Patents by Inventor Håkan Rahkola

Håkan Rahkola has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Polyol and complex esters for use with, in particular, fluorinated refrigerants
    Patent number: 6436309
    Abstract: The invention concerns a refrigerant composition which comprises a chlorine-free hydrofluorocarbon based refrigerant and, mixed with the refrigerant, a lubricant comprising a polyol ester. According to the invention the polyol ester comprises an ester of 2-butyl-2-ethyl-1,3-propane diol, the carboxylic acid residue of which is derived from a linear or branched C4 . . . C8-carboxylic acid or an anhydride thereof, or it is derived from a mixture of linear or branched C4 . . . C18-carboxylic acids or anhydrides thereof. The present invention also concerns novel complex esters of 2-butyl-2-ethyl-1,3-propanediol, which contain residues of mono- or bivalent carboxylic acids. The novel esters exhibit good solubility in fluorinated hydrocarbons and excellent lubricating properties.
    Type: Grant
    Filed: January 10, 2000
    Date of Patent: August 20, 2002
    Assignee: Fortum Oil and Gas Oy
    Inventors: Kjell Ankner, Håkan Rahkola, Jari Koistinen, Essi Glad, Virpi Saranp{umlaut over (aa)}