The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 2004
Filed:
Feb. 10, 2003
Michael Kenneth Andrews, Wellington, NZ;
Paul David Harris, Wellington, NZ;
Peter Charles Stratton Carter, Rotorua, NZ;
Brian Andrew Rawley, Tokoroa, NZ;
Marcus Jean Francois Lausberg, Rotorua, NZ;
Carter Holt Harvey Limited, Manukau, NZ;
Abstract
Use of a single end testing of stems of felled trees whereby by inducing a sonic wave with an impact and by reference to detected reflections and with a knowledge of the length of the stem the stiffness and/or strength characteristics of the stem or logs to be cut therefrom can be derived. A preferred procedure is a determination of the fundamental frequency f which relates to velocity V, the speed of longitudinal compressional motions along the stem, and L, the length of the stem, as follows: V=2Lf . From that value V or a function of V can be derived an indicator of stiffness and/or strength.