Patents by Inventor Guglielmo Ruffini

Guglielmo Ruffini 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).

  • Ketene dimer paper sizing agents modified by nonreactive hydrophobes
    Patent number: 5190584
    Abstract: Compositions of ketene dimer and nonreactive hydrophobe compound and method for internally sizing paper therewith are provided, wherein the melting point of said hydrophobe compound is higher than the melting point of the ketene dimer.
    Type: Grant
    Filed: December 13, 1990
    Date of Patent: March 2, 1993
    Assignee: Hercules Incorporated
    Inventor: Guglielmo Ruffini
  • Preparation of paper pulps from dicotyledonous plants
    Patent number: 4106979
    Abstract: Paper pulp is prepared from dicotyledonous plants by stirring said plants in an alkaline solution in the presence of a surfactant and stain inhibiting agent to obtain a stock containing a woody core fraction and a bark fraction containing bast fibers, separating said fractions and then cooking and bleaching the bark fraction in an alkaline solution containing an oxidizing agent and an alkyl sulfate surfactant.
    Type: Grant
    Filed: March 21, 1977
    Date of Patent: August 15, 1978
    Assignee: Consorzio Fabocart S.p.A.
    Inventors: Guglielmo Ruffini, Erio Pezzotti
  • Treatment of wood chips with an alkali metal borohydride solution followed by mechanical defibration
    Patent number: 3981765
    Abstract: A chemi-mechanical process for producing unbleached pulp with improved yields at high brightness including impregnating a lignocellulosic material in the form of wood chips with an alkaline solution containing an alkali metal borohydride in an amount over 0.1% by weight at a pH greater than 13, heating the impregnated chips at a temperature less than 150.degree. C to provide semi-cooked chips having a brightness in excess of 60 GE, and then defiberizing the semi-cooked chips to mechanically separate the fibers into an unbleached pulp having said brightness and a yield of at least 85%.
    Type: Grant
    Filed: December 17, 1974
    Date of Patent: September 21, 1976
    Assignee: Vita Mayer & C.
    Inventors: Emilio Kruger, Guglielmo Ruffini, Giovanni Gandini, Franco Ghislandi