Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5135270 | Apparatus for connecting the ends of a pair of oval duct sections | Frederick J. Arnoldt | 1992-08-04 |
| 5129690 | Apparatus for connecting the ends of a pair of oval duct sections | Manfred Meinig, Frederick J. Arnoldt | 1992-07-14 |
| 5103549 | Method for connecting the ends of a pair of oval duct sections | Manfred Meinig, Frederick J. Arnoldt | 1992-04-14 |
| 5054823 | Flange type duct connector | — | 1991-10-08 |
| 5022688 | Flange type duct joint assembly and seal arrangement therefor | — | 1991-06-11 |
| 5015018 | Duct connector | — | 1991-05-14 |
| 4881762 | Duct connector for a circular duct | — | 1989-11-21 |
| 4867490 | Circular duct connector | — | 1989-09-19 |
| 4662661 | Flange type duct joint assembly and seal arrangement therefor | — | 1987-05-05 |
| 4639574 | Automatic duct welding machine | Fredrick Arnoldt | 1987-01-27 |
| 4584756 | Flange type duct joint assembly and seal arrangement therefor | — | 1986-04-29 |
| 4566724 | Duct joint frame | Waldemar H. Greiner | 1986-01-28 |
| 4509778 | Duct joint assembly | — | 1985-04-09 |
| 4508376 | Flange type duct joint assembly and seal arrangement therefor | — | 1985-04-02 |
| 4352003 | Method for positioning and securing components of a workpiece | — | 1982-09-28 |
| 4316072 | Apparatus for positioning and securing components of a workpiece | — | 1982-02-16 |
| 4218079 | Flange type duct joint assembly | — | 1980-08-19 |