Inventor · Onalaska, WI, US

Stephen A. Kujak

42Patents
6h-index
25Co-inventors
69Inventor score

Filing activity: Apr 15, 1996 → Mar 2, 2023

Most-cited inventions

PatentTitleAreaCited byStatus
US10465961B2 Refrigerant leak detection by use of fluid additive Mechanical Engineering; Lighting; Heating 19 Active
US6572689B2 Vapor/liquid separator for an absorption chiller Mechanical Engineering; Lighting; Heating 17 Expired
US9556372B2 Refrigerant compositions Chemistry; Metallurgy 13 Active
US5946937A Dual loop triple effect absorption chiller utilizing a common evaporator circuit Emerging Cross-Sectional Technologies 8 Expired
US5653117A Absorption refrigeration compositions containing thiocyanate, and absorption refrigeration apparatus Emerging Cross-Sectional Technologies 7 Expired
US10543737B2 Cascade heat transfer system Mechanical Engineering; Lighting; Heating 6 Active
US9879164B2 Refrigerant additives and compositions Chemistry; Metallurgy 5 Active
US5783104A Absorption refrigeration compositions having germanium based compounds Chemistry; Metallurgy 5 Expired
US9944839B2 Refrigerant compositions Chemistry; Metallurgy 3 Active
US11220620B2 Lower GWP refrigerant compositions Chemistry; Metallurgy 2 Active
US10655039B2 Lower GWP refrigerant compositions Chemistry; Metallurgy 2 Active
US11351842B2 Cascade heat transfer system Mechanical Engineering; Lighting; Heating 2 Active
US11162720B2 Refrigerant recovery and repurposing Mechanical Engineering; Lighting; Heating 2 Active
US10400149B2 Improving glide in refrigerant blends and/or azeotopic blends, alternatives to R123 refrigerant, and refrigerant compositions, methods, and systems thereof Chemistry; Metallurgy 2 Active
US11118822B2 Refrigerant leak detection by use of fluid additive Mechanical Engineering; Lighting; Heating 2 Active
US9868888B2 Refrigerant compositions Chemistry; Metallurgy 2 Active
US10443900B2 Heat pump Mechanical Engineering; Lighting; Heating 2 Active
US10208234B2 Refrigerant additives and compositions Chemistry; Metallurgy 2 Active
US10886739B2 Systems and methods for grid appliances Emerging Cross-Sectional Technologies 1 Active
US11162722B2 Retrofitting R410A HVAC products to handle flammable refrigerants Emerging Cross-Sectional Technologies 1 Active
US10190808B2 Refrigeration system with purge and acid filter Emerging Cross-Sectional Technologies 1 Active
US11073315B2 Refrigeration system with purge and acid filter Emerging Cross-Sectional Technologies 1 Active
US11703240B2 Retrofitting R410A HVAC products to handle flammable refrigerants Emerging Cross-Sectional Technologies 0 Active
US12387281B2 Systems and methods for grid appliances Emerging Cross-Sectional Technologies 0 Active
US11008493B2 Low global warming potential refrigerants in liquid chillers Mechanical Engineering; Lighting; Heating 0 Active

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.