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| Number | Title | Issue Date |
| 4908523 | Electronic circuit with power drain control A power switching circuit is described for supplying power to a radio pager which must be continuously powered from either a main or backup battery. The main battery voltage is monitored and at appropriate levels as its value falls, selected functions of ... | 03/13/1990 |
| 4870402 | Multilingual paging system A communication system and in particular a paging system for transmitting information includes a keyboard, an encoder, a transmitter, a paging, the paging receiver comprising, a decoder, a microprocessor, and a display. Entered information includes a plur... | 09/26/1989 |
| 4868561 | Method of reprogramming an alert pattern A method of selecting an alert pattern for a pager receiver including calling the pager terminal on a telephone, providing a unit ID, a pattern select coded signal and identifying a new alert pattern. The pager terminal then transmits a "replace alert pat... | 09/19/1989 |
| 4868560 | Voice paging system providing deferred paging capability A paging system is provided for transferring information to a paging receiver. The system includes a central controller having a paging controller, an encoder, and a first transmitter. The paging controller receives the information and data designating th... | 09/19/1989 |
| 4868563 | Microcomputer controlled display backlight An apparatus for controlling the illumination of a display used to prevent messages in a pager is described. A microcomputer is used for controlling the operation of the display in response to a read switch being actuated. A light switch, coupled to an il... | 09/19/1989 |
| 4866430 | Low voltage LED driver circuit A low voltage LED driver circuit utilizes a small magnitude inductor in combination with an astable multivibrator to supply sufficient operating voltage to illuminate an LED from a supply voltage source less than the LED's typical operating voltage. By us... | 09/12/1989 |
| 4864276 | Very low-profile motor arrangement for radio pager silent alerting A low-profile motor arrangement for accomodation in a low-volume electronic device such as a radio pager. The motor is designed to provide a vibrating action for silent alerting that does not require any additional add-on parts, but effects the required v... | 09/05/1989 |
| 4862015 | Constant propagation delay current reference A constant propagation delay current reference is provided having an external source providing a reference frequency signal. A phase lock loop is provided which is responsive to the reference frequency signal and to an operating frequency signal to provid... | 08/29/1989 |
| 4862181 | Miniature integral antenna-radio apparatus An integral portable receiver/antenna system is provided which includes an isolation coupler element exhibiting a geometry which is substantially closed upon itself and which is situated between the receiver antenna and the input of the receiver. A portio... | 08/29/1989 |
| 4862516 | System for automatically tuning the antenna of a miniature portable communications device An antenna tuning apparatus for a portable communications device which includes a means of adapting the device to be worn on the body is described. The device consists of an antenna, tuning means and a receiver for receiving transmitted signals including ... | 08/29/1989 |
| 4860003 | Communication system having a packet structure field A communication system develops an information packet having a packet structure field and at least one message. The message has an address and information associated with the address. A central station accumulates and incorporates the at least one message... | 08/22/1989 |
| 4860004 | Digital selective calling receiver having a selectively attachable device for multiple independent address decoding capability A digital selective call receiver is modified to enhance the address decoding capability by providing access to received data, bit and frame synchronization signals, and a detect input terminal of an annunciator. A selectively attachable additional indepe... | 08/22/1989 |
| 4860005 | Communication receiver with automatic turn on/off A communication receiver is disclosed which can turn itself on or off depending upon the time of day. When the receiver is on, normal battery saving is performed. A time of day clock generates a time signal which is compared to predetermined turn on and t... | 08/22/1989 |
| 4856088 | Radio with removable display An electronic device having a display is disclosed which comprises contacts for electrically coupling the display to the circuitry of the electronic device, and a mounting arrangement for removable attachment of the display to the electronic device, such ... | 08/08/1989 |
| 4851829 | Paging receiver with alert indicating status of memory The present invention relates to a paging receiver and a method for generating an alert indicating the status of memory. The paging receiver includes a plurality of memory storage areas, each memory storage storing a received message and including a corre... | 07/25/1989 |
| 4845485 | Combined radio pager/timepiece apparatus with receiver desensitization protection A combined radio pager/analog timepiece that may be worn on the wrist of the user is described. The device includes a stepping motor to periodically advance the second hand of the watch portion. The voltage pulse device signals to the timepiece are effect... | 07/04/1989 |
| 4839628 | Paging receiver having selectively protected regions of memory A paging receiver includes a nonvolatile memory which is readable for controlling the operation of the paging device and is capable of being partitioned into a plurality of regions. A protect means is also included for allowing modification to a selected ... | 06/13/1989 |
| 4835777 | Radio paging receiver including duplicate page detection and error correction capability A digital paging receiver is provided which includes apparatus for determining if an incoming page message is a duplicate of a prior page message already stored in the memory of the receiver. If the current page message is determined to be a duplicate of ... | 05/30/1989 |
| 4828153 | Detachable belt clip assembly A detachable low profile mounting clip arrangement suitable for use with a portable hand-held electronic apparatus such as a paging receiver, includes a housing having a slot. A base member has a hook attached to one end and a pair of apertures at the oth... | 05/09/1989 |
| 4823123 | Knowledge back pager with frequency control apparatus An acknowledge back (ack-back) pager is provide for use in a paging system which includes a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-ba... | 04/18/1989 |
