U.S. PATENT AND TRADEMARK OFFICE
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U.S. Patent Classification System - Classification Definitions
as of June 30, 2000
Patents classified in a subclass may be accessed by either clicking on
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(definitions have been obtained from the
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Electronic Products Branch)
Class 196
MINERAL OILS: APPARATUS
Class Definition:
This class relates to apparatus for treating, refining, or
recovering mineral oils such as petroleum, coal tar, pitch,
asphalt or related products, not elsewhere classified.
Included specifically in this class are apparatus for
dewaxing, solvent extraction or refining of such mineral oils
as well as stills designed for mineral oil distillation and
condensers peculiarly adapted and limited to the mineral oil
art.
REFERENCES TO OTHER CLASSES
SEE OR SEARCH CLASS:
15, Brushing, Scrubbing, and General Cleaning, 104.011,
104.02 and 104.03 for implements there provided for which are
used for removing carbon and which are not claimed as being
permanently associated with the vaporizing apparatus but may
be applied to other chambers.
34, Drying and Gas or Vapor Contact With Solids, subclass 72
for apparatus therein provided for combined with means to
recover vapors or other substances from gases.
48, Gas: Heating and Illuminating, appropriate subclass for
apparatus for converting mineral oil to gases (e.g., by
cracking).
62, Refrigeration, particularly subclass 93, 272, and 900 for
processes and apparatus for separating vapors from gases by
refrigeration.
96, Gas Separation: Apparatus, for apparatus for gas
separation, in general, even though disclosed or claimed for
separating mineral oil vapors from hydrocarbon gases or
combined with broadly recited means for recovering the
mineral oil after separation.
100, Presses, appropriate subclasses for presses not
elsewhere provided for and particularly subclass 104 for
presses with drain means for expressed liquid.
110, Furnaces, for miscellaneous furnace structure.
122, Liquid Heaters and Vaporizers, appropriate subclass for
liquid heaters and vaporizers of general application.
137, Fluid Handling, for fluid feeding and handling not
elsewhere provided for, particularly subclass 386 for liquid
level responsive flow control.
159, Concentrating Evaporators.
165, Heat Exchange, appropriate subclasses for a heat
exchanger not limited to the mineral oil art.
166, Wells, appropriate subclass for apparatus for treating
oil or oil bearing mineral while in the ground.
201, Distillation: Processes, Thermolytic, appropriate
subclasses for a process of producing coke from solid
carbonaceous material and a mineral oil distillate.
202, Distillation: Apparatus, appropriate subclass for
apparatus involving distillation of general utility or which
may be used to treat mineral oils among other materials. Also
apparatus for distilling solid carbonaceous materials is
found in Class 202.
203, Distillation: Processes, Separatory, appropriate
subclass, for a process involving distillation of general
utility or which may treat mineral oils among other
materials.
204, Chemistry: Electrical and Wave Energy, appropriate
subclass for apparatus for treating mineral oils involving
more than the mere thermal effects of the electrical or wave
energy.
208, Mineral Oils: Processes and Products, for processes of
treating, refining or recovering mineral oils and for mineral
oil products.
210, Liquid Purification or Separation, for processes and
apparatus for separating liquids including mineral oils
involving no chemical treatment of the mineral oil.
219, Electric Heating, for electric heaters which may be used
for heating oil.
236, Automatic Temperature and Humidity Regulation,
appropriate subclasses, for means for automatically
maintaining desired temperatures or humidity.
366, Agitating, for means to cause fluid materials to be
commingled.
261, Gas and Liquid Contact Apparatus, appropriate subclasses
for gas-liquid scrubbing devices.
299, Mining or In Situ Disintegration of Hard Material, for a
process or apparatus for treating oil or oil bearing minerals
while in situ in a tunnel or excavation.
422, Chemical Apparatus and Process Disinfecting,
Deodorizing, Preserving, or Sterilizing, subclass 256 and
261 for extracting apparatus; and subclasses 171, 177, 191,
and 211 for catalytic apparatus.
431, Combustion, appropriate subclass for residual combustion
apparatus.
