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| Number | Title | Issue Date |
| 4126849 | Elevator call circuit A call button replacement circuit includes a controllable solid state switch that has a control terminal and a two-terminal output circuit, a manually operated switch, an indicator device, and a capacitor. The solid state switch is connected in circuit be... | 11/21/1978 |
| 4123671 | Integrated driver circuit for display device An integrated driver circuit comprises a signal-generating circuit for sending forth output signals when a power source voltage is impressed thereto; a level converting means for changing the level of one of the output signals into a control signal having... | 10/31/1978 |
| 4122389 | Moisture sensor A soil moisture sensing device employs a pair of indicator lamps to indicate whether the soil is too dry, too wet, or has the correct amount of moisture. The device need employ only one transistor or one Darlington transistor pair to control both indicato... | 10/24/1978 |
| 4086812 | Display device A display device for indicating the value of a measured quantity includes a plurality of display elements, each representative of a primary value range. A driving circuit is responsive to a sensor output signal and activates individual ones of the display... | 05/02/1978 |
| 4032882 | Elevator system An elevator system including an elevator car mounted for movement in a building to serve the floors therein. The elevator system includes control apparatus for selecting the service direction in which the elevator car will proceed from a floor it is servi... | 06/28/1977 |
| 4024491 | Wireless marine navigational aid system A marine navigational aid system in which at least two marine aids, such as lights, are controlled, such as synchronized, relative to each other without the units being connected with an electrical cable. A marine navigational aid system having an underwa... | 05/17/1977 |
| 4024530 | Bacteria identification device A seven-segment display provides a set of eight lamps for each category of a test sample (such as bacteria) to be identified by the device. Manually operated electrical switches are used to enter and store the results of a plurality of tests (such as biol... | 05/17/1977 |
| 4011541 | Single wire system with delay switching circuit for selective control of navigation and strobe lights A system for controlling navigation lights and flashing anti-collision lights in the wing tips of an airplane, including a switch and circuitry constituting means for turning the anti-collision lights on and off from the cockpit of the plane without inter... | 03/08/1977 |
| 4003040 | Flashing address-indicating door sign A flashing door sign comprises a casing having illuminable house numbers at the front thereof. The casing contains red and white light bulbs which are selectively operable by a switch located inside of the house; the switch has positions corresponding to ... | 01/11/1977 |
| 3975724 | Room status signaling system A room status signaling system is disclosed herein employing a plurality of separate signaling circuits employing the internal telephone wiring so that a separate signaling circuit is provided for each room. The plurality of signaling circuits terminate a... | 08/17/1976 |
| 3969720 | Emergency alarm and evacuation system An emergency alarm and evacuation system for directing persons to an emergency exit. The system includes an alarm, a plurality of indicator units arranged in a line toward the emergency exit, and an operating unit coupled to the alarm and being operable i... | 07/13/1976 |
| 3967240 | Directional signal An endless belt incorporating a pair of conductor wires mounts on a pair of spaced pulleys for travel thereabout, in either direction, in response to a motor driving of one of the pulleys. The belt mounts lamps at spaced points therealong which are in cur... | 06/29/1976 |
| 3955185 | Power supply for calculators To avoid useless power consumption in electronic apparatus equipped with display units, for example, such as electronic desk-top calculators with light-emitting diodes, a pair of timer arrangements are provided between the display units and power source t... | 05/04/1976 |
| 3953806 | Displaying amplifier output amplitude A sequence of light emitting diodes are progressively illuminated with progressively increasing instantaneous amplifier output signal amplitude with the last pair of light emitting diodes illuminated simultaneously to indicate amplifier clipping.... | 04/27/1976 |
| 3952978 | Cantilever arm signal assembly A traffic crossing signal mast for railroad-highway grade crossings incorporates a sturdy cantilever arm extending over the highway and supporting a maintenance catwalk. A short, horizontal jury mast at the end of the cantilever arm is pivotable about its... | 04/27/1976 |
| 3947669 | Voting machine An electrical voting machine is disclosed which uses digital circuits to allow each of a number of voters to (1) select one of a number of alternative answers to a question and (2) express a selected degree of confidence in the selected answer, and then c... | 03/30/1976 |
| 3943641 | Audience response system An audience response system includes a console having a plurality of pairs of lamps in which one lamp of each pair is grouped with corresponding ones of the lamps of the other pairs. The system also includes a plurality of switches, each for controlling t... | 03/16/1976 |
| 3944972 | Communication device for assisting the driver of a vehicle A communications device to foster the correct steering of a vehicle by a driver who cannot see where the vehicle is moving with respect to its surroundings, including a control box which is handled by a remote observer, and an indicator panel having at le... | 03/16/1976 |
| 3945003 | Multi-level television receiver channel indicia display A channel number display device for a television receiver for displaying the numerals of the channel to which the receiver is tuned with the display being initially bright immediately after a channel change, and then after a predetermined time of several ... | 03/16/1976 |
| 3942167 | Immersion responsive sensor Apparatus responsive to immersion in water to complete an electrical circuit through which a signalling means is energized from an electrical energy source includes a sensor which is salt or fresh water actuated depending on the sensitivity of the circuit... | 03/02/1976 |
