(under the class definition) Devices in which a diaphragm or nipple of resilient material (such as rubber) has an aperture therethrough, the walls of which contact each other in the normal unstressed condition, the walls separating when stressed to permit passage of material and resiliently returning into contact when the stress is removed.
(1) Note. In many of these devices the pressure of the contents causes the diaphragm or nipple to be stressed. Where the pressure creating means is claimed, see appropriate preceding subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
92+, for collapsible wall receptacles. Where this type outlet is claimed in combination with a collapsible wall type receptacle recited by name (no characteristics thereof being recited, and no combined feature for operating on the wall), the patent is placed in subclass 490.
206+, for resilient wall dispensers.
251+, and see the notes thereto for dispensers having means for creating pressure on the contents to be dispensed. 491+, for other types of resilient outlets operated by pressure of the container contents.
SEE OR SEARCH CLASS
137, Fluid Handling,
525, for resilient material valves opened by pressure of material in the line.
215, Bottles and Jars,
11, for nipples.
251, Valves and Valve Actuation, sub- classes 4+ for tube compressors.