435, Chemistry: Molecular Biology and Microbiology,
appropriate subclass for apparatus specialized for use in
making, separating, or purifying mineral oils or hydrocarbons
by operations that include fermentations.
494, Imperforate Bowl: Centrifugal Separators, appropriate
subclasses, for apparatus for breaking up a mixture of fluids
or fluent substances into two or more components by
centrifuging within a generally solid-walled, receptacle-like
member.
516, Colloid Systems and Wetting Agents; Subcombinations
Thereof; Processes of Making, Stabilizing, Breaking, or
Inhibiting, 135 for processes of or compositions for or
subcombination compositions for the breaking of or inhibiting
of emulsion colloid systems, when generically claimed or when
there is no hierarchically superior provision in the USPC for
the specifically claimed art, including breaking petroleum
emulsion when there is no additional treatment of the
petroleum.
585, Chemistry of Hydrocarbon Compounds, appropriate
subclasses for processes of preparing, recovering or
purifying hydrocarbons of known composition.
SUBCLASSES
Subclass:
14.5
This subclass is indented under the class definition.
Apparatus for separating wax from a petroleum oil to either
recover the wax or purify the oil.
(1) Note. Most of the patents in this subclass include
apparatus for solvent treating the oil combined with some
additional step such as chilling, or apparatus for sweating
the oil out of the wax.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14.52 for apparatus for separating mineral oils by solvent
extraction. Apparatus for separation of wax from mineral oil
by solvent extraction is in this subclass (14.5).
46 for apparatus for separating impurities or nonmineral
materials from mineral oils.
SEE OR SEARCH CLASS:
62, Refrigeration, appropriate subclass, for refrigeration
processes and apparatus even though employed for separating
wax from mineral oil.
100, Presses, appropriate subclasses, for presses not
elsewhere provided for. Note particularly subclass 104 for
presses having a drain duct or channel for liquid expressed
from the material pressed.
208, Mineral Oils: Processes and Products, subclass 24 for
processes of separating paraffin waxes from mineral oils.
210, Liquid Purification or Separation, appropriate
subclasses, especially subclass 175 and 774 for separating
processes and apparatus involving the use of heaters or
coolers.
494, Imperforate Bowl: Centrifugal Separators, appropriate
subclasses for a separator of that class, as explained is the
search note to that class appearing in the definition of this
class (196).
Subclass:
14.52
This subclass is indented under the class definition.
Apparatus especially adapted for the solvent extraction of
mineral oils.
(1) Note. The apparatus classified herein is adapted to the
separation of mineral oils of natural origin into its
component fractions as well as the separation of undesirable
nonmineral oil components from mineral oils by use of
solvents.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14.52 for apparatus for dewaxing mineral oils which may be
by solvent extraction.
46 for apparatus for refining mineral oils by reacting with
chemicals to separate nonmineral oil components therefrom.
SEE OR SEARCH CLASS:
208, Mineral Oils: Processes and Products, subclass 311 for
processes of extracting mineral oils with solvents.
422, Chemical Apparatus and Process Disinfecting,
Deodorizing, Preserving, or Sterilizing, 255 for extraction
apparatus in general.
Subclass:
46
This subclass is indented under the class definition.
Apparatus peculiarly adapted for the separation of impurities
or nonmineral oil components from mineral oils.
(1) Note. The apparatus classified herein provides for the
most part for apparatus for treating mineral oils with
chemicals to separate or remove nonmineral oil components
therefrom.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14.5 for apparatus used to dewax mineral oils.
14.52 for apparatus specially adapted to extract mineral
oils with solvents.
SEE OR SEARCH CLASS:
62, Refrigeration, appropriate subclass, for apparatus for
refining by refrigeration alone.
96, Gas Separation: Apparatus, for apparatus for gas
separation.
201, Distillation: Processes, Thermolytic, appropriate
subclass, for a thermolytic distillation process including
recovery of oil.
202, Distillation: Apparatus, for apparatus for separating
components of a nonmineral oil mixture by distillation.
