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| Number | Title | Issue Date |
| 5987331 | Communication system to communication system gateway method and apparatus A method and apparatus of linking communication systems of different types. Call requests are directed from a sourcing communication unit in a first communication system (101) to a gateway (114), which translates identity and call type information from th... | 11/16/1999 |
| 5870149 | Video/integrated land mobile dispatch radio and video unit An integrated land mobile dispatch radio capable of accommodating both standard audio transmissions and video transmissions. The push-to-talk switch controls these activities. Video images can be stored and reviewed prior to transmission. Also, video tran... | 02/09/1999 |
| 5533097 | Portable communication system comprising a local and wide area communication units which can store a communication when the wide area communication system is not available A local-area RF communication unit (305) is incorporated in a portable housing, such as a briefcase (101), and adapted to communicate with personal communication devices, such as a handset (105) and notepad (107). One or more wide-area RF communication un... | 07/02/1996 |
| 5408466 | Duplex interconnect dispatch trunked radio A subscriber unit for use with a duplex communication system is described. The present invention contemplates a duplex transceiver which incorporates data and voice handling capability. A microprocessor generates data and DTMF signaling as well as decodin... | 04/18/1995 |
| 5301359 | Bulletin board resource for communication system access A bulletin board communication resource provides a message to communication units regarding available communication systems in a particular geographic area. The bulletin board resource also supports registration of the communication unit with one or more ... | 04/05/1994 |
| 5185796 | Encryption synchronization combined with encryption key identification In an encrypted radio system, transmsitters and receivers can each be provided with a plurality of encryption algorithms (407 and 425) and/or encryption key variables (408 and 426). A unique logical ID (409 and 427) corresponds to each of the above. Durin... | 02/09/1993 |
| 5159695 | Communication system to communication system communication system Independent communication systems are provided with additional receivers that allow the systems to monitor one another's outbound control signalling channels. Secondary control signalling can be interleaved with the primary control signalling information ... | 10/27/1992 |
