Patents Represented by Attorney Lawrence S. Dope

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  • Leather tanning with oligourethanes
    Patent number: 4106898
    Abstract: This invention is concerned with a method of tanning or retanning leather or pelts by treating them with an aqueous liquor containing hydrophilic oligourethanes. The oligourethanes have a molecular weight of from 300 to 20,000 and they may be methylolated. The oligourethanes may be water soluble owing to their hydrophilic segments. The liquor may also contain up to an equal amount of formaldehyde or compounds which split off formaldehyde.
    Type: Grant
    Filed: August 30, 1976
    Date of Patent: August 15, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harro Traubel, Helmut Reiff, Dieter Dieterich