Patents Act 1977

71 Declaration or declarator as to non-infringement

(1) Without prejudice to the court's jurisdiction to make a declaration or declarator apart from this section, a declaration or declarator that an act does not, or a proposed act would not, constitute an infringement of a patent may be made by the court or the comptroller in proceedings between the person doing or proposing to do the act and the proprietor of the patent, notwithstanding that no assertion to the contrary has been made by the proprietor, if it is shown—

(a) that that person has applied in writing to the proprietor for a written acknowledgment to the effect of the declaration or declarator claimed, and has furnished him with full particulars in writing of the act in question ; and

(b) that the proprietor has refused or failed to give any such acknowledgment.

(2) Subject to section 72(5) below, a declaration made by the comptroller under this section shall have the same effect as a declaration or declarator by the court.