Here is a link with the full text of the Treaty of Versailles. Check it out, very interesting, there are some REALLY OBSCURE provisions in there.
I have obviously read a few references to the Germans surrendering aspirin, I have yet to find a direct reference to it in the Treaty itself:
I DID find:
"Notwithstanding the provisions of Article 297, where immediately before the
outbreak of war a company incorporated in an Allied or Associated State had
rights in common with a company controlled by it and incorporated in Germany to
the use of trademarks in third countries, or enjoyed the use in common with such
company of unique means of reproduction of goods or articles for sale in third
countries, the former company shall alone have the right to use these trade-marks
in third countries to the exclusion of the German company, and these unique means
of reproduction shall be handed over to the former company, notwithstanding any
action taken under German war legislation with regard to the latter company or
its business, industrial property or shares. Nevertheless, the former company, if
requested, shall deliver the latter company derivative copies permitting the
continuation of reproduction of articles for use within German territory."
I am reading this to mean that Bayer Germany forfeits its trademark to its successor, not that the trademark itself is unenforceable, nevertheless, peruse it, maybe it IS in there, it really is a LONG treaty...
I love this clause:
"Within the same period Germany will hand over to His Britannic Majesty's
Government the skull of the Sultan Mkwawa which was removed from the Protectorate
of German East Africa and taken to Germany."