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[photo-3d] Pulfrich-Info

  • From: "Ernest Barnes" <barnes3d@xxxxxxxxxxx>
  • Subject: [photo-3d] Pulfrich-Info
  • Date: Fri, 13 Oct 2000 12:54:35 +0200
Hello, Dear all,
I would like to know if the Pulfrich system has actually any patent. I understand that this old phisical propertie is public domain. Am I wright?
May be, some glasses, are patented. ( I think that only can refer to the graphic design of them)
Many thanks for your help.
Ernest Barnes.


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