Ruth Zelczer

Follow

Person

Cleveland Heights, OH, US

People

Patents Grantslast 30 patents

Information Patent Grant
Fluid flow control damper assembly and method
- Patent number 6,105,927
- Issue date Aug 22, 2000
- Alex Zelczer
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Pipe and duct run locator
- Patent number 5,553,498
- Issue date Sep 10, 1996
- Alex Zelczer
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Fluid flow control damper assembly and method
- Patent number 5,458,148
- Issue date Oct 17, 1995
- Alex Zelczer
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Flow control bladders for zone control apparatus
- Patent number 5,170,986
- Issue date Dec 15, 1992
- Alex Zelczer
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Zone control and smoke damping apparatus for central heating and/or...
- Patent number 4,848,654
- Issue date Jul 18, 1989
- Alex Zelczer
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Zone control apparatus for central heating and/or cooling systems
- Patent number 4,702,412
- Issue date Oct 27, 1987
- Alex Zelczer
- F24 - HEATING RANGES VENTILATING