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Technology Stocks : Research Frontiers (REFR) -- Ignore unavailable to you. Want to Upgrade?

To: R. M. Rosenthal who wrote (510)	2/8/1998 4:25:00 PM
From: Paul M.	Read Replies (1) \| Respond to of 50136

RMR, The problems were solved. But realize I was referring not only to current problems surrounding production, but problems that go back over the years addressing the basic practicality of SPD. The paper discussed the history of the problems and their solutions. This made it clear to me why it took years to get to the point where we are now. For instance, some of the serious problems were particle settling, particle clustering, color change by heat, reduction of off-state optical density, and degradation by ultraviolet light. All of the foregoing problems were solved using a liquid suspension of solid particles of colloidal size, a polymeric system for helping to disperse the particles in a liquid, a polymeric stabilizer, matching the densities of suspended particles to the suspending medium, adding a polymeric stabilizer, film approaches, etc, etc, etc. Toward the end of the paper, they turn to problems they solved in getting it ready for production. The paper is complicated and too long to post. I suggest that anyone who is interested in the scientific nitty-gritty order a copy from SPIE (1-360-676-3290 x460). Ask for SPIE volume 3138 "Developments in Suspended Particle Devices (SPD)". PM