Copyrights (rights to media content) do not lapse because of failure to enforce them.
Trademarks (the right to call your product a specific name) can lapse if members of the general public start associating it with a type of product rather than your specific brand. This happened with “zipper”, “jet ski”, and “popsicle”. But you can’t sue Grandma Smith because she mistakingly referred to an Xbox as “a Nintendo”.
Interesting to note that although HAARP was originally a joint project between the US Air Force, US Navy, DARPA, and the University of Alaska Fairbanks, since 2015 control was transferred exclusively to the University of Alaska Fairbanks.