William Elder

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Richmond, VA, US

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Patents Grantslast 30 patents

Information Patent Grant
Otangular fitting family for flat-oval duct systems and method for...
- Patent number 5,878,786
- Issue date Mar 9, 1999
- William Elder
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Integral HVAC reinforced duct system and method for reinforcing duct
- Patent number 5,660,212
- Issue date Aug 26, 1997
- William Elder
- F24 - HEATING RANGES VENTILATING