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. 27, 1990
Filed:
Aug. 31, 1989
Applicant:
Inventor:
Wallace W Yau, Newark, DE (US);
Assignee:
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 6 / ; 73 643 ;
Abstract
There is disclosed apparatus and method for determining molecular weight by osmometry. A fluid circuit is used having two pressure measurement zones, one responsive only to viscosity effects and the other to both viscosity and osmotic effects. The osmotic effects are caused by cross-linked polymeric material within one zone capable of expanding and contracting in response to the presence of a solvent and a solution, respectively, thereby changing the effective radius of the zone and hence the pressure.