Johanson; Donald L.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Johanson; Donald L..The latest application filed is for "battery operated miniature syringe infusion pump".
- Johanson; Donald L. - Wayland MA
| Patent | Date |
|---|---|
| Battery operated miniature syringe infusion pump Grant 4,544,369 - Skakoon , et al. October 1, 1 | 1985-10-01 |
| Hearing aid Grant D266,271 - Johanson , et al. September 21, 1 | 1982-09-21 |
| Modular in-the-ear hearing aid Grant 4,069,400 - Johanson , et al. January 17, 1 | 1978-01-17 |
| Directional/non-directional hearing aid Grant 3,975,599 - Johanson August 17, 1 | 1976-08-17 |
| Directionally variable hearing aid Grant 3,909,556 - Johanson September 30, 1 | 1975-09-30 |
| Hearing Aid Having Selectable Directional Characteristics Grant 3,836,732 - Johanson , et al. September 17, 1 | 1974-09-17 |
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