QUADRUM, S.A. DE C.V., A CORP. OF MEXICO

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4942748 Security mechanism for telephone paystationsExpiredJun 09, 89Jul 24, 90[E05B]
4940296 Plastic housing for telephone paystationExpiredFeb 10, 89Jul 10, 90[A47B]
4938547 Simplified metal housing for telephone paystationExpiredFeb 10, 89Jul 03, 90[A47B]
4922525 Paystation theft inhibiting circuitExpiredJul 03, 89May 01, 90[H04M]
4903294 Low voltage operated coin relayExpiredJan 09, 89Feb 20, 90[H04M]
4896348 Paystation monitor circuit to prevent fraudulent useExpiredJul 01, 88Jan 23, 90[H04M]
4852373 Lock protector assemblyExpiredFeb 03, 89Aug 01, 89[E05B]
4831650 Adaptive telephone receive controlExpiredMay 16, 88May 16, 89[H04M]
4821313 Paystation transmitter ground detect circuitryExpiredJul 01, 88Apr 11, 89[H04M]
4815123 Coin-operated telephone apparatusExpiredJan 11, 88Mar 21, 89[H04M]
4809319 Coin-operated telephone apparatusExpiredJan 11, 88Feb 28, 89[H04M]
4719648 Coin relay drive and switching circuit for paystation telephone instrumentsExpiredDec 13, 85Jan 12, 88[H04M]
4660706 Coin receiving mechanism having a slideable door to prevent coin insertion after stuffingExpiredOct 21, 85Apr 28, 87[G07F]
4429186 Floating battery feed circuit for telephone subscriber line interfaceExpiredSep 30, 82Jan 31, 84[H04M]
4386690 Coin relay selector cardExpiredDec 29, 80Jun 07, 83[G07F]
4192976 Pushbutton call transmitterExpiredDec 29, 78Mar 11, 80[H04M]
4186275 Initial rate override circuitExpiredAug 02, 78Jan 29, 80[H04M]

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