You were online in the 1960s? The term "intellectual property law" started to be commonly used after the formation of the World Intellectual Property Organization in 1967.
when I stared coming online, national talk about IP laws was just starting out. I don't keep up to date with law reforms, but in the late 90s mainstream awareness was shifting into this mindset of IP law. and back then, the law still spoke of those 3 concepts on their own. I suppose now it's really just one blob of ownership over ideas for the sake of some misguided market-ideology