I think that what you're looking for is American Western Arms or AWA International. Colt sued AWA in 2002, claiming that the single action revolver made for AWA by Armi San Marcos was too close a copy of Colt's Model P revolver.
Colt made some rather broad claims, particularly that only Colt could make a single action revolver and that Colt, as a company, had no knowledge of any other company making single action revolvers at that time. Seriously. They claimed that.
The gist of the lawsuit was that the public could not tell the difference between a Colt 1873 SAA and the AWA Peacemaker, even though the AWA model was marked "Made in Italy" and with AWA's name. I believe that Colt contended that neither marking was present on the AWA revolvers in rather blatant difference with reality.
AWA won the lawsuit, eventually, but the effort and expense pretty much ruined the company, which may have been Colt's aim in the first place.
Colt did the same thing to Bushmaster over the M4 a few years back. I believe that they lost that one, too.
Maybe I shouldn't be taking Colt to task too badly - I suppose the case can be made that they're defending their copyright, perceived or real, which, from my understanding, is necessary under US law.
EDIT: Awww, no fair editing your post!
I'm really not a dummy!