Yes, he did that too. He did the patent busting with the help of the “Promise Doctrine” which is no longer in existence. The Supreme Court abolished it last summer. Huge loss for BS and Apotex, IMO and more protection for innovators who shoulder the R&D expenses.AFAIK BS was known for patent busting. Once he had the formulas, he made less potent versions of the same drug. IMO
https://www.pharmainbrief.com/2017/...y-in-landmark-supreme-court-of-canada-ruling/
http://www.thecourt.ca/astrazeneca-canada-inc-v-apotex-inc-supreme-court-overturns-promise-doctrine/The “Promise Doctrine” has been conclusively rejected by Canada’s highest court as a basis for invalidating a Canadian patent. In a judgment that reverses years of jurisprudence in the lower courts, the Supreme Court of Canada today held that the level of utility required of a Canadian patent must not be measured by statements in the specification. This judgment brings Canadian law more closely in line with that of our international trading partners and is a significant win for patentees and pharmaceutical innovation in Canada.
For patent holders in the pharmaceutical and technology industries, greater protection and peace-of-mind is offered by the understanding that fulsome disclosure in the specification of their vast patent portfolios will not jeopardize their patent rights
For litigants seeking to invalidate patents, the criteria offered through section 2 of the Patent Act is now harder than ever to make out in the absence of the Promise Doctrine.