CARROLL TOUCH, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4,943,806 Touch input device having digital ambient light samplingExpiredDec 06, 88Jul 24, 90[G09G, H03K]
4,818,859 Low profile opto-device assembly with specific optoelectronic lead mountExpiredJun 01, 87Apr 04, 89[G01V]
4,761,637 Touch input deviceExpiredNov 05, 86Aug 02, 88[G08C]
4,713,534 Phototransistor apparatus with current injection ambient compensationExpiredFeb 18, 86Dec 15, 87[H01J]
4,684,801 Signal preconditioning for touch entry deviceExpiredFeb 28, 86Aug 04, 87[G09G]
4,672,364 Touch input device having power profilingExpiredJun 18, 84Jun 09, 87[G08C]
4,645,920 Early fault detection in an opto-matrix touch input deviceExpiredOct 31, 84Feb 24, 87[G01V, H01J]

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