Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4825165 | Method and apparatus for detecting a transient phenomenon by monitoring variations of an alternating component of a vertical current emanating from the earth's surface | Ronald Helms | 1989-04-25 |
| 4820970 | Apparatus and method for using microwave radiation to measure water content of a fluid | — | 1989-04-11 |
| 4812739 | Apparatus and method for using microwave radiation to measure water content of a fluid | — | 1989-03-14 |