Patents by Inventor John Leonard Ohlson

John Leonard Ohlson 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).

  • N,N-di-(hydroxybenzyl)-trimethylene diaminediacetic acids
    Patent number: 4069249
    Abstract: A novel chelating agent having the formula ##STR1## in whichA. EACH OF X.sub.1, X.sub.2, X.sub.3, and X.sub.4 is a member selected from the group consisting of (i) hydrogen; (ii) an alkyl group having 1-4 carbon atoms; (iii) --CN; (iv) --So.sub.3 M.sub.1 ; (v) --COOM.sub.1 ; (vi) --OM.sub.3 ; (vii) --NO.sub.2 ; (viii) --OH; and (ix) ##STR2## in which each of R.sub.1 and R.sub.2 is an alkyl group having 1-4 carbon atoms;B. each of M.sub.1, M.sub.2, M.sub.3, and M.sub.4 is a member selected from the group consisting of (i) a hydrogen ion; (ii) an alkali metal ion; (iii) one-half an alkaline earth metal ion; and (vi) an ammonium ion having the formula ##STR3## in which each of R.sub.3, R.sub.4, R.sub.5, and R.sub.6 is a member selected from the group consisting of (A) hydrogen; (B) an alkyl group having 1-4 carbon atoms; and (C) a hydroxyalkyl group having 1-4 carbon atoms; andC. Z is a member selected from the group consisting of (i) hydrogen; and (ii) hydroxyl.
    Type: Grant
    Filed: November 11, 1975
    Date of Patent: January 17, 1978
    Assignee: W. R. Grace & Co.
    Inventors: Roger Robert Gaudette, John Leonard Ohlson, Patricia Marie Scanlon
  • Hexahydropyrimidine-1,3-diacetonitriles and processes for preparing the same
    Patent number: 4059548
    Abstract: N,N'-Dicarboxymethyl-1,3-propanediamine (designated PDDA) is prepared by reacting 1,3-propanediamine with formaldehyde and HCN to form hexahydropyrimidine-1,3-diacetonitrile, which is hydrolyzed with an aqueous alkali metal hydroxide to form dialkali metal hexahydropyrimidine-1,3-diacetate which, in turn, is reacted with mineral acid to form the desired PDDA and formaldehyde.N,n'-dicarboxymethyl-2-hydroxy-1,3-propanediamine (designated HYDROXY-PDDA) is prepared by reacting 1,3-diamino-2-propanol with formaldehyde and HCN to form 5-hydroxyhexahydropyrimidine-1,3-diacetonitrile, which is hydrolyzed with an aqueous alkali metal hydroxide to form dialkali metal 5-hydroxyhexahydropyrimidine-1,3-diacetate which, in turn, is reacted with acid to form the desired HYDROXY-PDDA and formaldehyde.
    Type: Grant
    Filed: July 7, 1976
    Date of Patent: November 22, 1977
    Assignee: W. R. Grace & Co.
    Inventors: Roger Robert Gaudette, John Leonard Ohlson, Patricia Marie Scanlon
  • Preparation of N,N'-Dicarboxymethyl-1,3-propanediamines
    Patent number: 4058527
    Abstract: N,N'-Dicarboxymethyl-1,3-propanediamine (designated PDDA) is prepared by reacting 1,3-propanediamine with formaldehyde and HCN to form hexahydropyrimidine-1,3-diacetonitrile, which is hydrolyzed with an aqueous alkali metal hydroxide to form dialkali metal hexahydropyrimidine-1,3-diacetate which, in turn, is reacted with mineral acid to form the desired PDDA and formaldehyde.N,n'-dicarboxymethyl-2-hydroxy-1,3-propanediamine (designated HYDROXY-PDDA) is prepared by reacting 1,3-diamino-2-propanol with formaldehyde and HCN to form 5-hydroxyhexahydropyrimidine-1,3-diacetonitrile, which is hydrolyzed with an aqueous alkali metal hydroxide to form dialkali metal 5-hydroxyhexahydropyrimidine-1,3-diacetate which, in turn, is reacted with acid to form the desired HYDROXY-PDDA and formaldehyde.
    Type: Grant
    Filed: July 7, 1976
    Date of Patent: November 15, 1977
    Assignee: W. R. Grace & Co.
    Inventors: Roger Robert Gaudette, John Leonard Ohlson, Patricia Marie Scanlon
  • 5-Hydroxyhexahydropyrimidine
    Patent number: 4058528
    Abstract: N,N'-Dicarboxymethyl-1,3-propanediamine (designated PDDA) is prepared by reacting 1,3-propanediamine with formaldehyde and HCN to form hexahydropyrimidine-1,3-diacetonitrile, which is hydrolyzed with an aqueous alkali metal hydroxide to form dialkali metal hexahydropyrimidine-1,3-diacetate which, in turn, is reacted with mineral acid to form the desired PDDA and formaldehyde.N,n'-dicarboxymethyl-2-hydroxy-1,3-propanediamine (designated HYDROXY-PDDA) is prepared by reacting 1,3-diamino-2-propanol with formaldehyde and HCN to form 5-hydroxyhexahydropyrimidine-1,3-diacetonitrile, which is hydrolyzed with an aqueous alkali metal hydroxide to form dialkali metal 5-hydroxyhexahydropyrimidine-1,3-diacetate which, in turn, is reacted with acid to form the desired HYDROXY-PDDA and formaldehyde.
    Type: Grant
    Filed: July 7, 1976
    Date of Patent: November 15, 1977
    Assignee: W. R. Grace & Co.
    Inventors: Roger Robert Gaudette, John Leonard Ohlson, Patricia Marie Scanlon
  • Preparation of N,N'-dicarboxymethyl-1,3-propanediamines
    Patent number: 3988367
    Abstract: N,N'-Dicarboxymethyl-1,3-propanediamine (designated PDDA) is prepared by reacting 1,3-propanediamine with formaldehyde and HCN to form hexahydropyrimidine-1,3-diacetonitrile, which is hydrolyzed with an aqueous alkali metal hydroxide to form dialkali metal hexahydropyrimidine-1,3-diacetate which, in turn, is reacted with mineral acid to form the desired PDDA and formaldehyde.N,n'-dicarboxymethyl-2-hydroxy-1,3-propanediamine (designated HYDROXY-PDDA) is prepared by reacting 1,3-diamino-2-propanol with formaldehyde and HCN to form 5-hydroxyhexahydropyrimidine-1,3-diacetonitrile, which is hydrolyzed with an aqueous alkali metal hydroxide to form dialkali metal 5-hydroxyhexahydropyrimidine-1,3-diacetate which, in turn, is reacted with acid to form the desired HYDROXY-PDDA and formaldehyde.
    Type: Grant
    Filed: November 11, 1975
    Date of Patent: October 26, 1976
    Assignee: W. R. Grace & Co.
    Inventors: Roger Robert Gaudette, John Leonard Ohlson, Patricia Marie Scanlon