D.H. BLAIR & CO., INC.,

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5170364 Feedback system for load bearing surfaceExpiredDec 06, 90Dec 08, 92[A47C]
5060174 Method and apparatus for evaluating a load bearing surface such as a seatExpiredApr 18, 90Oct 22, 91[A47C, G01N, G06F]
5004196 Keyboard accessoryExpiredNov 15, 89Apr 02, 91[A47F]

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