Patents by Inventor Pertti Rimpi

Pertti Rimpi 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).

  • Process for cooking and bleaching pulp
    Patent number: 4799994
    Abstract: A process for cooking and bleaching pulp in a closed system, wherein spent liquors from the cooking and the bleaching are recovered and their chemicals are regenerated and recycled as cooking and bleaching chemicals.
    Type: Grant
    Filed: April 28, 1986
    Date of Patent: January 24, 1989
    Assignee: Oy Tampella AB
    Inventor: Pertti Rimpi
  • Method for recovering sodium chemicals from green liquor and flue gases
    Patent number: 4470957
    Abstract: The invention relates to a method for recovering sodium chemicals from green liquor by precarbonating green liquor by means of flue gases, by bringing a precarbonated solution into contact with a sodium bicarbonate solution and by stripping hydrogen sulphide from the so obtained reaction mixture by means of steam, for producing hydrogen sulphide gas and a sodium carbonate solution, which sodium carbonate solution is so pure, in relation to sodium sulphide that it can directly be led into the washing of the flue gases and into a carbonation stage, for producing the sodium bicarbonate solution.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: September 11, 1984
    Assignee: Oy Tampella Ab
    Inventor: Pertti Rimpi