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. 26, 1993
Filed:
May. 29, 1992
Hans-Juergen Hoelscher, Hannover, DE;
Thomas Kerk, Clausthal-Zellerfeld, DE;
Wilfried Tuennermann, Giesen, DE;
Helmut Winnacker, Ehlershausen, DE;
Preussag Aktiengesellschaft, Hannover, DE;
Abstract
A hydromechanical signal transmitter for generating pressure pulses in a drilling fluid to transmit telemetry information of a well-logging operation includes a stator fixed in a cylindrical housing having at least a pair of axially aligned fluid passages, and a disc shaped rotor disposed between the passages, rotatable between a first limit position wherein an opening in the rotor passes drilling fluid flowing through the pair of passages and a second limit position wherein a disc portion of the rotor throttles the flow of the fluid. A revisable d.c. motor drives the rotor from one limit position to the other in response to information signals provided to the motor. Means is provided to stop the rotor at each limit position, including radial stop faces on a drive shaft connecting the motor to the rotor and a stop pin in the housing. A plurality of circumferentially spaced passages and rotor openings may be provided.