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"Everyone acquainted with the subject will recognize it as a conspicuous failure."
Henry Morton, president of the Stevens Institute of Technology ; Said in 1880 about the light bulb
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| Number | Title | Issue Date |
| 3991553 | Low voltage battery indicator for a solid state watch Disclosed is a solid state wristwatch having a digital light emitting diode display and a low battery voltage circuit for actuating the display to indicate the approach of battery failure. The battery voltage sensing circuit draws power only when the disp... | 11/16/1976 |
| 3986498 | Remote ECG monitoring system A remote ECG monitoring and telemetry system for use in a hospital equipped with a master antenna television cable system comprising a portable patient sensor/transmitter unit for deriving ECG information and for transmitting a first frequency signal modu... | 10/19/1976 |
| 3979657 | Battery monitor with automatic scale and recycle prevents A monitor for disabling a selected operative function of the battery powered vehicle when the battery reaches a predetermined discharge state is disclosed. The discharge state of the battery is determined by continuously monitoring the terminal voltage of... | 09/07/1976 |
| 3974441 | Battery checker Disclosed is a device for checking the energy level of a battery, or battery pack, of the type used in the powering of transmitters, receivers and servos used in powered model airplanes, boats, cars, etc. The circuit connects a silicon controlled rectifie... | 08/10/1976 |
| 3970933 | Device for checking a D.C. source voltage relative to a predetermined value A device for testing the voltage of a voltage source comprises a bridge circuit, a differential switching circuit and an indicator element. The bridge circuit includes a first circuit comprising a first resistor; a second circuit comprising first diode me... | 07/20/1976 |
| 3969697 | Voltage drop warning apparatus with negative-resistance device A series connection comprising a transistor (4) and a light-emitting diode (3) is connected across a D.C. power source (+Vcc), and one end of a negative-resistance device (1) is connected to the base of said transistor (4) and the other end thereof is con... | 07/13/1976 |
| 3967133 | Power supply means A power source particularly for use in remote locations which can be operated off of conventional sources of power such as off a battery source, said power source including means for distinguishing between different voltages and including means to indicat... | 06/29/1976 |
| 3956720 | Storage battery analyzer An instrument for measuring and testing wet cell storage battery charge levels including the total charge level and the charge level of individual cells. The instrument has an autopolarity feature and utilizes a diode rectifier circuit with a DC voltmeter... | 05/11/1976 |
| 3949545 | Quartz crystal timepiece A battery-powered quartz crystal timepiece is provided with a battery voltage detecting circuit utilizing the threshold voltage of a field effect transistor as a battery failure indicator. The voltage level at which failure is indicated may be selectively... | 04/13/1976 |
| 3940679 | Nickel-cadmium battery monitor The nickel-cadmium battery monitor is provided with sensors for measuring the battery temperature, the battery voltage and the magnitude of the current being charged to the battery, each of the sensors generating a sensor signal voltage that varies direct... | 02/24/1976 |
| 3939421 | Circuit for indicating the battery voltage and operation of a radio transmitter A single indicator lamp is provided on a personal or portable, battery powered radio transmitter to indicate when the transmitter is operated. The lamp is connected to a circuit which senses the battery voltage (and hence charge), which causes the lamp to... | 02/17/1976 |
| 3936121 | Jumper cables for sparkling polarity indicator Jumper cables or battery charging cables for automotive use and the like are disclosed in which at least one of the cable's gripper jaws or clamps is provided with a length of coiled heater-resistance wire. The length of wire is clamped to the portion of ... | 02/03/1976 |
| 3934188 | Self-testing battery discharge indicator The voltage of a battery connected to a load is monitored to provide a continuous instantaneous indication of the voltage level of the battery and to provide an indication that the battery voltage has fallen to some critical level. Means are provided for ... | 01/20/1976 |
| 3932797 | Self-testing battery discharge indicator The voltage of a battery connected to a load is automatically indicated with respect to two voltage levels. A first indicating means indicates that the battery voltage is greater than a first voltage level, and a second indicating means indicates that the... | 01/13/1976 |
| 3932853 | Apparatus for warning of the failure of a sump pump Apparatus for warning of the failure of a sump pump comprising an electrical alarm connected in an electric circuit, a switch for closing the circuit to activate the alarm, and a movable float positioned in the sump for actuating the switch when the water... | 01/13/1976 |
