Donald R. Trott

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St. Cloud, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Butterfly valve having cartridge construction with improved bearings
- Patent number 4,225,113
- Issue date Sep 30, 1980
- General Signal Corporation
- Paul J. Barthelemy
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Butterfly valve with improved shaft connection
- Patent number 4,225,114
- Issue date Sep 30, 1980
- General Signal Corporation
- Paul J. Barthelemy
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...