Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 4837802 | Radio communication method and system A method and system for radio communication between at least one parent communication unit and a plurality of slave communication units. A slave communication unit transmits an automatic answer signal in response to an incoming call receipt signal transmi... | 06/06/1989 |
| 4817126 | Call box A communication system having a base station and a number of field units employs a virtual hold technique and a self-testing technique. In the virtual hold technique, when a field unit is put on hold, the communication channel previously used by the field... | 03/28/1989 |
| 4802200 | Radio telephone system control apparatus and method A method and apparatus for controlling a radio telephone system of the type wherein a connection between a wired telephone channel and a plurality of radio telephone handsets is controlled by a single base station connected to the wired telephone channel,... | 01/31/1989 |
| 4790000 | Portable radio telephone system In order to make it possible to communicate between a portable radio telephone set through an existing public cellular radio telephone system and a private radio telephone system disposed inside the cells of the public cellular radio telephone system, an ... | 12/06/1988 |
| 4776001 | Radio telephone system control apparatus and method A method and an apparatus are disclosed for controlling a radio telephone system comprising a single master apparatus connected to a subscriber line and a plurality of radio telephone sets connected to the master apparatus by way of radio channel. When a ... | 10/04/1988 |
| 4768218 | Radio key telephone system having a common signaling channel In a radio key telephone system connected through N subscriber lines to a telecommunication switching system, each of M (where M is larger than N) terminal stations has a multiple access radio transceiver capable of switching to one of (N+1) radio channel... | 08/30/1988 |
| 4741019 | Cordless telephone A master station 1 is connected with a telephone line 2. For this master station 1, a plurality of hand sets are provided. Each hand set is set to different transmitting and receiving frequencies to communicate with the master station 1. Each hand set gen... | 04/26/1988 |
| 4731812 | Installation with portable, wireless telephone sets In an installation containing at least one stationary unit (5) with a radio transmitter and a radio receiver, both with short range, and at least one, and preferably several portable, wireless telephone sets (4) with a radio transmitter and a radio receiv... | 03/15/1988 |
| 4682351 | Cordless Telephone system A cordless telephone system which is capable of connecting a plurality of mobile stations to a single base station over a radio link is disclosed. The mobile stations are classified into a master and slaves. While the master mobile station is capable of o... | 07/21/1987 |
| 4650928 | Signal transmitting and/or receiving apparatus A cordless telephone comprises a base unit and a plurality of remote units. The remote units are respectively adapted to establish radio communication at separate times with the base unit. Each remote unit generates a particular code in a particular forma... | 03/17/1987 |
| 4568800 | Multi-channel access (MCA) radio telephone system A multi-channel access (MCA) radio telephone system completes calls from conventional telephone systems over a plurality of shared radio channels to a base station serving a plurality of substations connected to a second telephone set. The MCA radio telep... | 02/04/1986 |
| 4421952 | Multi-frequency busy signal synthesizing circuitry Circuitry for synthesizing a busy or reorder tone comprised of a first tone having a frequency of 770 Hz and a second tone having a frequency of 1150 Hz is described. The inventive synthesizing circuitry requires only one clock oscillator, whose output is... | 12/20/1983 |
