Not to be a know-it-all, but I do know a little about intellectual property, including patents, and the above comments are generally on track, there is precious little in these revolvers that would be subject to patent protection, other than minor refinements that compertitors could most likely design around. Patentability requires inventiveness over all "prior art" (ie, everything that has ever been done--that's a lot.)
However, apart from "utility" patents (which relate to the structure and function of inventions), there are also "design" patents, relating to the "ornamental" aspect of an article of manufacture. Not surprisingly, Ruger does have at least one design patent on the LCR, see link below to the U.S. Patent Office. (almost forgot, you need a TIFF reader to see it.) Design patents can be useful for preventing "Chinese copies" of articles (or "engineering with cameras", as I call it.)
Of course, our free enterprise system is set up to permit copying of products, so long as any patent coverage has expired, and the goods are not "palmed off" as those of another. This promotes competition and benefits us a consumers.
As we say in my business, "I work both sides of the street", on behalf originators and "emulators", so to speak. I believe in the system.
BTW, utility patents now have a 20-year term from filing, no longer 17 years from issue, which cannot be renewed; upon expiration the subject matter enters the public domain and is free for use by anybody. Design patents have a 14-year term.
Sorry for the dissertation, but I've been saving this since everybody was talking about Colt going after Sig for their P238.
Patent Images