Sounds like the idea is that the beam itself is invisible, and it becomes visibl... | Hacker News

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		monochromatic on Oct 23, 2015 \| parent \| context \| favorite \| on: Patent US5443036 – Method of exercising a cat Sounds like the idea is that the beam itself is invisible, and it becomes visible once it hits something. Poorly worded though.

mikeash on Oct 23, 2015 [–]

So you can work around this patent with a fog machine?

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