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:
Mar. 30, 2004
Filed:
Aug. 13, 2001
Gavin J. C. Braithwaite, Cambridge, MA (US);
Stephen H. Spiegelberg, Winchester, MA (US);
Gareth H. McKinley, Acton, MA (US);
Cambridge Polymer Group, Inc., Boston, MA (US);
Abstract
Apparatus and methods for evaluating the rheological properties of Newtonian and non-Newtonian liquids and melts employs the principle of capillary breakup following rapid stretching of the fluid between two plates. The apparatus includes opposed surfaces defining a sample site disposed therebetween. A liquid sample undergoes an extensional deformation between the opposed surfaces which separate using a user-defined motion profile. The time profile of the diameter of the liquid filament is monitored and recorded as a function of time. Preferred embodiments of the present invention include data analysis of the diameter of the filament as a function of time which provides information regarding rheological parameters including, but not limited to, extensional viscosity versus strain.