Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862424 | Interferometric means and method for accurate determination of fiberoptic well logging cable length | Swan A. Sie, Jorg A. Angehrn | 1989-08-29 |
| 4803479 | Electrical phase measurement means and method for accurate determination of well logging cable length | Swan A. Sie, Jorg A. Angehrn | 1989-02-07 |