203, Distillation: Processes, Separatory, appropriate
subclass, for a process of separating components of a
nonmineral oil mixture by distillation.
208, Mineral Oils: Processes and Products, subclass 177 for
processes of refining mineral oils.
210, Liquid Purification or Separation, appropriate subclass
for processes and apparatus for purifying nonmineral oil
liquids and for filters and decanting devices.
261, Gas and Liquid Contact Apparatus, appropriate subclass,
for gas-liquid scrubbing devices.
422, Chemical Apparatus and Process Disinfecting,
Deodorizing, Preserving, or Sterilizing, subclass 252 for
chemical apparatus in general.
494, Imperforate Bowl: Centrifugal Separators, appropriate
subclasses, for a separator of that class, as explained in
the search note to that class appearing in the definition of
this class (196).
Subclass:
46.1
This subclass is indented under subclass 46. Apparatus which
also includes filtering means.
SEE OR SEARCH CLASS:
210, Liquid Purification or Separation, for filters and for
processes of filtering mineral oil, per se.
Subclass:
98
This subclass is indented under the class definition.
Apparatus comprising the combination of a vaporizer and a
condenser where that apparatus is peculiar to the art of
mineral-oil distillation.
SEE OR SEARCH CLASS:
202, Distillation: Apparatus, for similar apparatus for
distilling other materials.
208, Mineral Oils: Processes and Products, subclass 92, 100
and 347 for mineral oil distillation processes.
Subclass:
99
This subclass is indented under subclass 98. The combination
of a vaporizer with a condenser, usually a dephlegmator or
fractionating column, provided with means for returning part
or all of the condensate from the condenser to the
vaporizer.
SEE OR SEARCH THIS CLASS, SUBCLASS:
139 for dephlegmator or fractionating columns alone.
SEE OR SEARCH CLASS:
201, Distillation: Processes, Thermolytic subclass 29, for a
thermolytic distillation process including the step of
returning a volatile to the carbonization zone.
202, Distillation: Apparatus, subclass 152, for separatory
distillation apparatus including the combination of a
vaporizer, a condenser and means for returning at least a
part of the condensate from the condenser to the vaporizer.
203, Distillation: Processes, Separatory, subclass 75, 78,
82, 84, 93, 97, and 98, for a separatory distillation process
including the step of returning a condensate to a
distillation zone.
Subclass:
100
This subclass is indented under subclass 99. Fractionating
columns provided with heating means for causing vaporization
of the liquid-mineral-oil- feeding stock.
SEE OR SEARCH THIS CLASS, SUBCLASS:
139 for columns which are heated merely by hot vapors that
are treated and which are generated in a separate vaporizer.
SEE OR SEARCH CLASS:
202, Distillation: Apparatus, appropriate subclasses,
particularly subclass 153, for separatory distillation
apparatus including association of still and fractionating
column.
260, Chemistry of Carbon Compounds, appropriate subclasses.
Subclass:
102
This subclass is indented under subclass 98. Vaporizing
apparatus containing some means for causing condensation
within the vaporizer or for collecting condensate formed
within the condenser.
Subclass:
103
This subclass is indented under subclass 98. Vaporizing
apparatus having heads or domes that are provided with means
for condensing, filtering, or otherwise treating vapors from
the vaporizer.
SEE OR SEARCH CLASS:
122, Liquid Heaters and Vaporizers, subclass 508.
159, Concentrating Evaporators, subclass 31.
165, Heat Exchange, appropriate subclasses for a heat
exchanger not limited to the mineral oil art.
Subclass:
104
This subclass is indented under the class definition.
Vaporizing apparatus peculiarly designed for use in the
distillation of mineral oils.
SEE OR SEARCH CLASS:
48, Gas: Heating and Illuminating.
122, Liquid Heaters and Vaporizers.
159, Concentrating Evaporators. 165, Heat Exchange,
appropriate subclasses, for a heat exchanger of general
application.
202, Distillation: Apparatus, subclass 152 and 232, for
distillation apparatus in which the distilland is vaporized.
