The problems with every kind of scheme to monopolize patents is that A: eventually the patents run out and become worthless. B: new patents are created ad infinitum. C: most patents are for basically worthless innovations.

Ansco BTW bought the Goodwin patents for roll film, and successfully sued Kodak for infringement, even though so far as I know Ansco themselves had infringed on the patents before acquiring them.

GM went bankrupt once because Durant would ceaselessly buy up ever automobile related patent he could find.