Patents by Inventor Hans Geffers

Hans Geffers 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).

  • Process for preventing corrosion and the formation of scale in water circulating system
    Patent number: 4057511
    Abstract: Preventing corrosion and scale formation in water re-circulating systems by adding to the water to be circulated from about 5 to 100 g/m.sup.3, based on the weight of the water to be circulated, of a compound selected from the group consisting of those of the formula ##STR1## and the water-soluble salts thereof and then circulating said water in said system, R being hydrogen, alkyl, alkenyl or alkinyl having up to 4 carbon atoms; phenyl; cycloalkyl having 3 to 6 carbon atoms; benzyl; phenethyl or ##STR2## wherein R' is hydrogen, alkyl having 1 to 4 carbon atoms or carboxyl, R" is hydrogen or methyl and R'" is carboxyl.
    Type: Grant
    Filed: November 6, 1975
    Date of Patent: November 8, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Bohnsack, Hans Geffers, Herbert Kallfass, Walter Radt
  • .alpha.-Alkyl-phosphonosuccinic acid compounds and sequestering compositions containing them
    Patent number: 4020101
    Abstract: Certain novel .alpha.-alkyl-phosphonosuccinic acid compounds of the formula ##STR1## in which R is lower alkyl, or alkenyl or alkynyl, cycloalkyl, or aralkyl are particularly suitable as sequestering agents, e.g., for incorporation into cleansing compositions.
    Type: Grant
    Filed: January 20, 1975
    Date of Patent: April 26, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans Geffers, Walter Radt, Reinhard Schliebs, Hartmut Schulz
  • Process for preventing corrosion and the formation of scale in water circulating system
    Patent number: 3933427
    Abstract: Preventing corrosion and scale formation in water re-circulating systems by adding to each cubic meter of the water being re-circulated from about 5 to 100 grams of a compound selected from the group consisting of those of the formula ##EQU1## and the water-soluble salts thereof R being hydrogen, alkyl, alkenyl or alkinyl having up to 4 carbon atoms; phenyl; cycloalkyl having 3 to 6 carbon atoms; benzyl; phenethyl or ##EQU2## wherein R' is hydrogen, alkyl having 1 to 4 carbon atoms or carboxyl, R" is hydrogen or methyl and R'" is carboxyl.
    Type: Grant
    Filed: May 21, 1973
    Date of Patent: January 20, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Bohnsack, Hans Geffers, Herbert Kallfass, Walter Radt