Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5012181 | Apparatus for and method of internally calibrating an electrical calibrator | — | 1991-04-30 |
| 4933631 | Digital AC meter | — | 1990-06-12 |
| 4859936 | Method of and apparatus for determining AC calibration errors and apparatus using device with AC calibration errors | — | 1989-08-22 |
| 4841170 | Temperature controlled hybrid assembly | — | 1989-06-20 |
| 4841229 | Method of and circuit for ohmmeter calibration | — | 1989-06-20 |
| 4795995 | Method and apparatus for producing electromagnetic surveillance fields | James C. Cook, II, Earl Goodrich, II | 1989-01-03 |
| 4744018 | Regulated power supply | — | 1988-05-10 |
| 4716398 | Linearity control circuit for digital to analog converter | John C. Emery | 1987-12-29 |
| 4668942 | Signal analysis apparatus including recursive filter for electromagnetic surveillance system | Earl Goodrich, II, Manot Swasdee | 1987-05-26 |
| 4634975 | Method and apparatus for producing electromagnetic surveillance fields | James C. Cook, II, Earl Goodrich, II | 1987-01-06 |
| 4585987 | Regulated voltage supply with sense current cancellation circuit | Walter W. Prue, Jr. | 1986-04-29 |
| 4535323 | Preamplifying and signal processing method and apparatus for theft detection systems | — | 1985-08-13 |
| 4524350 | Detection logic and signal processing method and apparatus for theft detection systems | — | 1985-06-18 |