loadpatents
Patent applications and USPTO patent grants for Lenze; Friedrich.The latest application filed is for "pipe connector".
Patent | Date |
---|---|
Pipe connector Grant 6,585,299 - Quadflieg , et al. July 1, 2 | 2003-07-01 |
Pipe connector App 20020017788 - Krug, Gerhard ;   et al. | 2002-02-14 |
Pipe joint Grant 6,155,613 - Quadflieg , et al. December 5, 2 | 2000-12-05 |
Pipeline with threaded pipes and a sleeve connecting the same Grant 5,394,823 - Lenze March 7, 1 | 1995-03-07 |
Screwed pipe joint Grant 5,048,871 - Pfeiffer , et al. September 17, 1 | 1991-09-17 |
Fluidtight pipe joint Grant 4,611,838 - Heilmann , et al. September 16, 1 | 1986-09-16 |
Gas tightly sealed joint in oil field tubular goods Grant 4,595,219 - Lenze , et al. June 17, 1 | 1986-06-17 |
Method for surface treatment of threading Grant 4,414,247 - Hubecker , et al. November 8, 1 | 1983-11-08 |
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