203, Distillation: Processes, Separatory, appropriate
subclasses for a process of vaporizing a liquid.
Subclass:
105
This subclass is indented under subclass 104. A plurality of
interconnected mineral-oil vaporizers,.
SEE OR SEARCH THIS CLASS, SUBCLASS:
111 for vaporizers provided with baffles.
Subclass:
106
This subclass is indented under subclass 105. A plurality of
mineral-oil vaporizers connected in series, so that the oil
being distilled passes from one vaporizer to the next.
SEE OR SEARCH CLASS:
159, Concentrating Evaporators, subclass 17.1.
202, Distillation: Apparatus, subclass 173, for a separatory
distillation system having a plurality of stills in series.
203, Distillation: Processes, Separatory, subclass 71, for a
separatory distillation process including a series of
distillation steps.
208, Mineral Oils: Processes and Products, subclass 49 and
subclass 350 for processes including plural serial stages of
mineral oil conversions or distillations, respectively.
Subclass:
107
This subclass is indented under subclass 104. Vaporizing
compressing heating tubes or coils for heating the
mineral-oil and a drum or expansion chamber connected to the
tube or drum. An expansion valve may or may not be placed
between the tube and drum, and the drum may or may not be
heated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
110 for tubular vaporizers.
SEE OR SEARCH CLASS:
122, Liquid Heaters and Vaporizers, subclass 40 and
235.11+.
159, Concentrating Evaporators, subclass 2.
208, Minerals Oils: Processes and Products, subclass 131 for
processes of cracking mineral oils employing this type of
apparatus.
Subclass:
108
This subclass is indented under subclass 107. Vaporizers,
having a means for returning the oil from the drum back to
the tube for retreatment.
Subclass:
109
This subclass is indented under subclass 108. Vaporizers,
wherein a part at least of the drum is placed vertically
above a part of the tube.
Subclass:
110
This subclass is indented under subclass 104. Vaporizers,
for mineral-oil distillation that are tubular and usually of
comparatively small cross section.
SEE OR SEARCH THIS CLASS, SUBCLASS:
107 for tube and drum type of vaporizer.
Subclass:
111
This subclass is indented under subclass 104. Vaporizers
having therein one or more partitions or baffles either
placed in the vapor space to separate it into a plurality of
chambers or placed in the liquid space to cause the liquid
oil to follow a tortuous path through the vaporizer.
SEE OR SEARCH THIS CLASS, SUBCLASS:
128 for vaporizers having baffles to cause the oil to flow
in films.
Subclass:
112
This subclass is indented under subclass 104. Vaporizers
mounted so as to permit their rotation.
SEE OR SEARCH CLASS:
122, Liquid Heaters and Vaporizers, subclass 11 and 12.
159, Concentrating Evaporators, subclass 6.1.
202, Distillation: Apparatus, subclass 238, for separatory
distillation apparatus in which the still is mounted upon an
axis and rotated or tilted during distillation.
Subclass:
114
This subclass is indented under subclass 104. Vaporizers
adapted for the distillation of mineral-oils under reduced
pressure.
SEE OR SEARCH CLASS:
159, Concentrating Evaporators, subclass 17.1.
208, Mineral Oils: Processes and Products, subclass 357 and
366 for processes of distilling mineral oil under reduced
pressure.
Subclass:
115
This subclass is indented under subclass 104. Vaporizers
having peculiar or nonconventional shapes.
Subclass:
116
This subclass is indented under subclass 104. The
combination of a furnace with a mineral-oil vaporizer where
the combination is designed to solve a problem peculiar to
the art of mineral-oil distillation.
SEE OR SEARCH CLASS:
110, Furnaces, for miscellaneous furnace structure alone.
122, Liquid Heaters and Vaporizers, for the combination of
furnace with a closed liquid heater and vaporizer of general
application.
126, Stoves and Furnaces, subclasses 344-363.1 for a liquid
heater that may include a kettle, a steam generator, stove
pipe for use with a stove, a domestic water heater or boiler
(e.g., kitchen boiler, range boiler, etc.) for use with a
stove or furnace.
