Electropneumatic positioner
Patent 5257639 Issued on November 2, 1993. Estimated Expiration Date: 
August 24, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 24, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3332045 3441053 3485256 3492760 3772540 3794868 3918016 Electrodynamically controllable pivoting mirror device Multiple-mode fluid-flow control valve arrangement Nozzle force feedback for pilot stage flapper InventorsAssigneeApplicationNo. 934787 filed on 08/24/1992US Classes:137/82, PRESSURE MODULATING RELAYS OR FOLLOWERS137/84, Plural series units251/65, PERMANENT OR CONSTANTLY ENERGIZED MAGNET ACTUATOR251/129.08, Having means to produce proportional flow335/229With permanent magnetExaminersPrimary: Michalsky, Gerald A.Attorney, Agent or FirmForeign Patent References
International ClassesG05D 007/06F16K 031/08 AbstractA transducer having an explosion-proof housing with a divider forming two compartments, and the divider having formed therein a well. A magnet and flapper arm arrangement is suspended within the well. A coil winding is fixed in the other compartment around the well so that a magnetic field generated thereby influences the pivotal position of the magnet. Set screws adjustable in the bottom of the well are effective to preset a rest position of the magnet.Other References
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