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| Number | Title | Issue Date |
| 6888934 | Vehicle intercom system A vehicle intercom system allows conversation between individuals located, respectively, inside and outside of a vehicle. The voice units are linked by a vehicle controller area network eliminating the need for independent wiring of an intercom system. ... | 05/03/2005 |
| 6760419 | Method and apparatus for interfacing a drive-thru intercom system with a telephone system A method and system for interconnecting a telephone system and an intercom system. In one exemplary embodiment, telephone switchgear is connected to a telephone interface which provides separate voice transmit and receive channels. For example, an E&M tie line modul... | 07/06/2004 |
| 6574341 | Hand-free switch device for wireless intercom A hands-free switch device for a wireless intercom includes a signal reception circuit, a sensor, a voice transmission detecting circuit, a manual switch, a determining and controlling unit circuit, a reception/emission switching circuit, a microphone, an... | 06/03/2003 |
| 5644630 | Intercom system for a service establishment An intercom system (110) for a drive-in restaurant (102) is integrated with a point of sale system (118) through a computer (126) that provides for tracking and managing intercom calls to operators taking orders. The computer indicates to point of sale sy... | 07/01/1997 |
| 5483528 | TDM digital matrix intercom system A time division multiplexing ("TDM") digital matrix intercom system for connecting intercom stations. The system includes a digital switching system receiving audio input communications signals from at least some of the intercom stations, and sending audi... | 01/09/1996 |
