Those sites you mentioned they don't have the certain wyatt earp comic I'm looking for.

the Wyatt Earp comic that Im looking for has an issue where he fights the Durfee gang. its issue 26 or 29 of some old wyatt earp comic from an old comic company based on Marvel back in the 1950s

Oh come on. How can Marvel have copyright rights for Atlas? Atlas is old ancient stuff.

Epic and Star maybe Marvel still have copyright yada but Atlas?

95 years.  I don't anticipate anything will ever again go into the Public Domain. 

Copyright on "work for hire," so most comics, films, tv shows, etc, is for 95 years from the date of publication or 120 years from the date of creation.  As a practical matter the latter is almost never used.  For works that are not "work for hire" it is the life of the author plus 70 years.  

As best I can tell, works that were initially copyrighted by a corporation, but were renewed by the author (Asimov's short stories, for example) are fixed at the 95 year term. 

One thing that most people don't realize is that Public Domain is the default position.  There was no common-law copyright.  Copyright is a creature of statute and the first copyright laws were enacted to protect publishers.  Based on this, you had to ACTIVELY copyright your work to protect it until the beginning of the rise of multi-media empires.  

I have no issues with protecting creators and allowing them and their family the benefit of their creations.  But at some point the control becomes so attenuated from the creator that it's ridiculous.  I find it particularly ironic that one of the main players in the continued expansion of copyright is Disney, a company that benefited enormously from mining and using the Public Domain for its movies.  The rise of mass-media/work-for-hire mediums such as film, television and comic books, along with the consolidation of music-publishing rights has essentially put the cultural history of the 20th Century in a half-dozen or so corporations.  

Looking at a specific example, Edgar Rice Burroughs is interesting as his early work fell into the public domain and his later work was saved.  The last of Burroughs' children died forty years ago.  His most prominent grand-child died almost a decade ago.  So we are at a point where we are benefiting his great-grandchildren, all of whom were born after Burroughs died...if we are benefiting them at all, because the rights are held by Edgar Rice Burroughs, Inc. and I can't be arsed to figure out who the shareholders are.  

Counter-example, looking at important SF creators, is Mary Shelley and Frankenstein.  The book obviously fell in to the public domain and as a result we have had the diverse tapestry of the use of the character...from the brilliant (Frankenstein '31, Young Frankenstein) to the absurd (Jesse James Meets Frankenstein's Daughter).  We as a people have been enriched in film, television, comics and books because the character has been available rather than being controlled by some shirt-tail relative many generations removed or, more likely, a multi-national corporation.