Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9725909 | Gutter cleaning device and system | — | 2017-08-08 |
| 5201007 | Apparatus and method for conveying amplified sound to ear | M. Duncan MacAllister | 1993-04-06 |
| 5068902 | Method and apparatus for reducing acoustical distortion | — | 1991-11-26 |
| 5031219 | Apparatus and method for conveying amplified sound to the ear | M. Duncan MacAllister | 1991-07-09 |
| 4811402 | Method and apparatus for reducing acoustical distortion | — | 1989-03-07 |