Description | Is enclosing copy of patent specification No.877,120 and copy of their statement of opposition - need to produce evidence in support of their statements and would be glad if Florey or his colleagues could help - can supply evidence that Distillers' chemists had listed for attempted preparation penicillins with substituted phenoxymethyl side chains - notes publications showing use of di substituted acetic acids in penicillin fermentations - at 25 May 1959, priority date of patent, was obvious what likely compounds could be made and tested - discusses this. |