TRILLIUM TELEPHONE SYSTEMS, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5202883 Digital key stystem architectureExpiredJul 31, 89Apr 13, 93[H04G]
5046188 Data interface for telephone systemExpiredFeb 21, 89Sep 03, 91[H04M]
4887293 Trunk circuit with loop length gain equalizationExpiredFeb 22, 88Dec 12, 89[H04M]
D304193 Cartridge for telephone system equipment cabinetExpiredNov 18, 86Oct 24, 89[]
D300426 Communication systems equipment cabinetExpiredDec 01, 86Mar 28, 89[]
4805211 Subscriber set programming moduleExpiredNov 07, 86Feb 14, 89[H04M]
4788720 Programmable subscriber setExpiredSep 03, 86Nov 29, 88[H04M]
4736406 Expansion subsystem for use in a communication systemExpiredNov 07, 86Apr 05, 88[H04M]
4538031 Home communications and control systemExpiredSep 10, 82Aug 27, 85[H04M]

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