Patents by Inventor Al F. Kerst

Al F. Kerst 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).

  • Substituted ethane diphosphonic acids and salts and esters thereof
    Patent number: 3962318
    Abstract: New and useful substituted ethane diphosphonic acids and salts and esters thereof as exemplified by the ester compound having the formula ##EQU1## tetraethyl, 1,2 dihydroxy ethane-1,1-diphosphonate and processes for preparing the same which generically comprise the "de-oxiranization" of an epoxy ethane diphosphonate having the formula ##EQU2## wherein R.sub.3 is hydrogen, a metal ion, or an organic radical.
    Type: Grant
    Filed: March 21, 1975
    Date of Patent: June 8, 1976
    Assignee: Monsanto Company
    Inventor: Al F. Kerst
  • Substituted ethane diphosphonic acids and salts and esters thereof
    Patent number: 3957858
    Abstract: New and useful substituted ethane diphosphonic acids and salts thereof as exemplified by the acid compound having the formula ##EQU1## 2-thiomethyl-1-hydroxy-ethane-1,1-diphosphonic acid and processes for preparing the same which generically comprise the "de-oxiranization" of an epoxy ethane diphosphonate having the formula ##EQU2## wherein R.sub.3 is hydrogen, a metal ion, or an organic radical.
    Type: Grant
    Filed: August 23, 1972
    Date of Patent: May 18, 1976
    Assignee: Monsanto Company
    Inventor: Al F. Kerst
  • Substituted ethane diphosphonic acids and salts
    Patent number: 3944599
    Abstract: New and useful substituted ethane diphosphonic acids and salts and esters thereof as exemplified by the ester compound having the formula ##EQU1## tetraethyl, 1,2 dihydroxy ethane-1,1-diphosphonate and processes for preparing the same which generically comprise the "de-oxiranization" of an epoxy ethane diphosphonate having the formula ##EQU2## wherein R.sub.3 is hydrogen, a metal ion, or an organic radical.
    Type: Grant
    Filed: December 6, 1973
    Date of Patent: March 16, 1976
    Assignee: Monsanto Company
    Inventor: Al F. Kerst
  • Substituted ethane diphosphonic acids and salts and esters thereof
    Patent number: 3940436
    Abstract: New and useful substituted ethane diphosphonic acids and salts thereof as exemplified by the compound having the formula ##EQU1## 2-amino-1-hydroxyethane-1,1-diphosphonic acid and processes for preparing the same which generically comprise the "de-oxiranization" of an epoxy ethane diphosphonate having the formula ##EQU2## wherein R.sub.3 is hydrogen, a metal ion, or an organic radical.
    Type: Grant
    Filed: August 23, 1972
    Date of Patent: February 24, 1976
    Assignee: Monsanto Company
    Inventor: Al F. Kerst