Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6318457 | Multilateral well and electrical transmission system | Johannis Josephus Den Boer, Anthony Evert Kuperij, John Foreman Stewart | 2001-11-20 |
| 6244337 | System for sealing the intersection between a primary and a branch borehole | Francis Alexander Cumming, Wilhelmus Christianus Maria Lohbeck | 2001-06-12 |
| 6070671 | Creating zonal isolation between the interior and exterior of a well system | Francis Alexander Cumming, Robert B. Stewart | 2000-06-06 |