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Class Definition for Class 331 - OSCILLATORS (4602 words) |
 | appropriate subclasses, for oscillator systems similar to those classified in this class (331), but wherein no means for deriving a useful output from the system is claimed. |
| Some of the systems for converting direct current to alternating current (e.g., derectifiers, inverters) in Class 363 are indistinguishable from the oscillators in Class 331. |
| The distinction appears to be one of degree, that is, the inverters classified in Class 363 usually are designed to convert direct current power to alternating current power at commercial power frequency (e.g., 25, 50, or 60 cycles per second). |
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