Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4814610 | Method for more accurately determining thermal neutron decay time constants | Bruce T. Murdoch | 1989-03-21 |
| 4805156 | System for acoustically determining the quality of the cement bond in a cased borehole | James R. Birchak, Robert A. Lester | 1989-02-14 |