Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 4485374 | Non-wired perimeter protective system A burglar alarm system of the non-wired perimeter protective type for detecting and indicating break-ins at an entrance or opening, such as a window or door, of a building, employs as a sonic signal generator a transducer that is both triggered and powere... | 11/27/1984 |
| 4481504 | Sound level alarm which ignores transient sounds A sound level alarm device sequentially listens to the sound level of an enclosure or area for a first predetermined interval of time, and thereafter does not listen to the sound level of the area for another predetermined interval of time. The circuit so... | 11/06/1984 |
| 4463348 | Refrigerator door usage monitor and display system A microcomputer based monitor and display system for a refrigerator in which visual indicia are provided to indicate to the user the degree of door usage on a rolling average time basis. Threshold time limits are established to correspond to heavy, normal... | 07/31/1984 |
| 4441102 | Flow sensing apparatus A flow sensing apparatus for providing an indication of the presence of an exiting flow stream from a coal processing plant cyclone includes a probe member disposed in the edge of the flow stream, an electronic sensing circuit cooperatively arranged with ... | 04/03/1984 |
| 4422068 | Intrusion alarm system for preventing actual confrontation with an intruder An intrusion detection system is specifically designed to avoid actual confrontation within a protected premises between a returning occupant and an intruder. The system forewarns a returning owner or occupant, before entering the premises, that an intrus... | 12/20/1983 |
| 4389903 | Indicating system for atmospheric pump arrangement An atmospheric sampling pump arrangement employing a mass flow sensor which electronically monitors mass flow and compares it to a set-point value. The pump is then controlled in a manner that will minimize the difference between the measured flow and the... | 06/28/1983 |
| 4386343 | Acoustic emission intruder alarm system An acoustic emission burglary detection system for detecting physical attacks made on a protected structure such as a vault, safe or the like. Sensors (13, 14) mounted on the protected structure detect acoustic emission stress wave signals produced by an ... | 05/31/1983 |
| 4380760 | Smoke detector with delayed alarm after change to stand-by power The smoke detector is powered by standard AC current and a stand-by power source consisting of rechargeable batteries. A detector is provided for detecting the loss or failure of AC power, and the shift to the stand-by power source. The power loss detecto... | 04/19/1983 |
| 4377808 | Infrared intrusion alarm system An improved dual-sensor infrared intrusion alarm system includes a motion discriminator that renders the system responsive to only radiation-emanating objects that are moving through the system's scope of surveillance. A positive or negative sensor signal... | 03/22/1983 |
| 4335378 | Timed dual comparator alarm A combustion detection apparatus and method is provided for generating an alarm output when either a first alarm condition or a second alarm condition is present. A first alarm output is generated when a first predetermined concentration of combustion pro... | 06/15/1982 |
| 4271402 | Motor vehicle diagnostic and monitoring device having keep alive memory A diagnostic and warning system for a motor vehicle monitors the condition of a number of preselected parameters. When the condition of the parameters is representative of a fault condition, the system energizes a malfunction light in the vehicle compartm... | 06/02/1981 |
| 4265744 | Discharge-controlled method for a compressed air-controlled wet settling machine A discharge-controlled method for a compressed air-controlled wet settling machine for the preparation of mineral mixtures, particularly for the washing of raw coal, is carried out such that the preparation takes place by means of pulsation of a separatin... | 05/05/1981 |
| 4266222 | Electronic postage meter having reset base warning An electronic postal meter includes a unitary structure having a settable printing device, an electronic accounting unit and a control unit preferably having a keyboard. The meter includes a mechanical input for drive by a conventional mechanical meter ba... | 05/05/1981 |
| 4262288 | Electronic disabling switch There is disclosed a monitoring system for monitoring a plurality of functions or stations in a machine and capable of providing an alarm signal in the event of a failure or significant deviation in any one of the functions, which monitoring system also i... | 04/14/1981 |
| 4257063 | Video monitoring system and method A television system and method are disclosed for monitoring and indicating changes in a scene from which electromagnetic radiation, such as visible light, emanates. A television system including a television camera scans the scene in known raster fashion ... | 03/17/1981 |
| 4253094 | Timed alarming using logical inverters A triggered before disarmed alarm system uses CMOS circuitry having a hex-inverter integrated circuit with the output logical inverter coupled to the output transistor by a timing circuit that may be selected through control of the presence and absence of... | 02/24/1981 |
| 4136334 | Timed alarming using logical inverters A triggered before disarmed alarm system especially useful in connection with an automobile alarm uses CMOS circuitry and appropriate supply filtering having one hex-inverter integrated circuit as the only active component beside the output transistor. Di... | 01/23/1979 |
| 4126856 | Scales annunciator An annunciator to indicate the presence of a truck on a weighing platform to a weigh station operator is disclosed. The apparatus includes a presence sensor operable in response to the weight of the truck on the scales. The sensor provides a signal to a d... | 11/21/1978 |
| 4123656 | Storage type smoke detector In a storage type smoke detector which requires a predetermined time after an ionization smoke sensor detects a fire before a fire warning is issued, a charging circuit including a capacitor connected to a power supplying line is coupled with a dischargin... | 10/31/1978 |
