US PATENT SUBCLASS 239 / 2.1
.~ Of weather control or modification


Current as of: June, 1999
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239 /   HD   FLUID SPRINKLING, SPRAYING, AND DIFFUSING

1  DF  PROCESSES {10}
2.1.~ Of weather control or modification {1}
2.2  DF  .~.~> Snowmaking


DEFINITION

Classification: 239/2.1

Of weather control or modification:

(under subclass 1) Methods for causing or inhibiting changes in atmospheric moisture conditions not elsewhere classified and including methods of precipitating atmospheric moisture and/or inducing clouds, fog or the like to release or disperse their moisture either with or without precipitation of rain.

(1) Note. Examples of method steps for rain production or fog dissipation which have been classified are (1) vibrating or precussing the air, (2) disturbing of the electric charges of particles of the atmosphere, (3) locally reducing atmospheric temperatures, or (4) contacting the moisture laden atmosphere with solid particles or liquid globules small enough to form nuclei about which droplets of moisture may form. Methods of dissipating fog involving no more than merely blowing heated or unheated air or gaseous products of combustion into the atmosphere have been excluded.

(2) Note. For spraying or dispersion of particulate material into the air for purposes other than control of weather, see the class definition, Spraying and Sprinkling.

SEE OR SEARCH THIS CLASS, SUBCLASS:

14.1, for apparatus dealing particularly with control of the weather.

SEE OR SEARCH CLASS

47, Plant Husbandry,

2, for methods of controlling frost to provide an atmosphere favorable to the growth of plant life.

149, Explosive and Thermic Compositions or Charges,

117, for smoke generating or weather modifying compositions containing a resin.

244, Aeronautics,

114, for methods of dissipating fog and the like adjacent an airport or aircraft and which claim a significant relation to the airport or aircraft.

516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

1+, for continuous gas or vapor phase colloid system (e.g., smoke, fog, aerosol, cloud, mist) 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; and when not disclosed as adapted to (1) wet a surface or (2) to precipitate atmospheric moisture, for which see Class 239, the appropriate subclass for compositions for or methods of breaking or inhibiting continuous gas or vapor phase colloid systems.,