(under subclass 37) Pipes in which the means restricts the flow in the pipe, but does not cut off entirely.
(1) Note. This subclass and the indented subclasses include some devices disclosed for the purpose of forming a mixture or emulsion of a plurality of fluids but in which the claims are limited to the structure of the conduit and the flow restrictor. See the Search Class Notes below.
SEE OR SEARCH CLASS
62, Refrigeration,
511, and 527+ for restrictors tied up with a refrigerating system.
73, Measuring and Testing, 707, for restrictors for protecting gages and claimed in combination therewith or otherwise tied up with the gage structure, and subclasses 861.42+, where the restrictor is tied up with connections to a flow meter.
99, Foods and Beverages: Apparatus, appropriate subclasses for apparatus other than a mere mixer, for treating foods and beverages and not elsewhere provided for. See the (1) Note above.
166, Wells,
91.1, for well head apparatus with chokes or beans.
184, Lubrication,
6+, and subclass 52 for restrictors tied up with a lubricating system.
210, Liquid Purification or Separation,
118, for the combination of a separator and a variable restrictor responsive to a condition, subclasses 418+ for a filter and flow controller combination, and subclasses 435+ for strainers in pipes which incidentally restrict.
241, Solid Material Comminution or Disintegration, appropriate subclasses for apparatus for forming suspensions of solids in liquids. See the (1) Note above.
252, Compositions,
302+, for processes used and apparatus for forming stable colloidal suspensions or emulsions not elsewhere provided for. See the (1) Note above.
366, Agitating, 336+, for mixing devices having features additional to merely a conduit and flow restrictor for effecting agitation in a liquid flowing therethrough, and subclasses 176.1+ for a similar device including force applying feed means to effect emulsification. See the (1) Note above.
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,
9+, for colloid systems of liquid continuous phase (e.g., emulsions, suspensions, dispersions, foams) or agents for such systems or making or stabilizing such systems or agents, when generically claimed or when there is no hierarchically
superior provision in the USPC for the specifically claimed art.
