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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7579707 | Discharge prevention circuit and electronic equipment provided with the discharge prevention circuit A discharge prevention circuit and electronic equipment with the discharge prevention circuit are provided. The discharging prevention circuit includes a first power line, a second power line, a capacitor, a current detector and a switch. The first and second power ... | 08/25/2009 |
| 7274974 | Independent automatic shedding branch circuit breaker An independent automatic shedding system that automatically allows any combination of loads to powered under limited power availability (such as a standby power source) without overloading the generator or rewiring, while contributing to the stability of the power g... | 09/25/2007 |
| 7142950 | Methods and apparatus for providing and distributing standby power Aspects of the invention are directed to power distribution systems and methods for distributing power from a primary power source and a backup power source to a load. In one particular aspect, a power distribution system includes a first input to receive input powe... | 11/28/2006 |
| 6657416 | Control system for stand-by electrical generator A generator structure is provided for generating an AC power for a load. The generator structure includes a generator connectable to a load and an engine operatively connected to the generator for driving the same. A generator controller is operatively co... | 12/02/2003 |
| 6604055 | System and method for AC line voltage analysis A system and method for AC line voltage analysis is disclosed. According to one embodiment of the present invention, a system for AC line voltage analysis on an AC line includes a transformer that steps down the AC line voltage, a rectifier that rectifies... | 08/05/2003 |
| 6601002 | Arrangements to detect and respond to disturbances in electrical power systems A control arrangement and method is provided for detecting and responding to disturbances in electrical power systems. In a preferred arrangement, an integration is initiated that is based on a comparison of actual voltage of a source and a reference volt... | 07/29/2003 |
| 6466627 | Pulse signal transmitting circuit and subscriber's line terminal apparatus using the pulse signal transmitting circuit A pulse signal transmitting circuit generates a pulse signal having an enhanced high-frequency component with a reduced power loss. A pulse signal is transmitted to a load circuit through a transmission cable connected to a secondary winding of a transfor... | 10/15/2002 |
| 4652771 | Oscillating flux transformer An oscillating flux transformer for transforming relatively large blocks of electrical power at power frequencies in direct accordance with the turn ratio of toroidal primary and secondary windings. The transformer includes a core-coil assembly having a p... | 03/24/1987 |
| 4194128 | Ripple control systems A three phase ripple control system for feeding a control signal onto each phase line employs an injection transformer having a primary winding and three secondary windings. A control signal generator is connected in circuit with the primary winding and s... | 03/18/1980 |
