Slide valve position indicator and magnetic coupler
Patent 4743170 Issued on May 10, 1988. Estimated Expiration Date: 
September 3, 2007. 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.
September 3, 2007. 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 ReferencesMicro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current Simplified unloader indicator for helical screw rotary compressor Control means for gas compressor having dual slide valves Patent #: 4610613 InventorApplicationNo. 07/092827 filed on 09/03/1987US Classes:417/310, Rotary expansible chamber pump411/282, Defining a smooth curving, noncircular thread section (e.g., elliptically shaped)62/131Position or extent of motion of movable elementExaminersPrimary: Freeh, William L.Attorney, Agent or FirmInternational ClassesH02K 7/06 (20060101)H02K 49/00 (20060101) H02K 49/10 (20060101) AbstractMovement in a pressurized environment is transmitted to a non-pressurized environment by means of a strong magnetic coupling whereby linear movement of a magnet in a pressurized environment causes linear movement of a surrounding magnet which is in a non-pressurized environment. Because of the strong magnetic coupling, the surrounding magnet is used to drive a linear to rotary motion converter. In the preferred embodiment, the pressurized environment is within a screw compressor. | |
