(under the class definition) Subject matter including a transmission line producing inductive or radiation interference or subject to such interference from an external source and means such as one or more filters, screens or compensating circuits, disposed along an appreciable length of the line for substantially reducing this interference.
(1) Note. Subclass 12 does not include mere echo or anti-singing systems. Such systems in a single channel system where classified in this class are classified with the first occurring (lowest numbered) subclass providing for any of the components used in the system. For echo-suppressing and/or anti-singing systems in plural channel systems, see subclasses 406+ of Class 379, Telephonic Communications.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5, for plural channel systems, which are balanced to prevent undesired radiation effects.
24+, for networks which may be used to reduce undesired currents in a transmission line, and particularly subclasses 138+ for balanced circuits coupled to unbalanced circuits and subclasses 165+ for wave filters and for transmission lines connected to filters which block such undesired currents.
236+, for long line transmission line structure which inherently reduce interference radiation effects and which involve no shielding structure or means in addition to the conductor arrangement or structure (e.g. co-axial lines), see especially subclasses 243+. SEE OR SEARCH CLASS
174, Electricity: Conductors and Insulators,
32+, and the subclasses specified in the notes thereto for structure and conductor arrangements for preventing or reducing the detrimental effects due to either self-inductance of a single conductor or mutual inductance between plural conductors, other than loaded lines or transmission lines defined as having long line characteristics.
178, Telegraphy,
45, for loaded lines with inductive or radiation reduction means, subclass 63, for cable or long line telegraph systems having means for eliminating "tailings" or having static compensation; and subclass 69 for telegraph line clearing and circuit maintenance systems having means for preventing the detrimental effects produced by induction from external or internal causes.
307, Electrical Transmission or Interconnection Systems,
89+, for miscellaneous electrical systems having anti-induction means or means to prevent undesired coupling to other systems.
331, Oscillators,
67, for oscillator systems provided with an electromagnetic or electrostatic shield.
343, Communications: Radio Wave,
841+, for antennas with an electrical shield; subclass 851 for antennas with a coupling network having a radiation suppressor; and subclass 905 for antennas combined with shielded transmission lines.
361, Electricity: Electrical Systems and Devices, 1+, for transmission lines with means to protect the connected lines from the effects of lightning and other high potential, and for networks for use in surge suppression
circuits, see especially subclass 50 for systems with means to adjust for varying leakage currents; subclasses 82 and 84+ for systems for protecting balanced electrical systems (e.g., polyphase) for balanced current flowing therein; subclasses 88+ for voltage responsive systems; subclass 111 for transient responsive systems; and subclasses 177+ for high voltage dissipation systems (e.g., lightning arresters).
365, Static Information Storage and Retrieval,
198, for transmission lines used for reading and writing information.
379, Telephonic Communications,
398, for telephone systems having means for preventing the detrimental effects occasioned by induction from external or internal causes.
