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| Patent ID | Title | Date Filed |
| 5812651 | Telephone number parser for wireless local loop telephones
| February 29, 1996 |
| 5812650 | Method and apparatus for intercepting potentially fraudulent
| February 23, 1994 |
| 5809126 | Telephone bar device
| March 5, 1996 |
| 5809125 | Method and apparatus for intercepting potentially fraudulent telephone calls
| January 25, 1994 |
| 5805685 | Three way call detection by counting signal characteristics
| November 15, 1995 |
| 5799071 | Telecommunications cost-minimizing system
| October 5, 1992 |
| 5754775 | Method and apparatus for formulating connection addresses on a PC conferencing system supporting multiple transport type
| September 27, 1995 |
| 5745257 | Communication device
| December 19, 1995 |
| 5742669 | Telephone for storing particulars of outgoing calls and/or special service codes
| December 8, 1993 |
| 5717743 | Transparent telephone access system using voice authorization
| October 23, 1996 |
| 5710808 | Telephone dialling code processor
| August 11, 1995 |
| 5706341 | Active digit cancelling parallel dialer
| December 30, 1994 |
| 5694461 | Method for controlling long distance calling using a multi-frequency receiver
| May 6, 1996 |
| 5590182 | System for interception and transmission of communication signals on telephone and data lines
| June 22, 1994 |
| 5570418 | Device for detecting operation state of telephone hook switch
| June 1, 1995 |
| 5563936 | Lockout telephone
| June 7, 1995 |
| 5561712 | Hands free phone set with hand held remote control for controlling telephonic functions
| June 11, 1992 |
| 5559874 | Telephone service protection device
| March 13, 1995 |
| 5553131 | Providing the most cost-effective long-distance telephone service based on milage band rates
| July 9, 1993 |
| 5535265 | Method and circuitry for controlling voice mail, call logging and call blocking functions using a modem
| November 15, 1993 |
| 5509067 | Method and apparatus for speed dialing via one-touch and two-touch operation
| February 25, 1993 |
| 5497411 | Telecommunications card-access system
| March 14, 1994 |
| 5495528 | Digital telephone control interface system
| November 30, 1994 |
| 5471524 | Toll call restrictor method and apparatus
| September 15, 1992 |
| 5469499 | System for securing access to equipment connectable to a telephone communication channel
| November 29, 1993 |
| 5452346 | Telephone apparatus with caller identification
| April 26, 1994 |
| 5448630 | Secure programmable telecommunication timer
| September 30, 1993 |
| 5440622 | Telephone for inhibiting specific calls dialed by an audible tone generator
| January 26, 1994 |
| 5414751 | Portable telephone apparatus responsive to control signals obtained through a connector and through a wired telephone line for a mending the operational program
| May 18, 1992 |
| 5384842 | Programmable telephone
| December 5, 1991 |
| 5317632 | Timed telephone silencer. (telephone silencer with timer function)
| October 18, 1991 |
| 5274698 | Method of restricting telephone calls in a private branch exchange system
| March 16, 1992 |
| 5274367 | Device for in-service monitoring of communication transmission equipment
| October 22, 1990 |
| 5247572 | Apparatus for control of storing information into dial memories in a telephone set
| October 20, 1992 |
| 5228075 | Telephone capable of selectively accepting callers and enabling partial recognition of callers
| November 27, 1990 |
| 5212810 | Terminal equipment of a vehicle radio telephone system
| June 15, 1990 |
| 5200995 | Universal outgoing call restriction circuit
| December 24, 1990 |
| 5189696 | Data communication apparatus
| April 23, 1991 |
| 5128980 | Automatic paging telephone set and method for controlling thereof
| June 29, 1990 |
| 5127045 | Identifying telephone controller system
| November 16, 1989 |
| 5086459 | Timing circuit and a secure telephone jack utilizing this circuit
| February 23, 1990 |
| 5086456 | Dial unit detachably mounted on public telephone for equal access
| April 16, 1990 |
| 5054059 | Telephone dialing system for specialized services
| October 24, 1989 |
| 5022067 | Telephone call security system
| April 20, 1990 |
| 5003586 | Dial tone interrupt device
| November 2, 1989 |
| 5003575 | Method and apparatus for storing and forwarding voice signals with controlled access
| December 24, 1987 |
| 4993062 | Telephone control system including stored blocked and allowed telephone numbers
| February 10, 1989 |
| 4975943 | Telephone set having outbound call restriction logic circuit
| July 13, 1989 |
| 4965459 | Telephone line security system
| May 26, 1989 |
| 4953202 | Telephone line access control
| January 13, 1988 |
| 4947422 | Personalized telephone for automatic access to operator services
| October 26, 1989 |
| 4924512 | Method and apparatus for preventing recognition of a telephone dialing signal
| January 6, 1989 |
| 4924499 | Timer control for telephone
| February 25, 1988 |
| 4893335 | Remote access telephone control system
| March 20, 1986 |
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