Inventor
Friedrich Lenze
Inventor
Ratingen, DE
Overview
Patents· 10 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
F16Lprimary
F16LPipes42%
E21BEarth or rock drilling37%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests11%
F04DNon-positive-displacement pumps5%
F16BDevices for fastening or securing constructional elements or machine parts together, e.g. nails, bolts, circlips, clamps, clips or wedges5%
PatentTitleYear
6,585,299'Pipe connector'20036,511,102'Pipe connector'20036,155,613'Pipe joint'20005,394,823'Pipeline with threaded pipes and a sleeve connecting the same'19955,275,445'Gas-tight pipe connection'19945,048,871'Screwed pipe joint'19914,955,644'Drill pipe coupling'19904,611,838'Fluidtight pipe joint'19864,595,219'Gas tightly sealed joint in oil field tubular goods'19864,414,247'Method for surface treatment of threading'1983Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1983–2003Patents assigned to MANNESMANN AG (9)· patent assignee history
1983Based in Dusseldorf, DE· patent location history
1986–2003Based in Ratingen, DE· patent location history
2003Patents assigned to VALLOUREC MANNESMANN OIL & GAS (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| MANNESMANN AG | 9 | 1983–2003 |
| VALLOUREC MANNESMANN OIL & GAS | 1 | 2003 |
Locations
| Location | Patents | Span |
|---|---|---|
| Ratingen, DE | 9 | 1986–2003 |
| Dusseldorf, DE | 1 | 1983 |