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| Number | Title | Issue Date |
| 7228186 | Field-mounted process device with programmable digital/analog interface Embodiments of the present invention generally provide a field-mountable process device that receives digital information from one or more process devices, and provides an associated analog output. Embodiments of the present invention include providing a wireless in... | 06/05/2007 |
| 7016741 | Process control loop signal converter A device for use in a process control system includes a first pair of electrical connections configured to couple to a two-wire process control loop. The loop includes a two-wire process variable transmitter. A second pair of electrical connections is configured to ... | 03/21/2006 |
| 6961624 | Two-wire field-mounted process device A two-wire field-mounted process device with multiple isolated channels includes a channel that can be an input channel or an output channel. The given input or output channel can couple to multiple sensors or actuators, respectively. The process device is wholly po... | 11/01/2005 |
| 6472827 | Parallel-resonant inverter-type fluorescent lamp ballast A push-pull inverter is supplied from an inductively current-limited DC voltage source by way of a center-tap on a transformer having significant inductance. This transformer inductance is parallel-coupled with a capacitance means. The inverter is made to... | 10/29/2002 |
| 5465010 | Electrical [arrangement] distribution system for vehicle An electrical arrangement is disclosed for use in supplying electrical power to the units in a motor vehicle. The arrangement comprises a battery, and an inverter to receive power from the battery and to generate a high frequency signal at an intermediate... | 11/07/1995 |
| 5363035 | Phase controlled transformer An operator controllable transformer having a shunt magnetic path with a control coil is provided. The transformer includes phase control circuitry to control the output of the transformer by phase controlling current flow in the shunt coil, thereby contr... | 11/08/1994 |
| 5187428 | Shunt coil controlled transformer A transformer having a shunt magnetic path and a shunt coil is provided. The transformer includes control circuitry to control the output of the transformer by controlling current flow in the shunt coil, thereby controlling the flux through the shunt magn... | 02/16/1993 |
| 4652776 | Circuit using a multi-path magnetic core with common output limb An AND function gating circuit for A.C. signals comprising several magnetic circuits around a common limb, each circuit having a separate input winding and a single output winding on the common limb. The magnetic flux level in the common limb is greatly i... | 03/24/1987 |
| 4600872 | Apparatus for variable speed drive of an induction motor from a fixed frequency AC source A control system for driving a variable speed AC motor employing a fixed frequency AC power source, combines pulses representative of a desired slip frequency with pulses of a frequency proportional to the speed of the motor. The combined pulses are emplo... | 07/15/1986 |
| 4558271 | Power inductive couplers A two-part separable inductive coupler is provided in one part with a current-limiting reactor whose control winding is energized by control means in response to the formation of a magnetic circuit between primary and secondary windings incorporated in sa... | 12/10/1985 |
| 4346340 | Method and means for controlling the flux density in the core of an inductor In a method for the enhancement of the A.C. performance of an inductor such as a transformer or choke, the tendency of the core of the inductor to become saturated by flux arising from low frequency A.C. or D.C. currents flowing in the inductor winding is... | 08/24/1982 |
| 4243931 | Current isolator A current isolator circuit generates an electrically isolated output current which is related to an input current. The current isolator includes a magnetically saturable transformer having a core and first, second, and third windings. The input current fl... | 01/06/1981 |
| 3936721 | Electrical power supplies An electrical power supply arranged to provide an alternating voltage output, which includes a pair of transductors or saturable reactors connected in phase opposition in series to the output and provided with means for supplying them with a constant d.c.... | 02/03/1976 |
