(under subclass 200) Subject matter which includes apparatus to note the strain within material having means to form a magnetic field in which the material is placed, or means to form a magnetic field in the material, the apparatus to sense a magnetic field and indicate the sensing of the magnetic field senses the magnetic field modified by the material or the field produced in the material and indicates the result of the test, the indication being a measure of the strain in the material as a result of some type of force imparted to or within the material.
(1) Note. The means to impart the force to the material may or may not be claimed.
(2) Note. Compressional, tensional, shear, or torsional
physical force is used to impart strain to the material.
(3) Note. The material tested can be examined for residual strain after the applied force is removed from the material, or the material can be examined for strain resulting from the applied force.
(4) Note. Excluded are claims to sense the internal strain of a magnetic sensor which is an indication of the force applied to the sensor and torque or torsion sensing devices relying on magnetic characteristics.
(5) Note. Claims testing the magnetostrictive effect of material are classifiable here.
SEE OR SEARCH CLASS 73, Measuring and Testing,
136+, and 141+ for sensing the internal strain of a magnetic sensor which is an indication of the force applied to the sensor and torque or torsion sensing devices relying on magnetic characteristics; subclass 779 for stress or strain measuring system having an inductive or magnetic sensor mechanically coupled to the specimen and subclasses 862+ for dynamometers including subclasses 862.381+ for the measurement of force by magnetic load cells.
356, Optics: Measuring and Testing,
32+, for material strain analysis of material by visible light.