264, Plastic and Nonmetallic Article Shaping or Treating:
Processes, subclass 30 for furnace lining formation or
repair and see the notes thereto.
Subclass:
117
This subclass is indented under subclass 116. The
combination of furnace with mineral-oil vaporizer having
flues for combustion gases passing through the vaporizer.
SEE OR SEARCH CLASS:
122, Liquid Heaters and Vaporizers, subclass 44.1 and
135.1.
159, Concentrating Evaporators, 28.1 and 40.
Subclass:
118
This subclass is indented under subclass 104. Mineral-oil
vaporizers having therein baths that are liquid, but
substantially nonvolatile at the vaporizing temperature
employed. Such material may be metal, fusible salts, or heavy
hydrocarbons.
SEE OR SEARCH CLASS:
48, Gas: Heating and Illuminating, subclass 92.
Subclass:
119
This subclass is indented under subclass 104. Mineral-oil
vaporizers that are provided with jackets around at least
part of their periphery. These jackets may be for the purpose
of heating, cooling, or heat insulating the vaporizer.
Subclass:
120
This subclass is indented under subclass 104. Mineral-oil
vaporizers provided with heating means other than furnaces,
liquid baths, jackets, or other conventional heating means.
SEE OR SEARCH CLASS:
165, Heat Exchange, appropriate subclasses for a heat
exchanger, per se.
Subclass:
121
This subclass is indented under subclass 120. Mineral-oil
vaporizers heated in part at least by electric heaters.
SEE OR SEARCH CLASS:
48, Gas: Heating and Illuminating, subclass 65 and 103.
392, Electric Resistance Heating Devices, 386 for
electrically heated vaporizer structure.
Subclass:
122
This subclass is indented under subclass 104. Mineral-oil
vaporizers provided with means for removing carbon from the
oil or from the vaporizer.
SEE OR SEARCH THIS CLASS, SUBCLASS:
124 for vaporizers with mechanical agitators or
circulators.
SEE OR SEARCH CLASS:
15, Brushing, Scrubbing, and General Cleaning, 104.011,
104.02 and 104.03, or Class 414, Material or Article
Handling, subclass 291, and other appropriate subclasses, for
carbon removing devices which are not claimed as being
permanently associated with the vaporizing apparatus but may
be applied to other chambers.
122, Liquid Heaters and Vaporizers, subclass 379.
201, Distillation: Processes, Thermolytic, subclass 2, for a
thermolytic distillation process including the step of
removing adhering carbon from the apparatus.
202, Distillation: Apparatus, subclass 241, for distilling
apparatus including means for cleaning and decarbonizing or
preventing the fouling of the retort or still or the tubes of
the heating system therefore.
208, Mineral Oils: Processes and Products, subclass 48.
Subclass:
123
This subclass is indented under subclass 104. Mineral-oil
vaporizers provided with means for causing or directing the
circulation or agitation of the oil.
SEE OR SEARCH CLASS:
122, Liquid Heaters and Vaporizers, subclass 379 and 406.1.
165, Heat Exchange, subclass 108 for a heat exchanger with
means directing recirculation, and subclass 109.1 for a heat
exchanger with an agitator.
208, Mineral Oils: Processes and Products, subclass 367 for
distillation processes with agitation.
366, Agitating, appropriate subclasses.
Subclass:
124
This subclass is indented under subclass 123. Mineral-oil
vaporizers provided with moving or rotating mechanical means
for causing or directing the circulation or agitation of the
oil.
SEE OR SEARCH THIS CLASS, SUBCLASS:
122 for means for removing carbon combined with vaporizer.
Subclass:
125
This subclass is indented under subclass 123. Mineral-oil
vaporizer provided with baffles to cause the oil to
cyclically circulate in a definite path.
SEE OR SEARCH THIS CLASS, SUBCLASS:
111 for baffles or partitions to cause the oil to pass
through the vaporizer in a tortuous path.
