QUADRUM TELECOMMUNICATIONS, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6275584 Telephone housing with large capacity vaultExpiredJun 03, 98Aug 14, 01[H04M]
6163603 Coin escrow apparatus with relay switch contact simulatorExpiredNov 04, 98Dec 19, 00[H04M]
6047065 Coin receptacle cover for pay telephonesExpiredAug 20, 97Apr 04, 00[H04M]
6044139 Plastic coin receptacle for pay telephonesExpiredNov 04, 98Mar 28, 00[H04M]
5887053 Coin return anti-stuffing apparatus and methodExpiredSep 20, 97Mar 23, 99[H04M]
5737401 Full coin box signalling device for use with coin telephonesExpiredJun 14, 96Apr 07, 98[H04M, G06M, G07D, G07F]
5709294 Non-jamming coin chute trigger assembly for pay telephonesExpiredApr 26, 96Jan 20, 98[G07F]
5676232 Coin chute trigger assembly for pay telephones with microswitchesExpiredApr 26, 96Oct 14, 97[H01H]
5418851 Shock preventing telephone handset for paystationExpiredMar 31, 94May 23, 95[H04M]
5193113 Protective plate for paystation anti-stuffing deviceExpiredJul 29, 91Mar 09, 93[H04M, B65G]
D330209 High security telephone instrumentExpiredMar 22, 91Oct 13, 92[]
5155765 Telephone paystation lower housing armorExpiredJul 29, 91Oct 13, 92[H04M, B65G]
5134654 High security upper housing shield for telephone paystationExpiredJan 14, 91Jul 28, 92[H04M]
5086465 Armored telephone cord retention bracketExpiredJan 04, 91Feb 04, 92[H04M, H01R, H02G]
5084613 Electronic circuit for telephone paystation coin operated triggerExpiredFeb 21, 91Jan 28, 92[H04M, G07F]
5064116 Coin hopper relayExpiredMay 17, 90Nov 12, 91[B65G]
5058966 Vault liner for use in coin telephonesExpiredJan 11, 91Oct 22, 91[H04M, A47B, G07B]
5038908 Self-locking coin receptacle coverExpiredFeb 26, 90Aug 13, 91[G07F]
4988860 Electronic trigger for prepay type telephone paystationsExpiredMar 09, 90Jan 29, 91[G01N]

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