Patents by Inventor Hans-Dieter Allardt

Hans-Dieter Allardt 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).

  • Hairdyeing composition and method
    Patent number: 4466805
    Abstract: Compounds of the formulaR--C(R.sup.2).dbd.C(R.sup.3)--C(R.sup.4).dbd.C(R.sup.5)--Rwherein R is --CHO, --CH(OR.sup.6).sub.2, 1,3-dioxolan-2-yl, 4-methyl-1,3-dioxolan-2-yl or 1,3-dioxan-2-yl; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently are hydrogen, methyl or ethyl; and R.sup.6 is C.sub.1-8 alkyl are highly useful as cosmetic active ingredients, e.g., as hair dyes and skin tanning agents. Compositions of these compounds with other active ingredients such as dihydroxyacetone are also quite effective.
    Type: Grant
    Filed: August 20, 1980
    Date of Patent: August 21, 1984
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Reiner Walters, Gernot Moschl, Hans-Dieter Allardt