Do a search on the internet for an international patent on the item, if it is only a local (US) patent then you can copy it.
If it does have a international patent you can copy it but it has to be a minimum of a 10% difference.
The patent is not for the product as such, it's for the way the product used, and how used.
Lets use a fish tank for example, a square tank is different to a rectangle tank which is different to a hexagon. The tank itself can not be patented because it is really just a container, if it was patentable then everything down to a jam jar (really small fish) would be sue-able. Some things just can not be patented.
Another example (hard to think of items when coffee hasn't kicked in), lets say toilet paper, if the patent was issued it would be to wipe ya butt, but if you use the tp to blow your nose, stop a blood nose, wipe up a mess ... then it is outside the patent description. I haven't looked to see if there is one on tp, I doubt it, but when you apply for a pattern you have to describe everything about it, the material, the operation, intended purpose ...
Say you made a roll of paper - same as toilet paper but square sheets instead of rectangle and sold it as a nose wiper, mess wiper ... basically no mention of wiping your butt then you have a totally different product although it can be used the same as the toilet paper. I'm sure a smartass lawyer would try sue you but as you never used the word toilet in your advertising or patent they wouldn't have a leg to stand on, they would have to turn the other cheek 
copyright is for written or drawn, not products. Everything, this post included has an automatic 50 year copyright but no one worries about it. The song "happy birthday" actually has a filed copyright on it but everyone still uses it.
We childproofed our homes, but they are still getting in.
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