Patents Represented by Attorney James M. Arnold, White & Durkee Warner

Find this attorney in the Justia Lawyer Directory

  • Carbon dioxide assisted hydrolysis of aminophosphonates
    Patent number: 6040476
    Abstract: The invention provides a process for preparing aminophosphonic acids comprising contacting an aminophosphonate ester with a base in the presence of a hydrolysis facilitator selected from the group consisting of CO.sub.2, CS.sub.2 and COS. In one embodiment, the aminophosphonate ester is first prepared by contacting an amine, trialkylphosphite, base and formaldehyde.
    Type: Grant
    Filed: October 15, 1998
    Date of Patent: March 21, 2000
    Assignee: Monsanto Company
    Inventors: Todd J. Johnson, William H. Miller
  • Method for preparing cyanophosphonate derivatives from phosphate esters and cyanide
    Patent number: 5861525
    Abstract: A process for preparing cyanophosphonate derivatives involves contacting a phosphate ester and cyanide in a reaction mixture under conditions sufficient to produce a cyanophosphonate derivative. That cyanophosphonate derivative product can subsequently be hydrogenated to produce an aminomethylphosphonate derivative.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: January 19, 1999
    Assignee: Monsanto Company
    Inventors: Patrick J. Lennon, Sergey G. Vulfson
  • Method for preparing cyanophosphonate derivatives from pyrophosphate or polyphosphate esters and cyanide
    Patent number: 5859278
    Abstract: A process for preparing cyanophosphonate derivatives involves contacting a pyrophosphate ester or a polyphosphate ester and cyanide in a reaction mixture under conditions sufficient to produce the cyanophosphonate derivative. The cyanophosphonate derivative product can subsequently be hydrogenated to produce an aminomethylphosphonate derivative.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: January 12, 1999
    Assignee: Monsanto Company
    Inventors: Patrick J. Lennon, Sergey G. Vulfson
  • Method for preparing cyanophosphonate derivatives from phosphoric anhydride and cyanide
    Patent number: 5858317
    Abstract: A process for preparing cyanophosphonate derivatives involves contacting phosphoric anhydride (P.sub.4 O.sub.10) and a cyanide, preferably in the presence of a Lewis base, in a reaction mixture under sufficient conditions to produce a cyanophosphonate derivative. The cyanophosphonate derivative can be subsequently hydrogenated to produce an aminomethylphosphonate derivative.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: January 12, 1999
    Assignee: Monsanto Company
    Inventors: Patrick J. Lennon, Sergey G. Vulfson
  • Hydrogenation of cyanophosphonate derivatives in the presence of a glycine derivative
    Patent number: 5859290
    Abstract: A process for preparing N-phosphonomethylglycine or an N-phosphonomethylglycine derivative involves the hydrogenation of cyanophosphonate derivatives in the presence of a glycine derivative and a catalyst to produce N-phosphonomethylglycine.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: January 12, 1999
    Assignee: Monsanto Company
    Inventor: Patrick J. Lennon
  • Process to prepare amino carboxylic acid salts
    Patent number: 5739390
    Abstract: An improved process is discloses to prepare an amino carboxylic acid salt. According to the process an aqueous solution of an amino alcohol is contacted with an alkali metal hydroxide in the presence of an effective amount of Raney copper catalyst that has from about 10 parts per million of an element selected from the group consisting of bismuth, tin, antimony, lead, germanium and mixtures thereof.
    Type: Grant
    Filed: January 16, 1996
    Date of Patent: April 14, 1998
    Assignee: Monsanto Company
    Inventors: Thaddeus Stephen Franczyk, Yukio Kadono, Norikazu Miyagawa, Seiji Takasaki, Hiroki Wakayama