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| Patent ID | Title | Date Filed |
| 5568512 | Communication system having transmitter frequency control
| July 27, 1994 |
| 5561666 | Apparatus and method for determining operational mode for a station entering a network
| March 6, 1995 |
| 5557606 | Routing of voice communication at a cell site in a land mobile radio system
| June 10, 1994 |
| 5544159 | Duplex interconnect/dispatch trunked radio
| April 13, 1995 |
| 5533015 | Transmission system comprising at least two subscriber devices exchanging information signals in the simplex of half-duplex mode
| June 8, 1994 |
| 5526346 | Tree structured star telecommunication system including multitrate frames
| September 12, 1994 |
| 5506965 | Microcomputer incorporating communication device
| May 1, 1995 |
| 5506837 | Cellular radio communication system which is selectively convertible into a trunked radio communication system for group calls
| February 10, 1994 |
| 5504738 | Apparatus and method for full-duplex ethernet communications
| April 15, 1994 |
| 5493698 | Radio apparatus for simulataneously transmitting and receiving signals using a simple frequency
| February 25, 1994 |
| 5450618 | Full duplex and half duplex communication unit with volume setting
| April 30, 1992 |
| 5432775 | Auto negotiation system for a communications network
| December 3, 1993 |
| 5404351 | Data transmission unit having a plurality of ports
| March 18, 1994 |
| 5396486 | Data communications equipment interface leads to signal half-duplex or full-duplex operation
| December 17, 1992 |
| 5390038 | Half-duplex communications interface
| June 11, 1992 |
| 5388091 | Communications system for communications between an electronic control apparatus and a test apparatus
| April 13, 1993 |
| 5386435 | Frequency hopping spread spectrum data communications system
| October 29, 1993 |
| 5379294 | Multipurpose analog front-end circuit
| March 28, 1991 |
| 5377184 | Method of controlling TWA link in a communications adapter by monitoring buffer fill levels
| March 2, 1992 |
| 5355368 | Method for allocating time slots for transmission in a half-duplex time division multiple access point-to-multipoint bidirectional transmission network
| January 29, 1993 |
| 5349635 | Half-duplex or full-duplex automode operation for use in data communications equipment
| November 19, 1992 |
| 5311114 | Apparatus and method for full-duplex ethernet communications
| October 27, 1992 |
| 5305306 | Station-to-station full duplex communication in a token ring local area network
| February 25, 1993 |
| 5274626 | Earth station capable of carrying out communication without a control station
| February 2, 1990 |
| 5272694 | Synchronization of terminal stations in a multirate half-duplex tree-structured network
| March 20, 1992 |
| 5263083 | Method and apparatus for sharing speakerphone processor among multiple users
| December 10, 1990 |
| 5260970 | Protocol analyzer pod for the ISDN U-interface
| June 27, 1991 |
| 5212685 | Control circuit for half-duplex/simplex interface in communication system
| March 21, 1991 |
| 5155726 | Station-to-station full duplex communication in a token ring local area network
| January 22, 1990 |
| 5136576 | Transmission system
| September 1, 1989 |
| 5121382 | Station-to-station full duplex communication in a communications network
| October 11, 1989 |
| 5091906 | Quasi-duplex radio system using bi-directional hole extension
| December 18, 1989 |
| 5054019 | Transfer direction turnaround in network data communications
| January 13, 1989 |
| 5051980 | Data communication interface device
| July 12, 1990 |
| 4996683 | Optical transmission device
| October 12, 1989 |
| 4989236 | Transmission system for telephone communications or data transfer
| January 6, 1989 |
| 4972432 | Multiplexed synchronous/asynchronous data bus
| January 27, 1989 |
| 4949335 | A TDM quasi-duplex system
| January 23, 1989 |
| 4924479 | Communication control system
| August 10, 1987 |
| 4924456 | High speed modem
| August 29, 1988 |
| 4897831 | Data transmission/reception apparatus
| February 29, 1988 |
| 4841521 | Method and system for bidirectionally transmitting data
| May 28, 1987 |
| 4771417 | High speed modem
| September 18, 1986 |
| 4712210 | Signal conversion circuit for interconnecting coaxial cable and a twisted pair
| September 7, 1984 |
| 4680781 | Data telecommunications system and method with universal link establishment
| October 30, 1985 |
| 4653044 | Data communicating method with capability of full-duplex communication over two-wire circuit
| April 26, 1985 |
| 4641126 | Multiple-mode electrical power and communications interface
| December 7, 1984 |
| 4635285 | Communication system with voice priority for remote stations
| April 12, 1984 |
| 4622551 | Half-duplex industrial communications system
| October 27, 1983 |
| 4599719 | Full duplex data set with half-duplex emulation
| June 18, 1984 |
| 4578533 | Switchable line powered modem
| February 17, 1984 |
| 4556864 | Apparatus and method for communicating digital information on AC power lines
| August 26, 1982 |
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