Red Raven is not PD, unless it's one of those odd "the publisher missed it" books; it's what became Human Torch with issue #2.
There's a few others in there in the "known to be unrenwed but we're not touching them because of the company" books in there, as well. Thank you for the list, in any case- it's fascinating to see!
Most of the Platinum books would be PD as well, even if the characters are still under trademark, just because of their age.
Hmm, there's a Man From Planet X on eBay at $135 with a trashed spine on the cover only that looks like an excellent scanning candidate; maybe when I get my tax return...