| 4121293 | Indication means for indicating suitable conditions for the transfer of loads between two stations movable relative to each other in a vertical plane For use with apparatus for transferring a load between two stations movable relative to each other in a vertical plane by means of a crane carried by one of the two stations having a hook assembly for attachment to the load on the other station for liftin... | 10/17/1978 |
| 4103285 | Vehicle anti-theft alarm system An alarm system for a vehicle or trailer, the system comprising an alarm circuit which is energizable after a predetermined time period responsively to actuation of a control circuit of the system, and switch means for controlling the operating state of t... | 07/25/1978 |
| 4086574 | Fire detection system The present invention is a fire detection system. A timer sets an observation time. This may be accomplished by a first counter or shift register receiving a predetermined number of oscillator pulses. A second counter or shift register counts an alarm pul... | 04/25/1978 |
| 4074246 | Contact system for sensing closures A system for sensing the open or closed position of a closure member such as a window or door includes a first winding having a magnetic core and an audio frequency electromechanical first transducer and electrically interconnected and mounted on the clos... | 02/14/1978 |
| 4064498 | Electrical circuitry for detecting a combustible mixture of gas in a mine atmosphere A pair of sensor assemblies that change in electrical resistance when exposed to a mixture of combustible gas are positioned at a selected location in a mine or on a piece of operating equipment and receive power for continuous operation from a regulated ... | 12/20/1977 |
| 4053876 | Alarm system for warning of unbalance or failure of one or more phases of a multi-phase high-current load An alarm system for warning of unbalance or failure of one or more phases of a multi-phase load circuit which is convenient and practical to use even where the load circuit is drawing a large current and where the flow of power to the load may be controll... | 10/11/1977 |
| 4021796 | Pushbutton purmutation code control means for a security alarm system An activation and deactivation circuit is provided for a security alarm system and includes selector means for selecting a predetermined coded number for enabling and disabling the alarm system. A coded circuit is responsive to the predetermined code from... | 05/03/1977 |
| 4012732 | Security device A security device includes an alarm that is actuated after a predetermined period of no human physical activity, which device includes a clock set to actuate the alarm after a predetermined period of inactivity, an activity sensor that resets the clock wh... | 03/15/1977 |
| 4012730 | Doppler detection device with integrator sampling means to inhibit false alarms A Doppler detector device includes means for transmitting signals into a field to be protected, means for generating a unit step signal from the Doppler shift signal, means for integrating the unit step signal, means for activating an alarm when the outpu... | 03/15/1977 |
| 3999178 | Orientation responsive alarm system Disclosed is a boat alarm system including a sensor that provides a sensor output in response to a predetermined change in its orientation, a timer for providing an alarm signal in response to a one-quarter to one second period of uninterrupted sensor out... | 12/21/1976 |
| 3979739 | Apparatus for the detection of vibration in rotating machinery A transducer generates a signal whose amplitude corresponds to the vibration amplitude of a machine under test. The output of the transducer is passed to a comparator which gives a logic 1 output when the transducer output signal lies outside an acceptabl... | 09/07/1976 |
| 3979740 | Monitoring system A monitoring system for use as an intruder alarm. The system which is designed to reduce the likelihood of generating false alarms, e.g. alarms generated in the absence of an attempt to break in to premises protected by the system but in the presence of s... | 09/07/1976 |
| 3978479 | Solid state security system A security system adapted for monitoring fire, intrusion, and other alarm conditions employs solid state technology to appropriately identify the monitored alarm conditions and initiate appropriate responses. A "one chip" integrated semiconductor circuit ... | 08/31/1976 |
| 3964044 | Multiple operating alarm systems employing oil burner flame monitoring relays An alarm system uses a series string of sensors including burglar, fire and cold detectors in series with a relay coil. The coil when activated, assures that all sensors are indicating a no fault condition and a contact associated with the coil, energizes... | 06/15/1976 |
| 3959789 | Credit card monitor A check or credit card monitor consisting of a plurality of normally closed switches adapted to be held open by insertion of credit cards or similar items between the switch contacts. The contacts are connected in parallel to a timing means adapted to ene... | 05/25/1976 |
| 3944934 | False triggering prevention circuit A falsing protection circuit for preventing the false triggering of an alarm system or the like by extraneous randomly occurring pulses includes a pulse extractor circuit that is nonresponsive to a predetermined number of initial pulses in a pulse train b... | 03/16/1976 |
| 3944970 | Seat belt monitoring system and control device therefor A system for monitoring usage of seat belt means in a motor vehicle includes electrically operable visual signaling means and electrically operable audible signaling means. A first switch is operable in response to initiation of motor vehicle operation fo... | 03/16/1976 |
| 3934237 | Alarm device An alarm device comprising a first program mechanism at a monitored station and a second program mechanism at a central monitoring station. The program mechanisms have identical shift registers and identical feedback networks and generate binary signals a... | 01/20/1976 |
