| Class 324: ELECTRICITY: MEASURING AND TESTING / U.S. Patent Classification Definitions (11610 words) |
 | Class 324, subclasses 870.01+ take telemetric-signaling means useful in transmitting a measured quantity, not limited to any particular measuring instrument provided for in other classes, while Class 324 takes such telemetric-signaling means in combination with a particular measuring means of the type provided for in Class 324. |
| This subclass is the residual locus of processes and apparatus which automatically perform sequential tests of the Class 324 type, none of which tests are provided for by subclasses preceding this one in the Class 324 schedule. |
| For example, a patent claiming means for automatically testing a circuit for an "open circuit" caused by the failure of a circuit element, followed automatically by a test to determine the input/output characteristics of the circuit is classifiable as an "original" in subclasses 500+. |
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