Assignee
TOUCHSTONE APPLIED SCIENCE ASS
US·3 granted patents·84 citations·filing 1989–1992
Top patents by PatentIndex Score
3 records- 0167US5102341ATest answer and score sheet deviceTOUCHSTONE APPLIED SCIENCE ASS·Filed 1990·Granted Apr 7, 1992·50 cites·13 claims
- 0251US5293273AVoice actuated recording device having recovery of initial speech data after pause intervalsTOUCHSTONE APPLIED SCIENCE ASS·Filed 1992·Granted Mar 8, 1994·16 cites·15 claims
- 0344US4943239ATest answer and score sheet deviceTOUCHSTONE APPLIED SCIENCE ASS·Filed 1989·Granted Jul 24, 1990·18 cites·23 claims
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