The Law Reports (Privy Council Appeals)
LR 2 PC 1
[JUDICIAL COMMITTEE]
In re
MCDOUGAL'S PATENT.
1867 Dec. 4,
5.
SIR WILLIAM ERLE, SIR JAMES WILLIAM COLVILE, SIR EDWARD VAUGHAN WILLIAMS, and SIR RICHARD TORIN KINDERSLEY.
Letters Patent
— Subject matter known chemical substances in combination, in common use before and after grant
— Validity of
— Prolongation of term, conditions necessary to establish.