1
Craig L Cooper, Fred T Klein: Battery charger having temperature compensated charge rate. Phillips Petroleum Company, George E Bogatie, May 19, 1987: US04667143 (152 worldwide citation)

A battery charging circuit is disclosed which rapidly charges a battery from some level of discharge, including fully discharged, to fully charged without endangering the battery. The charging circuit includes a control circuit which provides switching type regulation responsive to current, voltage ...


2
Fred T Klein: Method and apparatus for testing a plurality of geophones. Phillips Petroleum Company, December 28, 1982: US04366561 (16 worldwide citation)

In a seismic exploration system wherein a plurality of geophones are utilized to detect seismic waves and transduce the detected seismic waves into representative electrical signals, method and apparatus is provided whereby a plurality of remotely located geophones can be tested from a central locat ...


3
Starnes E Walker, Fred T Klein: Chromatographic analyzer detector and method. Phillips Petroleum Company, September 7, 1982: US04348115 (7 worldwide citation)

An optical absorbance detector which can be used in process chromatographic analyzers is provided. Improvements are provided in noise reduction, temperature stability, operator convenience and construction. Noise reducing features include electrical signal filtering and optical system alignment. Tem ...