| 4803487 | Portable communications receiver with separate information presentation means A personal message receiving apparatus is described including a portable communications receiver, intended to be carried by the user, which receives, detects and stores messages transmitted on a first radio frequency communication channel. The stored mess... | 02/07/1989 |
| 4802638 | Cord stowage apparatus A cord stowage device is provided which includes a spool having a channel through which a cable slidably passes from one side of the spool to the other side of the spool. First and second cup-shaped members are attached to respective ends of the spool. Ea... | 02/07/1989 |
| 4771405 | Hidden control bits in a control register First and second unused bits of a multi-bit mapped register are utilized to control a desired function. Each of the bits are capable of assuming first and second stable states. The control function is enabled when the first bit is in the first state and t... | 09/13/1988 |
| 4760286 | Comparator with input offset current elimination A comparator circuit for use with other comparator circuits on a common resistive divider chain includes PNP input transistors operating in conjunction with a current mirror circuit, and input circuitry coupled between the divider chain and the PNP transi... | 07/26/1988 |
| 4755793 | Input ranging divider and method for an analog to digital converter An improved input ranging divider and method for an analog to digital converter in which a floating common input line to the A to D comparator is coupled through an R/2R resistive input ladder. A constant reference voltage is applied to the other comparat... | 07/05/1988 |
| 4730127 | Method of matching currents from split collector lateral pnp transistors This relates to a method of generating at least first and second matched currents from first and second multiple collector transistors. The first transistor has a base region, a first emitter region and a plurality of collector regions. The second transis... | 03/08/1988 |
| 4725791 | Circuit utilizing resistors trimmed by metal migration An operational amplifier of the type which includes first and second differentially coupled input transistors which cooperate with a current mirror circuit also includes a first and second RTMM resistors which may be individually trimmed to reduce input o... | 02/16/1988 |
| 4721921 | Amplifier having improved gain/bandwidth product In an operational amplifier having an input stage of the type wherein first and second differentially coupled transistors cooperate with a current mirror circuit, an output transistor is provided having a compensation capacitor coupled between its collect... | 01/26/1988 |
| 4717886 | Operational amplifier utilizing resistors trimmed by metal migration First and second resistors of a resistive network formed in a semiconductive substrate may be individually trimmed. The first and second resistive regions coupled at one end thereof have their other ends provided with metallic contacts. The resistive regi... | 01/05/1988 |
| 4717885 | Operational amplifier utilizing FET followers and feed-forward capacitors An improved field effect transistor follower circuit includes a transistor having equivalent input capacitance Cπ and a field-effect-transistor which has a gate electrode coupled to a source of an input signal, a drain coupled to a source of s... | 01/05/1988 |
| 4717890 | Symmetric layout for quad operational amplifier A quad operational amplifier integrated circuit is constructed such that each of the four cells forms a linear array. Devices which must be critically matched in each cell are symmetrically disposed with respect to the power devices of each cell about the... | 01/05/1988 |
| 4716356 | JFET pinch off voltage proportional reference current generating circuit A circuit for generating a reference current proportional over temperature to the pinch-off voltage of a first JFET includes second and third JFETS and first and second resistors. The second JFET has its gate coupled to its source and produces a current w... | 12/29/1987 |
| 4716379 | Differential amplifier including balanced two terminal series RC network A differential amplifier manufactured in integrated circuit form in a semiconductor substrate includes first and second differentially coupled input transistors. The emitters of the input transistors are coupled to a first source of supply voltage (e.g. V... | 12/29/1987 |
| 4713680 | Series resistive network First and second resistors of a resistive network formed in a semiconductive substrate may be individually trimmed. The first and second resistive regions coupled at one end thereof have their other ends provided with metallic contacts. The resistive regi... | 12/15/1987 |
| 4710728 | Amplifier having improved gain-bandwidth product An amplifier includes an input stage having first and second differentially coupled transistors for receiving a differential input signal and providing a differential output to third and fourth differentially coupled transistors in the second stage. An RC... | 12/01/1987 |
| 4709216 | Operational amplifier with passive current limiting An improved operational amplifier circuit having an all NPN output stage includes a sense resistor in the output stage for developing a voltage thereacross proportional to any short circuit current flowing in the output stage. A diode clamp is coupled to ... | 11/24/1987 |
| 4709171 | Current limiter and method for limiting current A circuit and method for limiting the current through a transistor that is driven from a preceding amplifier stage. The circuit comprises an additional transistor having the base and emitter thereof connected to the base and emitter of the transistor whos... | 11/24/1987 |
| 4689500 | Comparator with substrate injection protection An improved comparator circuit of the type which includes first and second differential PNP transistors operating in conjunction with a current mirror circuit includes an additional dual collector PNP transistor. That is, while the reference voltage is ap... | 08/25/1987 |
| 4683442 | Operational amplifier circuit utilizing resistors trimmed by metal migration A method for trimming a diffused or implanted resistor located within an integrated circuit is disclosed. This technique for trimming a resistor requires the use of high current pulses and geometric shaped metal contacts. The current pulses react with the... | 07/28/1987 |
| 4656460 | D/A converter A D/A/ converter for use in a microprocessor comprises first and second timers (3A, 3B), first and second modulus latches (2A, 2B) associated respectively with said first and second timers for holding respective digital values, the timers being arranged t... | 04/07/1987 |
