(under subclass 459) Subject matter wherein the pressure within an area is monitored by ionizing the gas or vapor therein and then analyzing the ionization.
(1) Note. The gas or vapor may be ionized by application of a radio frequency field to the area and the glow discharge then analyzed. The color of the glow is an indication of pressure.
(2) Note. The discharge characteristics, i.e., voltage or current can also be measured as an indication of pressure.
SEE OR SEARCH CLASS
73, Measuring and Testing,
384, for atmospheric pressure measurement not involving ionization; also subclasses 700+ for fluid pressure measurement not involving ionization.
