What was the "promise of the patent doctrine"?

What was the "promise of the patent doctrine"?  The short answer is: a controversial doctrine that originated in English law and that, until recently, was applied in Canadian patent law to invalidate patents that made a material false promise about the utility of the invention. A common example would be a claim to therapeutic efficacy in a specification that is not born out. Warning: the content of this doctrine this may seem bizarre to those familiar with U.S. patent law. I learned of the "promise of the patent doctrine" at PatCon9 from Norman Siebrasse, Professor of Law at University of New Brunswick, and founder of the Canadian patent blog: Sufficient Description. Siebrasse provided an in depth analysis of what he calls the"promise of the patent doctrine," or just the "Promise Doctrine," in a 2013 article  in a Canadian law journal. He discussed it further on several posts on Sufficient…

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