COMTECH RESEARCH UNIT LIMITED

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4670364 Photomask for electrophotographyExpiredMay 31, 85Jun 02, 87[G03C, G03F]
4616237 Data storage mediumExpiredSep 26, 83Oct 07, 86[B05D, G03C, G01D, B32B]
4563080 Electrophotographic liquid developing apparatus and methodExpiredJan 16, 84Jan 07, 86[G03G]
4532197 Intense pre-illumination electrophotographic processExpiredMay 17, 83Jul 30, 85[G03G]
4524116 Electrophotographic contact printing and master thereforeExpiredMay 17, 83Jun 18, 85[G03G]
4522482 Information storage and retrievalExpiredFeb 14, 83Jun 11, 85[G03G]

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