Patents by Inventor Walter Lange

Walter Lange 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).

  • (2-Oxo-pyrrolidines)-acetic hydrazides
    Patent number: 4123548
    Abstract: The present invention pertains to novel (2-oxo-pyrrolidine-1)-acetic hydrazides, methods for preparation and subsequent treatment therewith, and pharmaceutical preparations containing the same.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: October 31, 1978
    Assignee: Chemisches Laboratorium Fritz-Walter Lange GmbH & Co KG
    Inventors: Fritz-Walter Lange, Haireddin Jacobi, Jens Muller
  • (2-Oxo-pyrrolidines)-acetic hydrazides
    Patent number: 4069336
    Abstract: The present invention pertains to novel (2-oxo-pyrrolidine-1)-acetic hydrazides, methods for preparation and subsequent treatment therewith, and pharmaceutical preparations containing the same.
    Type: Grant
    Filed: February 25, 1976
    Date of Patent: January 17, 1978
    Assignee: Chemisches Laboratorium Fritz-Walter Lange GmbH & Co KG
    Inventors: Fritz-Walter Lange, Haireddin Jacobi, Jens Muller
  • 1,3-Bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine-na phthalene-1,5-disulphonate
    Patent number: 4048169
    Abstract: The process provided for the production of high-purity 1,3-bis-(.beta.-ethexyl)-5-amino-5-methyl-hexahydropyrimidine, also known as hexetidin, by reacting 1,3-bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine with naphthalene-1,5-disulphonic acid in a solvent to selectively precipitate the novel intermediate compound 1,3-bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine-naphthale ne-1,5-disulphonate, which is separated off, treated with aqueous alkali to produce 1,3-bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine, and subsequently hydrogenated to produce high-purity hexetidin.
    Type: Grant
    Filed: November 8, 1976
    Date of Patent: September 13, 1977
    Assignee: MEDITEST Institut fur medizinisch pharmazeutische Untersuchungen GmbH
    Inventors: Fritz-Walter Lange, Gert Haffner, Jens Muller
  • Process for the manufacture of 1,3-bis-(.beta.-ethylhexyl)-5-amino-5-methyl-hexahydropyrimidine
    Patent number: 4010160
    Abstract: The process provided for the production of high-purity 1,3-bis-(.beta.-ethexyl)-5-amino-5-methyl-hexahydropyrimidine, also known as hexetidin, by reacting 1,3-bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine with naphthalene-1,5-disulphonic acid in a solvent to selectively preciptitate the novel intermediate compound 1,3-bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine-naphthale ne-1,5-disulphonate, which is separated off, treated with aqueous alkali to produce 1,3-bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine, and subsequently hydrogenated to produce high-purity hexetidin.The invention relates to an industrially practicable process for the manufacture of high-purity 1,3-bis(.beta.-ethylhexyl)-5-amino-5-methyl-hexahydropyrimidine of the formula ##STR1## which is also known by the name of hexetidin and in view of its antimicrobial activity is used as an antiseptic and insecticide.From M.
    Type: Grant
    Filed: January 27, 1975
    Date of Patent: March 1, 1977
    Assignee: Meditest Institut fur Medizinisch Pharmazeutische Untersuchungen GmbH
    Inventors: Fritz-Walter Lange, Gert Haffner, Jens Muller