Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7908898 | Method and device for the integral molding of a flange to the end of a round or oval pipe of thin-walled sheet metal and pipe produced by the method | — | 2011-03-22 |
| 7661730 | Clamping ring for connecting thin-walled tubes | — | 2010-02-16 |
| 7464453 | Process for butt joining two pipe segments and producing a connecting flange | — | 2008-12-16 |
| 7073826 | Butt joint between two pipe segments of sheet metal and process for manufacture thereof | — | 2006-07-11 |
| 6109665 | Butt joint of air duct sections | — | 2000-08-29 |
| 5346265 | Coupling sleeve for connecting thin-walled pipe ends | — | 1994-09-13 |
| 5133580 | Butt connection between two air duct sections made sheet of metal | — | 1992-07-28 |
| 5129690 | Apparatus for connecting the ends of a pair of oval duct sections | Peter J. Arnoldt, Frederick J. Arnoldt | 1992-07-14 |
| 5103549 | Method for connecting the ends of a pair of oval duct sections | Peter J. Arnoldt, Frederick J. Arnoldt | 1992-04-14 |
| 4865365 | Air duct section having a connecting flange formed by bending up the ends of the air duct walls | — | 1989-09-12 |
| 4822083 | Butt joint between two thin-walled round sheet metal pipe sections | — | 1989-04-18 |
| 4739802 | Air duct section with form fitted connecting flange | — | 1988-04-26 |
| 4679832 | Flange ring for pipes | — | 1987-07-14 |
| 4558582 | Apparatus for flanging ventilation duct walls | — | 1985-12-17 |
| 4552388 | Corner angle assembly | — | 1985-11-12 |
| 4516797 | Flanged ring for tubes | — | 1985-05-14 |