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If Mickey fell into the public domain, he would have the same legal status as other formerly copyrighted works, like Betty Boop. People could sell DVDs of expired Mickey Mouse films and could sell Mickey Mouse plush animals, Mickey Mouse sheets, Mickey Mouse watches, etc. A copyright has far greater legal power than a trademark. Mickey Mouse would remain a trademark for Disney, but only when applied to Disney businesses. Someone could legally start Mickey Mouse Fried Chicken.
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This is wrong in every way.
If Steamboat Willie fell into the public domain, the only consequence would be that any individual could sell copies of Steamboat Willie. Period. Disney’s trademark use of Mickey Mouse - the name, the likeness, the mouse ears, everything - would be completely protected. And strongly so, since trademark protection is much stronger, in my judgment, than copyright protection, which protects only specific expression rather than general use.
Nobody could start Mickey Mouse Fried Chicken. Trademark law allows common words to be use in non-competitive industries, true. However, the basis for the law is to prevent consumer confusion. Trademarked and made-up words and names are almost never allowed to have any other use, no matter how non-competing. You will never find Kodak dog food or a Xerox diner because the presumption would automatically be that these were enterprises connected to the more famous firm.
Trademarks do fall into disuse (considered “dead”) if a firm no longer actively promotes and protects the use of that trademark. Contrary to your assertion, this did not happen to Betty Boop. Trademarks are easily searched for by using the government’s Trademark Electronic Search System (TESS). A quick search there shows that Betty Boop has multiple “live” trademarks affixed to it, all of them registered by Fleischer Studios, Inc and Hearst Holdings, Inc. Max Fleischer is of course the originator of the Betty Boop cartoons.
Your FindLaw cite is merely an editorial commentary, no different from and with no more authority or relevance than any op-ed piece. These are expressions of opinion only and often are from wackjobs.
BTW, your notion that composers - or writers or artists or any other creative mind - discover rather than invent their work is entirely contrary to the very existence of copyrightable work. No such thing could exist if works were discovered. Your statement is equivalent to saying that no writing is copyrightable because it all depends on the same 26 letters and all somebody does is place them in the right order.
In sum, I can’t find a single factually correct statement in your posts. They remain, nonetheless, original to you and automatically copyrighted.