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| Number | Title | Issue Date |
| 7409052 | Universal intercom adapter for varying residential wiring systems An intercom adapter used for selecting optionally one of three popular in-place residential wiring systems, in which two switches, each with two circuit-selecting contacts provide four permutations for selecting a circuit compatible for the in-place residential wiri... | 08/05/2008 |
| 7206614 | Phone adapter method and system for vehicles A system includes sleeves each being removably receivable, one at a time, by an adapter connectable to an appliance operable for enabling a user to communicate hands-free on a phone when the phone is connected to the appliance. The sleeves are differently configured... | 04/17/2007 |
| 7012523 | System for surveillance of and communication with residential entryway from remote location using existing telephone lines A surveillance system for the entryway of a residence utilizes an existing peephole in a door to install a camera and utilizes the existing telephones in a residence to communicate from within the residence with an individual standing in the entryway. ... | 03/14/2006 |
| 7013000 | MTA intercom feature The present invention provides a media terminal adaptor having an internal logical interface to permit communication connections to be established between ports of the MTA. ... | 03/14/2006 |
| 6975713 | Providing multiple line functionality using alternative network telephony Providing multiple line functionality using alternative network telephony is disclosed. A local telephone installation comprises a first and second telephone equipment (associated with a first and second local node, respectively), and local telephone wiring connecte... | 12/13/2005 |
| 6411694 | Arrangement for improving a telephone system The present invention relates to an arrangement, for improving a telephone system in which a plurality of analogue phones are connected to a single line, and for the purpose of providing an arrangement which can solve the problem related to interruption o... | 06/25/2002 |
| 5933775 | Mechanism for providing wireless audio and control channels for personal computer interactive phone (PCIP) system An interface circuit provides a wireless channel and a line channel to a telephone set. The wireless channel is coupled to a controller (e.g. a PC) and to another telephone set, and the line channel is coupled to a telephone network. A switch circuit conn... | 08/03/1999 |
| 5881142 | Integrated communications control device for a small office configured for coupling within a scalable network An integrated communications control device integrates the telecommunications environment of a small office with an interface to the telephone network. The device is a stand alone unit including a programmable control processor configured by a user based ... | 03/09/1999 |
| 5309510 | Door intercom device A door intercom device for allowing a dwelling occupant to easily converse with an individual disposed on an exterior side of a dwelling door includes a thin sheet metal mounting bracket possessing a generally U-shaped clamp portion dimensioned to engage ... | 05/03/1994 |
| 4821319 | Single line telephone communication system A communication system for use with a single pair of externally provided telephone wires and a single pair of in-house wires for the provision of full intercom services and/or PABX type features to a plurality of subsets includes a line interface module c... | 04/11/1989 |
| 4716584 | Noise-free terminal station compatible with existing master stations A terminal station operating with a current supplied from a master station exchanges signals with it through cable conductors, one of the cable conductors being grounded at the master station to allow the current to return from the terminal station. A rec... | 12/29/1987 |
| 4700379 | Aircraft communications apparatus Aircraft communications apparatus includes a permanent communications system, a temporary communications system and an interface coupler connecting the permanent and temporary communications systems. The coupler consists of a plurality of opto-isolator ci... | 10/13/1987 |
| 4485273 | Intercom adapter for telephones Apparatus for adapting a standard telephone set for use in an intercom system communicating over the two "extra" conductors of the four-conductor wiring typically provided on the premises of a telephone subscriber. The adapter is inserted between the tele... | 11/27/1984 |
| 3941933 | Paging intercommunication system Intercommunication between a plurality of stations is established through a pair of signal lines to which portable units are connected, each unit having its own power supply contributing to a low DC operating voltage maintained across the signal lines thr... | 03/02/1976 |
