Patents by Inventor Gerhard Krug
Gerhard Krug has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6585299Abstract: A pipe joint with a sleeve element, which has an internal thread, and with a spigot element, which has an external thread which can be screwed to said internal thread. One element has a constant pitch throughout and the other element, with two sections extending in each case from the ends of the threaded length is likewise provided with a constant pitch. The other element has more than two sections with a pitch which is constant within the section but is different from the first-mentioned element, it being the case that the pitch difference at least of one section is in the opposite direction, in terms of sign, to the rest of the sections. The pitch difference of one section is at least double that of the adjacent sections and in the screwed-together position, in the section with the large pitch difference, the thread play and the thread tolerances are compensated and the load flank of one corner tooth of this section, with the guide flank of the other corner tooth, produces the basic bracing.Type: GrantFiled: March 27, 2000Date of Patent: July 1, 2003Assignee: Mannesmann AGInventors: Erich Quadflieg, Gerhard Krug, Friedrich Lenze, Martin Schlüter
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Patent number: 6513840Abstract: A boring rod connector with a journal element that has a tapered external thread section located between an outer shoulder and a journal face, a thread-free section located between the outer shoulder and the external thread section, and a thread-free section located between the external thread section and the journal face, and with a sleeve element that can be screwed to the journal element and has a tapered internal thread section located between an inner shoulder and a sleeve face, a thread-free section located between the inner shoulder and the internal thread section, and a thread-free section located between the internal thread section and the sleeve face. The thread-free sections of the journal element and the sleeve element located in the area of the inner shoulder that, when a screw connected exists, lie opposite to each other, have a different length than the thread-free sections of the journal element and the sleeve element located in the region of the inner shoulder.Type: GrantFiled: December 18, 2000Date of Patent: February 4, 2003Assignee: Mannesmann AGInventors: Gerhard Krug, Erich Quadflieg
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Patent number: 6511102Abstract: A pipe connector having a pin element having a tapered outer threaded section between an external shoulder and a pin end face, a first threadless pin section between the external shoulder and the outer threaded section, and a second threadless pin section between the outer threaded section and the pin end face. Provided for threaded engagement with the pin element is a box element having a tapered inner threaded section between an internal shoulder and a box end face, a first threadless box section between the internal shoulder and the inner threaded section, and a second threadless box section between the inner threaded section and the box end face. Suitably, the second threadless pin section and the first threadless box section in the area of the internal joint is at least twice as long as the first threadless pin section and the second threadless box section in the area of the external joint.Type: GrantFiled: July 10, 2001Date of Patent: January 28, 2003Assignee: Vallourec Mannesmann Oil & Gas Germany GmbHInventors: Gerhard Krug, Friedrich Lenze, Erich Quadflieg
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Publication number: 20020017788Abstract: A pipe connector having a pin element having a tapered outer threaded section between an external shoulder and a pin end face, a first threadless pin section between the external shoulder and the outer threaded section, and a second threadless pin section between the outer threaded section and the pin end face. Provided for threaded engagement with the pin element is a box element having a tapered inner threaded section between an internal shoulder and a box end face, a first threadless box section between the internal shoulder and the inner threaded section, and a second threadless box section between the inner threaded section and the box end face. Suitably, the second threadless pin section and the first threadless box section in the area of the internal joint is at least twice as long as the first threadless pin section and the second threadless box section in the area of the external joint.Type: ApplicationFiled: July 10, 2001Publication date: February 14, 2002Inventors: Gerhard Krug, Friedrich Lenze, Erich Quadflieg
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Patent number: 5048871Abstract: A screwed pipe joint with a bell for connecting two pipes of a drill pipe string.Type: GrantFiled: July 27, 1989Date of Patent: September 17, 1991Assignee: Mannesmann AktiengesellschaftInventors: Gerd Pfeiffer, Erich Quadflieg, Friedrich Lenze, Gerhard Krug, Josef Siekmeyer
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Patent number: 4153283Abstract: A box member and a pin member each have a tapered thread, an abutment end face and a shoulder for engagement respectively with shoulder and end face of the other member, one coacting surface pair being conical, the other one being planar. Shoulder and end face are spaced differently in the two members such that upon engagement of a conical shoulder and end face, planar end face and shoulder have a gap of about 0.5 to 2.5 per cent of the spacing. Taper/bulge seals are provided adjacent the abutment surfaces to be effective before the planar surfaces abut as the joint is made up. The effective pitch diameter of the pin member remains consistently smaller than the pitch diameter of the box member, at least up to an insertion of the pin member so that the planar surfaces abut.Type: GrantFiled: September 12, 1977Date of Patent: May 8, 1979Assignee: Mannesmann AktiengesellschaftInventors: Wolfgang Hellmund, Gerhard Krug, Gerhard Missaire, Kurt Roether, Paul Schatton