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Message: <blockquote data-quote="Omid" data-source="post: 3622275" data-attributes="member: 16724">Thank you! Yes, I think Lars had asked this question too and I did not answer it before. I did make some test prototypes using off-the shelf wedge prisms bought from Edmund Optics. I noticed that my ideas work in principle, just need refinements (e.g. using achromatic prisms instead of plain ones I had) so I went ahead with the patent application.I also used indirect evidence (from other devices or fields of optics that I am familiar with) to check the validity of the concepts. Of course the final product needs to be fully tested and may need additional optical elements but that can be done by the brand or the manufacturer who licenses the design.As an inventor, it is not my duty to make the best and final optical design of the invention. It is my duty to describe the key elements and their interrelation such that the resulting device is "novel". I also need to explain what this novel device does. US Patent and Trademark Office does not require a working prototype of an invention. (It did in very early years of its operation). It requires a detailed description of the invention accompanied by drawings such that "a person of ordinary skill in the art" can make and use the invention.</blockquote>