TRIPMASTER CORPORATION

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
D331572 Coupler for transmittal of data from remote computer to host computerExpiredMar 30, 90Dec 08, 92[]
4565922 Key card apparatusExpiredMay 19, 83Jan 21, 86[G06K]
4555619 Driver key car identifying systemExpiredMay 19, 83Nov 26, 85[G06K]
4547661 Key card receiverExpiredMay 19, 83Oct 15, 85[G06K]

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