1
Robert H Hammerle: Method and apparatus for measuring viscosity in a liquid utilizing a piezoelectric sensor. Ford Motor Company, Paul K Godwin Jr, Clifford L Sadler, May 3, 1988: US04741200 (45 worldwide citation)

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 ...


2
Robert H Hammerle: Resistive oil quality sensor. Ford Motor Company, Paul K Godwin Jr, Clifford L Sadler, July 26, 1994: US05332961 (16 worldwide citation)

An on-board oil quality sensor for use in an internal combustion engine formed of a pair of resisitve elements mounted on a common substrate, wherein one of the resistive elements is exposed to the oil for corrosion as the oil contaminants increase and the other resistive element is protectively sea ...


3
Robert H Hammerle, Ching Hsong Wu: Process for treatment of exhaust gases. Ford Motor Company, William E Johnson, Olin B Johnson, May 15, 1984: US04448756 (11 worldwide citation)

This specification discloses a process for treatment of exhaust gases from an internal combustion engine. The process has the following general steps. A hydrocarbon fuel is burned in an internal combustion engine to generate exhaust gases containing various amounts of hydrocarbons, carbon monoxide, ...