.~ For protecting evacuated, bowl-enclosing housing against gaseous infiltration
DEFINITION
Classification: 494/39
For protecting evacuated, bowl-enclosing housing against gaseous infiltration:
(under subclass 38) Apparatus wherein the means comprises a device or element for preventing the leakage or air or any other gas at ambient pressure into, and thereby raising the absolute pressure within, a structure in which the pressure has been reduced to less than atmospheric and within which the bowl is located.
(1) Note. A common reason for providing an evacuated region for the bowl is to reduce the resistance of air to the bowl's rotational movement, as in the instance, for example, of an ultraspeed centrifuge.
(2) Note. See (3) Note of subclass 23 above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23, as explained in the reference thereto appearing in (2) Note above.
