Patents by Inventor Michel A. O. Ledent

Michel A. O. Ledent 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).

  • Hexamethlene phosphonate concentrate
    Patent number: 5606106
    Abstract: Concentrated aqueous hexamethylene phonic acid solutions are described containing, in addition to high levels e.g. 40%-50% of phosphonic acid a narrowly defined level of non-oxidizing mineral acid, preferrably hydrochloric acid.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: February 25, 1997
    Assignee: Monsanto Europe S.A.
    Inventor: Michel A. O. Ledent
  • Aminomethylenephosphonic acid solutions
    Patent number: 4728460
    Abstract: Aqueous solutions of aminomethylenephosphonic acid selected from diethylenetriaminepenta(methylenephosphonic acid), diethylenetriaminetetra(methylenephosphonic acid), diethylenetriaminetri(methylenephosphonic acid) and mixtures thereof are stabilized against crystallization of said aminomethylenephosphonic acid by including non-oxidizing mineral acid in such solutions in an amount stoichiometrically equivalent to at least 10% hydrochloric acid by weight of the solution.
    Type: Grant
    Filed: April 24, 1986
    Date of Patent: March 1, 1988
    Assignee: Monsanto Company
    Inventors: Michel A. O. Ledent, Bronislav H. May
  • Aminomethylenephosphonic acid solutions
    Patent number: 4615840
    Abstract: Aqueous solutions of aminomethylenephosphonic acid selected from diethylenetriaminepenta(methylenephosphonic acid), diethylenetriaminetetra(methylenephosphonic acid), diethylenetriaminetri(methylenephosphonic acid) and mixtures thereof are stabilized against crystallization of said aminomethylenephosphonic acid by including non-oxidizing mineral acid in such solutions in an amount stoichiometrically equivalent to at least 10% hydrochloric acid by weight of the solution.
    Type: Grant
    Filed: October 11, 1984
    Date of Patent: October 7, 1986
    Assignee: Monsanto Europe S.A.
    Inventors: Michel A. O. Ledent, Bronislav H. May
  • Aminomethylenephosphonic acid solutions
    Patent number: 4477390
    Abstract: Aqueous solutions of aminomethylenephosphonic acid selected from diethylenetriaminepenta(methylenephosphonic acid). diethylenetriaminetetra(methylenephosphonic acid), diethylenetriaminetri(methylenephosphonic acid) and mixtures thereof are stabilized against crystallization of said aminomethylenephosphonic acid by including non-oxidizing mineral acid in such solutions in an amount stoichiometrically equivalent to at least 10% hydrochloric acid by weight of the solution.
    Type: Grant
    Filed: August 21, 1981
    Date of Patent: October 16, 1984
    Assignee: Monsanto Company
    Inventors: Michel A. O. Ledent, Bronislav H. May