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In Canada, it has long been understood that when it comes to the
construction of claims in a patent litigation matter, only
information provided by the four corners of the
specification was admissible in the court proceeding. This
means that the claims were purposively construed with a mind
willing to understand and based on the teachings of the
description. More than 20 years ago, the highest court in Canada
affirmed that allowing extrinsic evidence, in the form of
admissions made during the prosecution of the Canadian patent