04741200 is referenced by 45 patents and cites 10 patents.

A piezoelectric element energized to exhibit thickness-shear mode vibration is utilized to measure the viscosity of liquids. Electrodes, of an inert material are bonded to the major faces of the disc shaped crystal and are of a lesser diameter than the crystal surfaces so as to provide a concentric ring area of the crystal that is unenergized.

Title
Method and apparatus for measuring viscosity in a liquid utilizing a piezoelectric sensor
Application Number
6/884824
Publication Number
4741200
Application Date
July 11, 1986
Publication Date
May 3, 1988
Inventor
Robert H Hammerle
Franklin
MI, US
Agent
Clifford L Sadler
Paul K Godwin Jr
Assignee
Ford Motor Company
MI, US
IPC
G01N 11/16
View Original Source