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:
Jan. 10, 1989
Filed:
Mar. 05, 1987
Barry Blake-Coleman, Salisbury, GB;
David Clarke, Salisbury, GB;
Abstract
Apparatus for use in measuring fluid density comprises a fluid carrying helical sample tube 50 made of a conductive material for passing current therethrough. A cylindrical coil fixing sleeve 58 form surrounds the helical sample tube and engages the tube to prevent relative movement of the turns. A high flux permanent magnet 60 is carried on one post 54 and is aligned along the axis of the tube. The magnetic field established by magnet 60 and the pole extension 64 will subject each current-carrying length element of the sample tube to an axial force, the sum of these forces resulting in a bodily axial movement of the sample tube. The sample tube is excited to spring resonance by passing current through the sample tube. The resonant frequency is measured and is indicative of the mass of the fluid contained in the coil and thereby of the fluid density.