Hal - A tough and interesting question (one that veers towards the
business of the place I work, creating licenses for the use of
copyrighted works...).

In bumper-sticker speak: Copyright is (basically) 95 years. Trademark is
forever (unless something happens to the mark). If your estate smartly
markets your image and likeness as a trademark, it can go on pretty much
forever.

For example, I think --  I don't know -- that the Mark Twain Foundation
would have collected licensing fees for the appearance of the Mark Twain
character in an episode of Star Trek, The Next Generation, created
during the 1990's.

For the license status of other examples you cite - they are
find-out-able, given time and world enough ;-)


DDD