Werner Heel and Karl Zeile, US2997469 (1961 to Ingelheim, Germany, assignors to C. H. Boehringer Sohn, Ingelheim, Germany, a partnership).
 , GB862198 (1961 to ILSE LIEBRECHT, JULIUS LIEBRECHT, WALTER MAYER LIST, WALTER MAYER-LIST).

  , GB791416 (1958 to ILSE LIEBRECHT, JULIUS LIEBRECHT, WALTER MAYER LIST. WALTER MAYER-LIST).
Own work
Nuklear