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. 10, 1985
Filed:
Aug. 17, 1984
Harold T Barnaby, Duncanville, TX (US);
Core Laboratories, Inc., Dallas, TX (US);
Abstract
A viscosimeter measures the viscosity of a fluid, such as a petroleum hydrocarbon liquid, by driving a capillary through the fluid and measuring the pressure drop across the capillary. The viscosimeter comprises a pressure cylinder, a piston within the cylinder having at least one capillary tube, and an arrangement for driving the piston at a known speed so that the fluid is displaced at a known volumetric rate through the capillary tube. Pressure sensors on either end of the cylinder measure the capillary pressure drop. In a preferred embodiment, the piston has a main body and a selector plate. The main body has a plurality of capillary tubes each of a different bore size, and the selector plate is rotatable relative to the main body by rotating a selector handle outside the cylinder. An oven enclosure permits the cylinder, and its fill of fluid, to be heated in an air bath to reservoir temperatures.