(under subclass 68) Subject matter including one or more resistance elements together with one or more switches, which connect the elements in at least two circuit configurations to present two different resistance values across a set of terminals.
(1) Note. This subclass is residual for resistors whose elements are usually of fixed resistance value, which may be switched to present different resistance values across the terminals. Resistors with a tapped element and a contact movable along the taps for varying the resistance across the resistor terminals are classified in subclasses 185+ above. Subclass 215 provides for the combination of a resistor of fixed resistance value together with a switch in series or parallel with the resistance element. In subclass 215 only one ohmic resistance value together with an open or short circuit appears across the terminals regardless of the switching positions. Where two resistance values appear across the terminals due to switching, classification is in this subclass (200) as a residual place.
SEE OR SEARCH THIS CLASS, SUBCLASS:
78, for a mechanically variable resistor combined with a current reversing switch.
172+, for a variable resistor having an angularly slidable contact, and including a switching means.
178, for a variable resistor having a rectilinearly slidable contact separable from the element for switching.
179, for a variable resistor having a rectilinearly slidable contact together with a series switch. 185+, for tap type variable resistors. 191, for a tap type variable resistor with an angularly movable contact and combined with a switch.
198, for a mechanically variable resistor and switch actuated by the resistor actuator.
215, for a combined single fixed resistor and switch.
SEE OR SEARCH CLASS
200, Electricity: Circuit Makers and Breakers, appropriate subclasses, for switches, per se.
307, Electrical Transmission or Interconnection Systems,
112+, for miscellaneous switching systems.
323, Electricity: Power Supply or Regulation Systems,
209+, for systems of a voltage source and a load with a resistance network therebetween whose resistive value may be changed as by switching.
