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Re: [photo-3d] Digest Number 301

  • From: Olivier Cahen <o_cahen@xxxxxxxxxxxxxxxx>
  • Subject: Re: [photo-3d] Digest Number 301
  • Date: Thu, 19 Oct 2000 11:12:09 +0200
	Of course, the Pulfrich effect, published in 1922, is not protected by
patents. Some color filters, absolutely useless for viewing Pulfrich
pseudo-stereo images, were patented, but they do not add any improving.
You will perfectly see in depth by only wearing one polarising glass,
such as that you are currently using for stereo projections, or one
ordinary sunglass.


Message: 17
   Date: Fri, 13 Oct 2000 12:54:35 +0200
   From: "Ernest Barnes" <barnes3d@xxxxxxxxxxx>
Subject: Pulfrich-Info

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.