Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5122750 | Methods employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables | John B. Rippingale, Charles R. Upton, Erick O. Schonstedt | 1992-06-16 |
| 5017873 | Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables | John B. Rippingale, Charles R. Upton, Erick O. Schonstedt | 1991-05-21 |
| 5006806 | Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as burried fiber optic cables | John B. Rippingale, Charles R. Upton, Erick O. Schonstedt | 1991-04-09 |