Patents Assigned to Dr. Werner Freyberg
  • Patent number: 4597218
    Abstract: The invention relates to a sachet for pest control, composed at least in part of a gas- and water vapor-permeable substantially anhydrous non-woven fabric, said fabric being a plural component non-woven fabric comprising at least one material-forming fibers and having a melting or softening temperature above 165.degree. C. and a second material having thermoplastic properties ad a melting or softening temperature below 145.degree. C. The invention also relates to the use of the sachets for accommodating gas releasing pest control agents, in particular a composition based on alkaline earth and/or earth metal phosphides releasing phosphine gas.
    Type: Grant
    Filed: July 16, 1984
    Date of Patent: July 1, 1986
    Assignee: Dr. Werner Freyberg
    Inventors: Wolfgang Friemel, Reiner Ehret
  • Patent number: 4180557
    Abstract: Method for detoxifying phosphide containing pesticides by treatment with aqueous alkaline reagents optionally containing oxidants and/or surfactants.
    Type: Grant
    Filed: October 19, 1977
    Date of Patent: December 25, 1979
    Assignee: Dr. Werner Freyberg
    Inventors: Werner Praxl, Reiner Ehret