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| Number | Title | Issue Date |
| 5109401 | Radio telecommunication apparatus capable of controlling call charges A radio telecommunication apparatus in which a telecommunication link is made between the user of the apparatus and a second party, a charge rate is obtained from a base station coupled to the apparatus, a first allowable call charge for one call is set, ... | 04/28/1992 |
| 5090050 | Method and apparatus for communicating with radio telephones A radio telephone communication system is provided for communicating with radio telephones associated with a radio telephone system when the radio telephones are operating in a remote geographical area served by another radio telephone system. The radio t... | 02/18/1992 |
| 5063591 | Toll ticketing record generation for billing of intersystem handoff calls in a mobile telephone system A method and system for producing a toll ticketing record for a call with a mobile subscriber moving within the cells of at least two exchanges and generating a toll ticketing record of the call which includes sections which are related to the intersystem... | 11/05/1991 |
| 4955049 | Method of supervising mobile telephone subscriptions in a mobile telephone system A method of supervising the subscribers in a mobile telephone system to detect audulent use of a mobile telephone. A fraudulent subscriber (MS2) can have the same identification number (12) as that (11) of a legitimate subscriber (MS1) and the operator of... | 09/04/1990 |
| 4914686 | Cordless phone data logger A remote data logging and telecommunication system utilizing a cordless telephone as a convenient two-way wireless link between a location of data collection and storage and a distant station. The distant station can command the data logging system to log... | 04/03/1990 |
| 4273962 | Impulse metering of local telephone switching offices via a DAMA DOMSAT communication system Impulse metering at local telephone switching offices in a DAMA DOMSAT communication system involves the storage of billing rate information in the control computer equipment at a master station. This billing information is maintained in the form of a loo... | 06/16/1981 |
| 4233473 | Comprehensive automatic mobile radio telephone system In a multi-channel mobile radio telephone system with multiple base stations covering different geographical areas, mobiles may move freely from area to area and automatically originate and receive calls to and from a landswitched telephone network by dir... | 11/11/1980 |
| 4112257 | Comprehensive automatic mobile radio telephone system In a multi-channel mobile radio telephone system with multiple base stations covering different geographical areas, mobiles may move freely from area to area and automatically originate and receive calls to and from a land-switched telephone network by di... | 09/05/1978 |
