High frequency reaction mass and hydraulic cylinder assembly
Patent 4506758 Issued on March 26, 1985. Estimated Expiration Date: 
August 13, 2004. 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 13, 2004. 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 3143181 3745885 Hydraulic vibrator Broadband seismic energy source Patent #: 4253538 InventorApplicationNo. 06/640216 filed on 08/13/1984US Classes:181/119, Fluid means181/121, Moving weight367/189, Vibrator-type transmitter73/665Having fluid bearing or fluid pressure actuatedExaminersPrimary: Moskowitz, NelsonAttorney, Agent or FirmInternational ClassesG01V 1/02 (20060101)G01V 1/155 (20060101) B06B 1/18 (20060101) AbstractA reaction mass and hydraulic cylinder assembly for a seismic transducer. A hydraulic biasing cylinder (76) is formed between a lower piston rod (32) and a reaction mass (44) and is located below a hydraulic drive cylinder (46). The lower piston rod (32) includes a first portion (36) and a detachable second portion (38-40), the detachable second portion forming an upward facing shoulder (42) which partially defines the hydraulic biasing cylinder (76). The hydraulic drive cylinder (46) is formed by a cylinder sleeve (48) and upper and lower cylinder bushings (50 and 52) having lower and upper ends (54 and 56), respectively, concentrically received within the cylinder sleeve (48) to define the upper and lower ends, respectively, of the hydraulic drive cylinder. | |
