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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 5303395 | Power control with a constant gain amplifier for portable radio transceivers A system for controlling the power level of RF signals output by a portable radio transmitter having a first voltage supply, a first amplifier stage and a microcomputer coupled to the first amplifier stage for selecting one of a set of power levels. An in... | 04/12/1994 |
| 5287554 | Portable radio communication equipment In a portable radio equipment, a first power unit (11) and a second power unit (15) can be selectively mounted to or removed from a radio equipment main unit (1). The main unit contains a transmit audio circuit (3), a first microphone (4), and a power cir... | 02/15/1994 |
| 5276917 | Transmitter switch-on in a dual-mode mobile phone A method for providing a positive transmitter power switch-on in a dual-mode mobile phone is disclosed. According to the invention the transmitter is switched on in two or more phases, controlled by the mobile phone microprocessor program. Preferably the ... | 01/04/1994 |
| 5251329 | Radio telephone apparatus with microphone mounted in battery case A radio telephone apparatus for transmitting and receiving information signals as electrical waves includes a main body section towards one end of which a speaker unit is enclosed. A battery casing accommodating a battery which is adapted for supplying po... | 10/05/1993 |
| 5248569 | Battery door having integrated locking mechanism A housing assembly (100) for enclosing a battery (108) and electrical circuitry (107) comprises a housing element (105) formed to enclose the battery (108) and the electrical circuitry (107) and a battery door (110) for providing access to the battery (10... | 09/28/1993 |
| 5244755 | Battery compartment door and latch having longitudinal snaps A housing (202, 602) for an electronic device (700) comprises a battery compartment door (604) having a one-piece molded latch (100). The latch (100) comprises a slide member (102) coupled to a snap member (104) formed substantially in the shape of a U. T... | 09/14/1993 |
| 5241582 | Control for supplying power to car audio and phone systems A delay and inverting circuit, connected to the car phone system, is for delaying a status of operation of the car phone system and inverting a signal having a predetermined signal level according to the operation of the car phone system. A switching circ... | 08/31/1993 |
| 5239695 | Radio-frequency power control circuit of mobile radiophone Radio-frequency (RF) power control circuit that facilitates establishment of RF power levels of the mobile radiophone, is disclosed. The circuit maintains constant RF power levels even if the variable resistor is displaced by vibrations and impacts caused... | 08/24/1993 |
| 5212836 | Power source control circuitry for an automotive portable telephone Power source control circuitry for an automotive portable radio telephone which is powered by a power source mounted on a motor vehicle via an adapter. When the telephone is mounted on the adapter, power is fed from the on-board power source to the adapte... | 05/18/1993 |
| 5212811 | Radio telephone in which an off operation of an operator-activated power switch is inhibited during a talk mode A radio telephone apparatus, such as a car telephone, and the method of controlling a radio telephone apparatus, in which the OFF operation of a power source switch caused by an erroneous operation is inhibited when the radio telephone is in a talk mode. ... | 05/18/1993 |
| 5170494 | Two piece radio telephone According to the invention, the power and weight of a radio telephone can be modified by connecting the same basic unit (1) a desired power unit (2 or 4). The signals received and transmitted between the units (1 and 2 or 4) pass apart from each other.... | 12/08/1992 |
| 5170491 | Power source switch circuit A power supply control circuit for use in an automobile telephone to which power is supplied in response to a power switch signal and to an ignition voltage. The power switch signal is generated by a power switch in a handset of the telephone. The ignitio... | 12/08/1992 |
| 5164652 | Method and apparatus for determining battery type and modifying operating characteristics A battery type detector for battery-using and battery-charging equipment is disclosed. Operational characteristics of the using and charging equipment are modified in accordance with the battery type detected.... | 11/17/1992 |
| 5155860 | Cellular portable telephone battery pack and programmer interface An apparatus that includes various connectors, a battery compartment, and a circuit card is disclosed. The apparatus serves as a battery pack and programmer interface unit (BP/PIU) which mates with a cellular portable telephone (CPT) transceiver to form a... | 10/13/1992 |
| 5136229 | Power pack device A power pack unit is provided for utilization with battery-operated devices employing rechargeable batteries. The power pack unit specifically is designed for utilization with hand-held, portable cellular telephones having a removable, rechargeable batter... | 08/04/1992 |
| 5126688 | Power amplifying apparatus for wireless transmitter A power amplifying apparatus according to the present invention can provide a stable electric power output with wide range by controlling both of the output amplifier for amplifying the electric power and the pre-amplifier disposed at the front of the out... | 06/30/1992 |
| 5095541 | Radio telephone apparatus A portable telephone apparatus which is capable of being selectively connected to an adaptor unit for transmitting a radio frequency (RF) signal at a certain power level in response to a level control signal. The telephone apparatus includes an amplifier ... | 03/10/1992 |
| 5054115 | Radio telephone apparatus A radio telephone apparatus including a portable radio device capable of being mounted on and carried out from a vehicle such as an automobile in use. The portable radio device has a transmission-reception antenna accommodatable therein and is connected v... | 10/01/1991 |
| 5046131 | Portable radio transceiver apparatus A radio transceiver apparatus is provided which includes (1) a radio transceiver carrying a removable battery pack which is charged when the radio transceiver is set on a holder including a charger, and (2) an adapter carrying an auxiliary battery pack, i... | 09/03/1991 |
| 5036532 | Portable telephone with power source/mode change during calls A unique cellular portable telephone (100) automatically accommodates a power source change during a cellular telephone call between the portable's battery (300) and another battery or an external power source from vehicular adaptor (200), such as, for ex... | 07/30/1991 |
