(under subclass 89) Subject matter including a circuit for eliminating unwanted components of a signal from the focusing
or rangefinding means (e.g., spatial filtering, frequency filtering, etc.).
SEE OR SEARCH CLASS
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
551+, for unwanted signal suppression using electrical nonlinear devices.
333, Wave Transmission Lines and Networks,
166, and 167+, for time domain or frequency domain filters.
364, Electrical Computer and Data Processing Systems, for filtering in measuring, testing, or monitoring. 702, Data Processing: Measuring, Calibrating, or Testing,
190+, for signal extraction or separation (e.g., filtering).
708, Electrical Computers: Arithmetic Processing and Calculating,
300+, and 819 for digital and analog filters, respectively.
