Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6154890 | Enlarged earcup with adjustable earseal and improved noise attenuation | John R. Deopuria | 2000-12-05 |
| 5023955 | Impact-absorbing sound-attenuating earcup | John A. Murphy | 1991-06-18 |
| 4713844 | Protective helmet with face mask sealing means | — | 1987-12-22 |
| 4700410 | Pneumatic adjustment means for earcups in helmets | — | 1987-10-20 |