Subclass:
126
This subclass is indented under subclass 123. Mineral-oil
vaporizers provided with means for injecting a gas, vapor, or
liquid to cause circulation or agitation of the oil in a
definite predetermined manner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
127 for fluid injectors not designed or placed primarily to
cause a definite path of circulation or agitation.
Subclass:
127
This subclass is indented under subclass 104. Mineral-oil
vaporizers provided with means for injecting gas, vapor, or
liquid into the oil being distilled.
SEE OR SEARCH THIS CLASS, SUBCLASS:
126 for fluid injectors which cause a definite circculation
or agitation of the oil.
SEE OR SEARCH CLASS:
122, Liquid Heaters and Vaporizers, 5.51.
159, Concentrating Evaporators, subclass 16.1.
208, Mineral Oils: Processes and Products, subclass 125, 128,
356 and 362 for processes for mineral oil treatment involving
injecting a gas, vapor or liquid.
261, Gas and Liquid Contact Apparatus, appropriate subclass.
Subclass:
128
This subclass is indented under subclass 104. Mineral-oil
vaporizers having means for causing the oil being distilled
to assume the form of a film or spray.
SEE OR SEARCH CLASS:
122, Liquid Heaters and Vaporizers subclass 39, and subclass
501.
159, Concentrating Evaporators, subclass 3 and 5.
239, Fluid Sprikling, Spraying, and Diffusing, appropriate
subclasses for nozzle devices, per se, especially subclass
193 for weir type discharge means discharging a film or
curtain or fluid.
Subclass:
129
This subclass is indented under subclass 104. Mineral-oil
vaporizers having tubes or legs projecting from the main body
of the vaporizer down into the furnace, the ends of the tubes
so projecting being closed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
107 for heating tubes one end of which is connected with a
vaporizer and the other end of which is connected either with
a source of supply of oil or with the vaporizer.
110 for vaporizers consisting entirely of tubular elements.
Subclass:
130
This subclass is indented under subclass 104. Mineral-oil
vaporizers that have bottoms of peculiar shape, construction,
or position.
Subclass:
131
This subclass is indented under subclass 130. Mineral-oil
vaporizers whose bottoms are not subjected to the direct
heating action of the furnace or other heating means, usually
for the purpose of avoiding the caking of precipitated
carbon.
Subclass:
132
This subclass is indented under subclass 104. Mineral-oil
vaporizers provided with means for automatically maintaining
desired conditions, usually the temperature, constant within
the vaporizer.
SEE OR SEARCH THIS CLASS, SUBCLASS:
141 for condensing apparatus with similar automatic means.
SEE OR SEARCH CLASS:
122, Liquid Heaters and Vaporizers, subclass 448.1 and 449.
165, Heat Exchange, 200 for automatic control of a heat
exchhanger of general utility.
201, Distillation: Processes, Thermolytic, subclass 1 for a
thermolytic distillation process combined with the positive
step of determining some characteristic of the distilland,
vapor, residue or condensate.
202, Distillation: Apparatus, subclass 160 for a column
having automatic temperature and/or pressure control.
203, Distillation: Proceesses, Separatory, subclass 1, for a
separatory distillation process including determining a
characteristic or condition in the system.
236, Automatic Temperature and Humidity Regulation,
appropriate subclasses.
Subclass:
133
This subclass is indented under subclass 104. Mineral-oil
vaporizers having some special feature of construction not
otherwise provided for.
SEE OR SEARCH CLASS:
52, Static Structures (e.g., Buildings), subclass 192 for an
in situ constructed type container or hopper, per se, having
a material port.
Subclass:
134
This subclass is indented under subclass 104. Mineral-oil
vaporizers having means for preheating the incoming oil by
the heat of the vapors or the unvaporized residue of
distillation.
SEE OR SEARCH CLASS:
159, Concentrating Evaporators, subclass 24.1 and 46.
165, Heat Exchange, subclass 66 for apparatus for exchanging
heat between the supply and exhaust lines of a heated or
cooled vessel.
201, Distillation: Processes, Thermolytic, subclass 14 for
heating the carbonaceous material by indirect heat exchange
with a conversion product of the carbonization step.