| 4995072 | Self-powered base and remote telephone communication set A cordless remote telephone unit communicates with a telephone line through a stationary self-powered base unit. The base unit is not plugged into an electrical household receptacle and is therefore completely portable to any location having a telephone j... | 02/19/1991 |
| 4974250 | Adapter for mounting a portable telephone on a vehicle An adapter for mounting a portable telephone on a vehicle allows either one of a simple handset and a multi-function handset to be used therewith as desired. The adapter does not need a power switch and associated circuitry and, therefore, reduces the ove... | 11/27/1990 |
| 4969206 | Portable data collection device with RF transmission A portable data collection device having RF communication capabilities. This device contains circuit boards arranged in such a manner to shield the CPU board from the RF transmission components. The power source of the device is a battery pack designed to... | 11/06/1990 |
| 4962523 | Radio telephone set used as portable set and vehicle-mounted set A radio telephone set comprises switch circuitry, a telephone circuit and a battery for portable operation, which battery may be a built-in battery. When the radio telephone set is not mounted on a vehicle, the switch circuitry is not connected to a batte... | 10/09/1990 |
| 4933963 | Radio telephone apparatus A radio telephone apparatus power-supplied with a battery comprises a power supply control means for controlling the battery so as to terminate power supply if the apparatus is not operated for a predetermined time period. The apparatus further comprises ... | 06/12/1990 |
| 4908846 | Mobile telephone terminal having function to perform call clear process A mobile telephone terminal includes a portable-unit and an adaptor which is capable of mounting the portable-unit on a vehicle and supplying power from a vehicle battery to the portable-unit. The adapter includes a power switch manually generating a swit... | 03/13/1990 |
| 4903326 | Detachable battery pack with a built-in broadband antenna A detachable battery pack with a built-in broadband antenna is disclosed. Since the antenna is wholly contained within the battery housing, it is protected from damage and is detachable from the transceiver when the battery is detached. A transmission lin... | 02/20/1990 |
| 4893348 | Power source control device in car telephone mobile station system A power source control device in a car telephone mobile station system where an abnormal state detecting means installed within a body CPU supervises signals transmitted from a hand set CPU, and if abnormal state of the signal from the hand set CPU occurs... | 01/09/1990 |
| 4873712 | Telephone controlled interrupter circuit A control unit is inserted in the power lines that serve a vehicular telephone and an audio system. A power monitoring circuit detects current increases related to operation of the telephone, either from an incoming "ring" signal or the "off hook" conditi... | 10/10/1989 |
| 4868862 | Automobile telephone unit An automobile telephone unit (T) has a main body (11) located in a prescribed position in the cabin of an automobile, a telephone number dialing device (D) electrically connected to the main body (11), and a handset (12) electrically connected to the main... | 09/19/1989 |
| 4845772 | Portable radiotelephone with control switch disabling A portable radiotelephone with control switch disabling is disclosed. A flip element which contains a microphone and covers a keypad and other control buttons when in a closed position also activates a hookswitch. When the hookswitch and microprocessor in... | 07/04/1989 |
| 4792986 | Portable radio system with externally programmable universal device connector A computer-controlled portable radio communications device has RF and audio circuits controlled by a programmed computer in accordance with a predetermined modus operandi and includes an externally accessible multi-point electrical connector having input/... | 12/20/1988 |
| 4723265 | Abreviated dialer with reduced key operations A microprocessor-based telephone set includes a telephone number memory, a number indicator, an abbreviated number selecting switch, an abbreviated number controller, and a selecting signal controller. The call is made when a selecting signal is sent to a... | 02/02/1988 |
| 4647722 | Land mobile telephone system The present invention relates to a land mobile telephone system with enhanced operability realizing both the loud-speech and closed-speech operations by the single handset. The handset is installed detachably in a pad of a steering wheel of an automobile ... | 03/03/1987 |
| 4593409 | Transceiver protection arrangement A warning and protection circuit arrangement suitable for use in conjunction with a two-way portable transceiver having a removable battery pack/antenna includes a battery enclosure containing an antenna structure. A circuit is enclosed inside the battery... | 06/03/1986 |
| 4585903 | Cordless telephone A cordless telephone system which provides improved performance through a number of moved circuits including the use of a single oscillator in a remote unit for providing both a standard for the transmitted signal and a local oscillator signal. The remote... | 04/29/1986 |
| 4558177 | Regulated output current source for cordless telephones A circuit for providing a constant current to an output stage of a cordless telephone transmitter using AC power lines as a transmission medium to maintain the RF component on the AC lines to within regulated limits. The RF component is sensed to provide ... | 12/10/1985 |
| 4509201 | Wireless telephone apparatus with protection against power loss Two limit voltages are established for a wireless telephone apparatus. If the power supply voltage exceeds the first limit voltage, the transmitter of the wireless telephone apparatus is prevented from radiating signals. At the same time, the central proc... | 04/02/1985 |
| 4363935 | Mobile radio telephone system A vehicle radio telephone system includes, in addition to a handset associated with a telephone set, a wireless microphone detachable from the telephone set and a telephone receiver comprising a speaker contained in the telephone set. When a driver drives... | 12/14/1982 |
| 4221932 | Infrared remote signaling system A hands-free telephone system is disclosed utilizing an infrared transmitter and receiver to permit wireless speech transmission. The transmitter uses frequency modulation imposed on the infrared signal and includes carrier shift signaling arrangements fo... | 09/09/1980 |
