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Canadian patent law and “filing date” - what exactly is the benefit of having a “priority date”?

According to the Canadian patent info site, here, a patent application can claim a priority date of a previous patent, filed in Canada or in a country with an appropriate treaty, as long as the ...
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Guideline for self-filing a provisional patent application

I'm looking to file a provisional patent application in Canada and the US. From what I've been told, the process is not easily out-sourceable, and I'm on a shoestring startup budget. I would like to ...