chamber and the liquid removal passage cooperate to define a liquid flow path through the flow cell. The liquid supply passage, the sample chamber and the liquid removal passage are configured such that any cross section taken in a plane substantially perpendicular to the liquid flow path at any location therealong exhibits substantially the same cross-sectional area.