Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 5128665 | Selective call signalling system A paging system has a signal for transmitting a variable amount of messages to paging receivers. The signal has a synchronization signal, an address field, an information and a boundary signal indicative of the boundary between the address field and the i... | 07/07/1992 |
| 5121503 | Satellite signaling system having a signal beam with a variable beam area This invention relates to a satellite signalling system, such as a satellite paging system, having signal coverage over a very wide area. The satellite signalling system comprises a satellite to which is coupled an antenna for providing a signal beam havi... | 06/09/1992 |
| 5113092 | Differential voltage comparator A differential voltage comparator circuit comprises a differential pair (802 and 804) electrically coupled to a biasing network (806) and a loading network (808). The differential pair circuit comprises a first (802) and a second (804) controllable electr... | 05/12/1992 |
| 5109176 | Mounting for multiple crystal filter blanks Two or more crystal filter blanks are mounted together in such a manner so as to minimize the printed circuit board surface area occupied by their aggregate footprint and to minimize the vibratory and oscillatory interference among the cyrstal filters. Mo... | 04/28/1992 |
| 5109220 | Selective call controller A selective call controller, such as a paging terminal, and a method therefor is provided for receiving calls comprising first and second types of signal, such as numeric/alphanumeric or modem/DTMF. A determination is made of the type of signal being rece... | 04/28/1992 |
| 5089814 | Automatic time zone adjustment of portable receiver A portable receiver has a time of day clock and receives a signal indicative of the location of the portable receiver. The portable receiver has a memory which has a plurality of locations with corresponding time zones. Upon reception of the location sign... | 02/18/1992 |
| 5089813 | Method of super battery saving in a selective call receiver A paging receiver receives a message signal having an address field and a data field. The message has at least one address within the address field and a plurality of packets in the data field. The data packets contain a predetermined amount of informatio... | 02/18/1992 |
| 5077514 | Battery charging apparatus and method An apparatus (112) for charging a plurality of batteries, having at least one aperture (300) capable of receiving a plurality of batteries therethrough, and including at least two slots (110I and 110I+1) for accommodating the plurali... | 12/31/1991 |
| 5075684 | Selective call message management Messages received by a selective call receiver are stored in source files with a user allocated number of message storage slots in response to a message source signal indicating the source of the message. Messages are retrieved utilizing the source files ... | 12/24/1991 |
| 5073767 | Selective call receiver theft protection device A selective call receiver allows reprogramming of the options stored within a code plug only after entry of a correct password. After a predetermined number of unsuccessful attempts to enter a correct password, the selective call receiver is user disabled... | 12/17/1991 |
| 5058204 | Synthesized selective call receiver having variable characteristics A paging receiver has a synthesizer for governing the receive frequency. The paging receiving further has characteristics which are varied in response to the receive frequency. These characteristics include varying the bandwidth of a loop filter within a ... | 10/15/1991 |
| 5054113 | Communication system with bit sampling method in portable receiver for simulcast communication Receivers synchronize to signals sequentially transmitted from several transmitters prior to receiving signals simulcast by the transmitters. The relative delay differential of the received sequential signals is measured and used to determine the optimal ... | 10/01/1991 |
| 5051993 | Mixed modulation level communication system A communication system has an information signal having a plurality of data streams. The data streams are simultaneously modulated on a multi-level symbol transmission. The data streams may have either independent or dependent signalling protocols. A tran... | 09/24/1991 |
| 5049875 | Method and apparatus for out of range detection in response to nondetection of predetermined baud rates A baud rate detector determines the baud rates of signals received by a selective call receiver. If the signals have no detectable baud rate or the baud rate of the received signals does not match that of a plurality of known selective call network transm... | 09/17/1991 |
| 5047763 | Selective call system with message rebroadcasting over another selective call system A method and apparatus selectively rebroadcasts information received from a first selective call network system by a second selective call network system. A selective call receiver monitors the messages broadcast by the first selective call network system... | 09/10/1991 |
| 5048118 | Combination dual loop antenna and bezel with detachable lens cap An electronic device includes a printed circuit board for mounting electronic components thereon. An antenna, such as a dual loop antenna, is secured to the printed circuit board and acts as a bezel to mount a display, such as a liquid crystal display, on... | 09/10/1991 |
| 5032835 | Out of range indication for radio receivers A pager (1) includes switches (12,13,14,15) for setting the priority of a message expected to be received at a predetermined time on a substantially continuous carrier signal. A receiver (3) is then activated for a period of time determined by the priorit... | 07/16/1991 |
| 5018837 | Enhanced contrast liquid crystal display device Known LCD devices of the type having an upper polarizer (36), a liquid crystal cell (28), a lower polarizer (38) and a reflector (42) and working using ambient light to provide illumination lose contrast because the light passes twice through both polariz... | 05/28/1991 |
| 5012219 | Message reminder alert for selective call receiver A selective call receiver includes a message reminder alert controlled by a reminder switch and independent of the receipt of subsequent messages.... | 04/30/1991 |
| 4996526 | Power conservation method and apparatus for a portion of a synchronous information signal A receiver receives a transmitted digital signal having a synchronization signal and information signals. The receiver synchronizes to the synchronization signal and detects predetermined signals within the information signals. When it is determined that ... | 02/26/1991 |
| 4991187 | High speed prescaler An apparatus is described for the dual modulus prescaling of a high frequency signal. The apparatus comprises a dual modulus divider, second divider, synchronization circuit for providing a first modulus control signal to the dual modulus divider, and mea... | 02/05/1991 |
| 4982141 | Driver circuit for piezoelectric transducer and electroluminescent lamp A driving circuit including a single transformer drives a piezoelectric transducer and an electroluminescent lamp. The circuit is coupled to the driving circuit for limiting the peak current through the transformer.... | 01/01/1991 |
| 4972510 | Method and apparatus for squelching dependent on detected bond rate to reduce unwanted audible noise on a mixed voice data channel Unwanted audible noise on a mixed voice data channel is reduced by disabling an audio output device in a radio receiver or transceiver when the receiver determines that the RF signal received contains binary digital bit data. Alternatively, the receiver e... | 11/20/1990 |
