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:
Feb. 08, 2000
Filed:
Oct. 18, 1996
John P Sottery, Milford, CT (US);
Bristol-Myers Squibb Company, New York, NY (US);
Abstract
A fully automated computer controlled system and method to simultaneously measure in a dynamic mode the streaming potential, impedance and permeability resulting from a flow of various liquids through a sample, particularly a compressed mass of human hair. The system includes four air-pressurized reservoirs and three test cells, each test cell containing a sample to be tested. An impedance measurement is made by impressing a signal wave train across each sample over a selected range of frequencies, preferably in the 10-10,000 Hz range, rather than at a single frequency. The air pressure is controlled within 2% of a selected pressure and the outlet flow of liquid from the test cells is continually measured to provide an accurate and reproducible set of measurements.