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The only way is do a patent search, unless the lure has "patented" on the package, some do, but sometimes they use "ptented to scare off people, the patented part of the lure may only be a very small part. I have seen major companies putting patented on a new hot design, but when I looked up the patent, it was only on the "salt" in the lure, not the design, so anyone could copy it, just leave out the salt.
Your one of the few that actualy care if they infringe, I'm glad to hear that you do.
It used to be true, you could copy anything for personal use, but they changed the law. Today it is infringing the same as selling them. "USE" is spelled out clearly now in patent law
Qoute from http://www.uspto.gov/web/offices/pac/doc/general/index.html#patent
The right conferred by the patent grant is, in the language of the statute and of the grant itself, ?the right to exclude others from making, using, offering for sale, or selling? the invention in the United States or ?importing? the invention into the United States. What is granted is not the right to make, use, offer for sale, sell or import, but the right to exclude others from making, using, offering for sale, selling or importing the invention.
It's hard to belive but many people have patents on things they can't even make themselves, because they have only patented part of the item, other parts of it are covered by other's patents that are in force, thus blocking them from even making a prototype, unless they bought the patented part from the patent holder