Inventor
Wolfgang Hellmund
Inventor
Viersen, DE
Overview
Patents· 2 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling50%
F16LPipes50%
Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977Patents assigned to MANNESMANN ROEHREN WERKE AG (1)· patent assignee history
1977–1979Based in Viersen, DE· patent location history
1979Patents assigned to MANNESMANN AG (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| MANNESMANN AG | 1 | 1979 |
| MANNESMANN ROEHREN WERKE AG | 1 | 1977 |
Locations
| Location | Patents | Span |
|---|---|---|
| Viersen, DE | 2 | 1977–1979 |