I believe it to be ground we have covered previously, but it appears Couchman was the fella who drug infringing folks into court:

http://books.google.com/books?id=OIIzAAAAIAAJ&pg=PA58&dq=anson+%26+deeley+patent+infringement&hl=en&sa=X&ei=mLpHUcL7CrPC4AOyyYGgAw&ved=0CEYQ6AEwAg#v=onepage&q=anson&f=false
copy & paste

Kind Regards,

Raimey
rse