Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D303706 | Fetal acoustic stimulator or similar article | — | 1989-09-26 |
| 4437467 | Apparatus for monitoring fetal heartbeat and the like | Joel N. Helfer | 1984-03-20 |
| 4284252 | Cartridge for strip chart recorders and method of using same | — | 1981-08-18 |