Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 4926495 | Computer aided dispatch system A computer aided dispatch system is provided for use in a trunked communication system. The system comprises at least a master file node and a plurality of user nodes. The master file node contains a data record for each subscriber on the trunked communic... | 05/15/1990 |
| 4912705 | Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels A system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber stations may be fixed or movable. The number of time division cir... | 03/27/1990 |
| 4903262 | Hardware interface and protocol for a mobile radio transceiver A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message protocol and architecture which is efficient and yet provides... | 02/20/1990 |
| 4870408 | Method for dynamically allocating data channels on a trunked communication system Disclosed is a method to dynamically allocate a number of data channels on a trunked radio system (100). The data activity is monitored during a predetermined time interval. If activity is above a predetermined maximum, an additional channel may be reserv... | 09/26/1989 |
| 4837858 | Subscriber unit for a trunked voice/data communication system A trunked voice/data subscriber is provided that operates in either a voice mode, or one of three data modes. In a first data mode, the voice/data subscriber monitors the voice control channel to enable rapid participation in a voice call. In a second dat... | 06/06/1989 |
| 4831373 | Method for dynamically allocating data channels on a trunked communication system Disclosed is a method to dynamically allocate a number of data channels on a trunked radio system (100). The data activity is monitored during a predetermined time interval. If activity is above predetermined maximum, an additional channel may be reserved... | 05/16/1989 |
| 4716407 | Trunked communication system true priority channel scan While receiving a lower priority message, a remote transceiver unit in a trunked radio communication system is diverted immediately to a priority channel when a priority message is generated. In a first embodiment, a low speed, sub-audible sync word, tran... | 12/29/1987 |
| 4692945 | Dispatch trunked radio system The present invention contemplates an improved dispatch trunked radio system which provides for individual subscriber to subscriber communication as well other enhanced trunking features. An expanded "dual-word" signalling protocol provides an improvement... | 09/08/1987 |
| 4675863 | Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels A system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber stations may be fixed or movable. The number of time division cir... | 06/23/1987 |
| 4041393 | Vehicle voice data link A communication system operative on a time-shared basis on a single frequency between a plurality of mobile vehicles such as trucks and buses and one or more central base stations and associated dispatcher offices. The communication system provides a data... | 08/09/1977 |
| 4018993 | Telephone system comprising a satellite The invention relates to a telephone system comprising: a satellite arranged to relay a plurality of signalling channels and speech transmission channels; a plurality of earth stations having a plurality of line units each of which is connected to a subsc... | 04/19/1977 |
| 4009346 | Distributional activity compression Modular digital exchange terminals linked in a network by earth satellite provide coordinated multiplex switching and activity compression between line circuits and satellite time division channels. The line circuits carry digital data and digitalized voi... | 02/22/1977 |
