Method of and apparatus for testing wooden poles
Patent 4350044 Issued on September 21, 1982. Estimated Expiration Date: 
December 17, 2000. 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.
December 17, 2000. 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 3066525 3190111 3345861 3521483 3531983 3600937 3877294 Preliminary screening of wooden poles Reconstruction system and method for ultrasonic imaging Patent #: 4074564 InventorsAssigneeApplicationNo. 06/217330 filed on 12/17/1980US Classes:73/600, For flaw or discontinuity detection73/632Sonic wave transmitter or receiver transducerExaminersPrimary: Gill, James J.Attorney, Agent or FirmInternational ClassesG01N 29/04 (20060101)G01N 29/11 (20060101) G01N 33/46 (20060101) Foreign Application Priority Data1979-12-19 GBAbstractFor testing wooden poles, a transmitter unit including a piezo electric transducer, energized to produce repetitive pulses of ultrasonic frequency, is held against the pole. The transmitter unit produces an audible sound synchronously with each ultrasonic pulse. A portable receiver unit having a probe coupled to a piezo electric transducer is held against the pole. This receiver unit includes a signal level comparator which causes a lamp to flash on for each received ultrasonic pulse above a predetermined amplitude. The receiver is held in a plurality of positions and readings are noted where the lamp flashes synchronously with the audible signal. From these readings the strength remaining in the pole to resist bending forces is calculated. | |
