I live in Canada and came up with a product idea for the archery industry and through my research I came across a United States Patent that is very similar to what I had made (prototype).I was also unable to find the patented product on the market anywhere and are still looking.
Question 1a. Can I apply for a patent in Canada for this similar product that has a patent in the United States if my version has a significant improvement ?
Question 1b. Can I apply for a patent in the United States for the improvement on the already patented product?
Question 3. Can I manufacture and sell my own version (or exact version) of the patented product in Canada if it is only protected in the United States?
Question 4. What could potentially happen (financially) if I were to sell my improved version in the United States without a patent on the improvement?