I'll second valo's advice that you should do whatever engineering discipline interests you the most. That way, if you decide at a later date that you aren't interested in law, you can still find a job in a field that you like. If you don't care about electrical work but get a degree in electrical engineering, then decide that you don't want to go into law, you've put yourself in a bad spot. Having said that, I think mechanical engineering is probably less useful that electrical engineering or chemical engineering (or other specialties). I'm a chemical engineer and work on chemical patents, but I also don't have any problem working my way through the engineering to do a mechanical patent. The electrical engineer that I work with is the same way - he can do electrical work or mechanical work. The chemistry and electrical patents are just too abstract for the mechanical guys to get their heads around though, so they're really limited to the mechanical work.
I'll warn you though, at least in the U.S., patent law is not a great field at the moment. When the economy started to struggle, patent law was one of the few types of law (along with bankruptcy law and family law) that didn't take much of a hit. That's because you're patenting what the companies developed 2-4 years after they actually spent the money to research the product. Since companies cut back on research and development a few years ago, that's finally caught up to the patent timeframe, so we're getting less and less work, and that will continue until 2-4 years after the rest of the economy recovers. Because of that, there are more patent lawyers than there are patent law jobs (or in my case, more patent lawyers than there is patent work - which is why I'm stuck spending half my day doing general transactional work), so it's getting tougher and tougher to find a job without getting some kind of graduate degree. I'm really not sure if that applies in Canada or not, but if so, the fact that you'll likely be spending 6+ years getting your engineering degrees is all the more reason to go for the type of engineering that interests you the most.
Again, I don't know a whole lot of specifics about patent law in Canada, but I've been a patent lawyer for the past 2 years in the U.S., so let me know if you have any more specific questions that I might be able to answer.
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