Inventor
Wouter Johannes Gregorius Keultjes
Inventor
Rijswijk, NL
Overview
Patents· 1 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling100%
PatentTitleYear
6,327,539'Method of determining drill string stiffness'2001Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
2001Patents assigned to SHELL OIL CO (1)· patent assignee history
2001Based in Rijswijk, NL· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SHELL OIL CO | 1 | 2001 |
Locations
| Location | Patents | Span |
|---|---|---|
| Rijswijk, NL | 1 | 2001 |