Fredrick J. Arnoldt

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Bethel Park, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus for connecting the ends of a pair of oval duct sections
- Patent number 5,135,270
- Issue date Aug 4, 1992
- Ductmate Industries, Inc.
- Peter J. Arnoldt
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Apparatus for connecting the ends of a pair of oval duct sections
- Patent number 5,129,690
- Issue date Jul 14, 1992
- Ductmate Industries, Inc.
- Manfred Meinig
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Method for connecting the ends of a pair of oval duct sections
- Patent number 5,103,549
- Issue date Apr 14, 1992
- Ductmate Industries, Inc.
- Manfred Meinig
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Automatic duct welding machine
- Patent number 4,639,574
- Issue date Jan 27, 1987
- Ductmate Industries, Inc.
- Peter J. Arnoldt
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR