1
Souillard Michel: Method and apparatus for localizing phase-to-phase and phase-to-ground faults in power lines. Compteurs Schlumberger, Sherman William R, Roylance Abrams Berdo & Kaul, March 26, 1974: US3800215 (21 worldwide citation)

Disclosed is a method for localizing phase-to-phase and phase-to-ground faults such as short circuits in a polyphase power line. The method includes the steps of deriving three voltages u, v and w, u being proportional to the voltage of the faulty line loop, v being a reference voltage across a resi ...


2
Guy Seite, Michel Gauthier: Electronic ignition system for internal combustion engine. Compteurs Schlumberger, William R Sherman, Stewart F Moore, March 9, 1976: US03942491 (17 worldwide citation)

The crankshaft bears a mark which passes in front of a sensor. When the crankshaft is rotated as the engine turns, the sensor delivers a squarewave signal when this mark passes in front of it. The mark and the sensor are positioned with respect to each other such that when the end of the mark passes ...


3
Herrmann Pierre: Infrared gas analyzer. Compteurs Schlumberger, July 18, 1972: US3678262 (14 worldwide citation)

The analyzer comprises, in succession, an infrared ray source, a modulator, an analysis chamber containing the mixture of gasses, and a detector together with associated electronic circuits for processing the electric signals delivered by the detector. The modulator periodically interposes in the pa ...


4
Joseph Sauvignet Henri: System for controlling the ignition and injection of internal combustion engines. Compteurs Schlumberger, Sherman William R, August 20, 1974: US3830207 (14 worldwide citation)

Apparatus for controlling ignition and injection in internal combustion engines. The apparatus includes a first wiper carried by the engine crankshaft and having a series of identical sectors, a proximity detector assembly mounted opposite this crankshaft wiper, and also a timing wiper carried by th ...


5
Neuville Claude: Improved static remote-control relay selection system. Compteurs Schlumberger, Sherman William R, December 3, 1974: US3852722 (9 worldwide citation)

Disclosed is a static remote-control relay which can be controlled by a pulse train, comprising:A bistable memory,A controllable pulse generator, the control input of which is connected to a first output of the said bistable memory,A controllable counter whose reset control input is connected to the ...


6
Herrmann Pierre: Infrared absorption analysis method and apparatus for determining gas concentration. Compteurs Schlumberger, December 25, 1973: US3781910 (9 worldwide citation)

There is disclosed a dual beam gas analyzer and the mode of operation thereof for measuring small concentrations of a gas of interest in the presence of another gas having absorption bands overlapping those of the gas of interest. This is encountered in the determination of the concentration of CO.s ...


7
Carnel Alain: Input connections for differential amplifiers. Compteurs Schlumberger, December 11, 1973: US3778619 (8 worldwide citation)

Two polarized light beams from the same source are rotated by passage through Faraday rods having windings supplied by a current to be measured. The beams are then counterrotated by passage through second Faraday rods having windings supplied by a compensating current. Each beam is then applied to a ...


8
Frayssinoux Roland: Degassers. Compteurs Schlumberger, July 24, 1973: US3747302 (8 worldwide citation)

A degasser comprises vertically disposed inlet and outlet tubes, which are aligned with each other and which have their adjacent ends spaced apart to define a gap. An annular chamber surrounds the adjacent ends of the tubes so as to contain this gap. The inlet tube, which is beneath the outlet tube, ...


9
Marcel Coninx, Robert Ducousset: Flowmeter. Compteurs Schlumberger, William R Sherman, Stewart F Moore, Kevin McMahon, December 28, 1976: US03999432 (7 worldwide citation)

A flowmeter comprises an axial flow measurement turbine having a relatively thin turbine disc secured to a shaft which is supported on at least one axial bearing. At high flow rates, it is possible for a large pressure differential to build up between the opposite axial sides of the disc, subjecting ...


10
Randriamanentena Williams: Electric pulse generating apparatus for internal combustion engines. Compteurs Schlumberger, Sherman William A, Farley Walter C, May 13, 1975: US3882835 (6 worldwide citation)

Electric pulse generating apparatus is provided for the ignition system of an internal combustion engine. Apparatus comprises essentially means for delivering a voltage which is substantially-inversely proportional to the rotating speed of the engine, means for delivering a sawtooth voltage whose le ...