http://www.legislation.gov.uk/ukpga/Geo6/12-13-14/87/section/4345./1991-02-01Patents Act 1949An Act to consolidate certain enactments relating to patents.1979-04-30texttext/xmlenStatute Law Database2011-05-261991-02-01 Voluntary endorsement of patent43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F1