Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9474988 | Variable speed system to motorize counterweight line sets | Charles B Shatzkin, Andrew McArthur | 2016-10-25 |
| 7264228 | Counterweight assisted winch | Thomas S. Young | 2007-09-04 |
| 7165295 | Rope lock with out-of-balance indicator and automatic lockout | Frank DeWitt | 2007-01-23 |
| 6855063 | Arbor guide shoe assembly for counterweight system | Michael Murphy | 2005-02-15 |