Currently the majority of bad press about trivial software patents is all centred around Apple and other smartphone industry players.
A few years ago it was the Amazon "1-click" patent everybody was deriding. (US 5960411)
Going back a few decades when I was getting into computers I recall being shocked to learn that the implementation of a flashing cursor / caret on a computer screen using
XOR was patented and many well known tech companies were paying royalties on it. (US 4197590)
Were there earlier patents before even this that was widely denigrated as obvious and trivial? Did they lead to any court decisions that now constitute important jurisprudence?