202, Distillation: Apparatus, subclass 150, 159 and 177, for
distillation apparatus combined with a preheater.
203, Distillation: Processes, Separatory, in which the feed
is indirectly heated by recovered heat.
Subclass:
135
This subclass is indented under subclass 104. Special means
for feeding the oil to the vaporizer,.
SEE OR SEARCH CLASS:
137, Fluid Handling, for fluid feeding and handling not
otherwise provided for, particularly subclass 386 for liquid
level responsive flow control.
159, Concentrating Evaporators, subclass 43.1.
Subclass:
136
This subclass is indented under subclass 104. Special
constructions for vapor outlets.
Subclass:
137
This subclass is indented under subclass 104. Miscellaneous
attachments for mineral-oil vaporizers.
Subclass:
138
This subclass is indented under the class definition.
Apparatus for condensing mineral-oil vapors which by
construction and operation is peculiar to this art.
SEE OR SEARCH CLASS:
165, Heat Exchange, appropriate subclasses, for a heat
exchanger not specialized to condesing mineral-oil vapor.
202, Distillation: Apparatus, appropriate subclasses, for
distillation apparatus particularly subclass 185.1.
208, Mineral Oils: Processes and Products subclass 347 for
distillation of mineral oils.
Subclass:
139
This subclass is indented under subclass 138. Condensing
apparatus, peculiar to this art, generally known in the art
as dephlegmators or fractionating columns, where the
condensate formed in cooler zone is reheated and partially
revaporized by vapors in a hotter zone.
SEE OR SEARCH THIS CLASS, SUBCLASS:
100 for similar devices combined with combined condensing
and vaporizing apparatus.
SEE OR SEARCH CLASS:
201, Distillation: Processes, Thermolytic, appropriate
subclasses, particularly subclass 30, for a proocess of
fractioonally condensing removed vapor.
202, Distillation: Apparatus, subcalsses 153 and 158, for
distillation apparatus including a fractionating column, and
subclass 179 and 198 for distillation apparatus including a
dephlegmator.
203, Distillation: Processes, Separatory, subclass 22 and
87, for a distillation process in which tthe distillation
process in which the vapor is in indirect heat exchange with
the feed or the vapor is fractionally condensed.
260, Chemistry of Carbon Compounds, appropriate subclasses.
261, Gas and Liquid Contact Apparatus, appropriate
subclasses.
Subclass:
140
This subclass is indented under subclass 138. Condensing
apparatus peculiar to this art where the vapors are brought
in direct contact with a cooling liquid, usually water.
SEE OR SEARCH CLASS:
261, Gas and Liquid Contact Apparatus, appropriate
subclasses.
Subclass:
141
This subclass is indented under subclass 138. Apparatus for
condensing mineral-oil vapors provided with means for
automatically controlling the temperature of condensation.
SEE OR SEARCH CLASS:
165, Heat Exchange, 281 ; 287+ for heat exchange means with
automatic temperature or pressure control.
236, Automatic Temperature and Humidity Regulation,
appropriate subclasses.
Subclass:
155
This subclass is indented under the class definition.
Apparatus not provided for specifically above.
(1) Note. Many of the patents classified in this subclass
are for apparatus for recovering mineral oils from natural or
converted gases.
SEE OR SEARCH CLASS:
62, Refrigeration, appropriate subclasses, for processes and
apparatus for separating vapors from gases by refrigeration
(e.g., liquefaction, gas compression).
96, Gas Separation: Apparatus, for apparatus for gas
separation where the recovery of the mineral oil after
separation is not included or is recited only broadly.
208, Mineral Oils: Processes and Products, subclass 340 for
processes of separating mineral oils from natural or
converted gases including specific recovery of the mineral
oil vapor.
Information Products Division -- Contacts
Questions regarding this report should be directed to:
U.S. Patent and Trademark Office
Information Products Division
PK3- Suite 441
Washington, DC 20231
tel: (703) 306-2600
FAX: (703) 306-2737
email: oeip@uspto.gov
Last Modified: 6 October 2000