judgment - 1. This is a suit for infringement of patent under Section 29 of the Indian patents and Designs Act, 1911, filed by the plaintiffs who are the legal owners and proprietors of Indian Patent No. 58716 in respect of the manufacture of new sulphonyl-ureas, salts of those compounds and of anti-diabetic preparation containing such compounds. The application for the said patent was made by the plaintiffs on 23rd October 1956 and was accepted on 7th November 1957, but the same took effect from the 8th of May 1956 by reason of the provisions of Section 78A of the Patents and Designs Act. One of the chemical compounds comprised in the said patent is Tolbutamide, and since 1957 the plaintiffs have been marketing the same as an anti-diabetic drug in India and all over the world under the trade mark ""Rastinon"". The suit was originally filed only against the present first defendants who, according to the Plaintiffs, have since May 1961 wrongfully and with full knowledge of the plaintiffs said patent No. 58716 infringed the said patent by manufacturing, preparing and selling Uni-Tolbid tablets or Tolbutamide manufactured in accordance with and by the use of the invention disclosed in

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