Patents by Inventor Christopher M. Tusa

Christopher M. Tusa 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).

  • Method for preparing O,O-dialkyl S-[2-(alkylthio)alkyl] phosphorodithioates
    Patent number: 7049456
    Abstract: The invention relates to a method of preparing O,O-dialkyl S-[2-(alkylthio)alkyl] phosphorodithioates by treating O,O-dialkyl dithiophosphoric acids with a base in the substantial absence of organic solvent to obtain O,O-dialkyl dithiophosphoric acid salts that are in turn treated with thioalcohol derivatives to form the O,O-dialkyl S-[2-(alkylthio)alkyl] phosphorodithioates.
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: May 23, 2006
    Assignee: Bayer Cropscience LP
    Inventors: Vidyanatha A. Prasad, Robert D. Ingalls, Stephen C. Slahck, Christopher M. Tusa
  • Method for preparing O,O-dialkyl S-[2-(alkylthio)alkyl] phosphorodithioates
    Publication number: 20040176629
    Abstract: The invention relates to a method of preparing O,O-dialkyl S-[2-(alkylthio)alkyl]phosphorodithioates by treating -O,O-dialkyl dithiophosphoric acids with a base in the substantial absence of organic solvent to obtain O,O-dialkyl dithiophosphoric acid salts that are in turn treated with thioalcohol derivatives to form the O,O-dialkyl S-[2-(alkylthio)alkyl]phosphorodithioates.
    Type: Application
    Filed: March 7, 2003
    Publication date: September 9, 2004
    Inventors: Vidyanatha A. Prasad, Robert D. Ingalls, Stephen C. Slahck, Christopher M. Tusa
  • Methods for purifying O,O-dialkyl S-[2-(alkylthio)alkyl] phosphorodithioates
    Publication number: 20040167348
    Abstract: The invention relates to a method of purifying an O,O-dialkyl S-[2-(alkylthio)alkyl] phosphorodithioate by purging a sample containing a volatile and the O,O-dialkyl S-[2-(alkylthio)alkyl] phosphorodithioate with a gas.
    Type: Application
    Filed: February 26, 2003
    Publication date: August 26, 2004
    Inventors: Vidyanatha A. Prasad, Robert D. Ingalls, Stephen C. Slahck, Christopher M. Tusa, Paul E. Nagy, Michael P. Newcomer, Donald K. Smith
  • Process for producing dimethyl (2,2,2-trichloro-1-hydroxyethyl)-phosphonate and granular formulations thereof
    Patent number: 5922404
    Abstract: The present invention relates to an integrated process for synthesizing dimethyl (2,2,2-trichloro-1-hydroxyethyl)-phosphonate and a process for impregnating the dimethyl (2,2,2-trichloro-1-hydroxyethyl)-phosphonate on to inert carrier granules. The process involves adding dimethyl phosphite to a reaction mixture containing chloral under anhydrous, inert conditions. The molar ratio of chloral to dimethyl phosphite used in the reaction mixture is from about 1.0:1.0 to about 1.1:1.0. The impregnation process involves transferring molten dimethyl (2,2,2-trichloro-1-hydroxyethyl)-phosphonate into a process vessel and discharging weighed aliquots into a formulation vessel to form a granular product containing dimethyl (2,2,2-trichloro-1-hydroxyethyl)-phosphonate.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: July 13, 1999
    Assignee: Bayer Corporation
    Inventors: Vidyanatha A. Prasad, Klaus Jelich, Christopher M. Tusa, Daniel E. Terry, Stephen C. Slahck, Scott P. Hensley
  • Method for reducing deflagration of azinphos-methyl
    Patent number: 5268177
    Abstract: A carbonate of an alkali metal is added to an azinphos-methyl powder formulation in an amount such that the carbonate is at least 10% by weight of the total mixture. Sodium bicarbonate is the preferred carbonate. The resultant mixtures are characterized by a reduced tendency toward deflagration at temperatures below 200.degree. C.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: December 7, 1993
    Assignee: Miles Inc.
    Inventors: Horace G. Barnett, Jr., Christopher M. Tusa