The supreme court of the United States has definitively ruled that patentable items can no longer be protected by copyright once the patent has been expired.
Here is an expired patent describing such a device. And there were a number of devices before that. And schematic diagrams and circuits in magazines for white noise/sleep generators long ago.
It's a shame that people are so full of themselves that they think they are truly that special that they somehow made a unique creation here. But actually it's likely worse in that people think they found an easy target and want to take what they can with a bad faith claim.
This is a time where counter claims under the DMCA need to be filed against these bad faith claims and collect damages to help prevent further abuse.
Maybe even make google a co-defendant.