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Charlieplexing

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I wouldn't know, but I wouldn't have thought it's something you could patent, as it's probably been done many times in the past? - well before 'Charlie' wrote about it in a Maxim application note.
 
Patent 4,394,653 looks relevant, but since it was filed in 1980 it's probably expired long ago.

This should NOT be taken as legal advice.
 
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