This class includes devices and corresponding methods for
mechanically transmitting, for amplifying and for ascertaining the
direction of sound and for mechanically muffling or filtering sound,
and not elsewhere provided for.
Measuring and Testing,
subclasses 572+ and especially 645+ for the determination
of qualities, characteristics or conditions by the utilization of
acoustical energy and which is not specifically provided for elsewhere.
Safes, Bank Protection, or a Related Device,
subclass 21.5 for partitions having a sound transmitting passage
constructed to prevent passage of projectiles.
Wave Transmission Lines and Networks,
subclasses 141+ for electrical delay networks wherein the electrical
waves may be converted to sound waves, such sound waves being delayed
and reconverted to electrical waves, and subclasses 186+ for
wave filters of the electromechanical transducer type, wherein electrical
waves may be converted to sound waves, such sound waves being filtered
and reconverted to electrical waves.
Superconductor Technology: Apparatus, Material,
Process,
subclasses 150+ for high temperature (Tc
30 K) superconducting devices, and particularly subclass 203 for
electroacoustic transducers.
Measuring and Testing,
subclasses 570+ for an acoustic levitation apparatus combined with
a motion sensing device or a motion controlling device and not elsewhere
classified.
This subclass is indented under subclass .5. Construction of speaking-tubes with their associated parts;
also "speaking-tube exchanges", also, any patents
on speaking-tubes not classified elsewhere.
This subclass is indented under subclass .5. Structure of the mouthpieces of speaking-tubes and the combination
therewith of accessory parts, as alarms, indicators, etc.
This subclass is indented under the class definition. Subject matter relating to systems for mechanically transmitting
or receiving acoustical waves for the purpose of identifying geologic
or subsurface structure.
(1)
Note. Subsurface is defined as including anything, whether
composition, article, structure or formation which lies below the
upper natural surface of the earth.
(2)
Note. Acoustical waves are considered to include seismic
waves for the purposes of this section.
(3)
Note. In scope, this subclass is analogous to Class 367 Communications Electrical:
Acoustic Wave Systems and Devices subclasses 25+ and 853.1+ wherein
electrical communication, in part or in whole, is involved.
This subclass is indented under subclass 101. Subject matter wherein said geologic or subsurface structure
includes a shaft or deep boring in the earth.
Wells,
subclasses 64 , 66 and 113 for well apparatus including measuring and
testing means, subclasses 250.01+ for well processes including
measuring and testing, and subclass 264 for processes comprising
merely sampling a well fluid and appropriate subclasses (especially
subclasses 142+ and the subclasses there noted) for the corresponding
apparatus.
Radiant Energy,
subclasses 256+ for ray energy detection or measurement (including
detection or measurement of radioactive materials) applied to bore-hole
and drilling study.
Communications, Electrical: Acoustic Wave Systems
and Devices,
subclasses 25+ for seismic well logging using acoustic wave responsive
electrical means.
This subclass is indented under subclass 102. Subject matter including means operative upon initiation
to transmit or receive acoustical waves through a given cycle of
operations.
This subclass is indented under subclass 102. Subject matter including means for sending, or receiving
acoustical waves which is characterized by some quality that varies
according to the relative bearing of the means.
This subclass is indented under subclass 102. Subject matter for investigating physical conditions of
well bores and casings, such as obstructions, bore surfaces, etc.
Measuring and Testing,
subclasses 152.01+ for a determination of a physical characteristic
of a borehole by making a measurement which is not purely electrical
or purely magnetic and subclass 152.57 for a determination of a
physical characteristic of a casing or a cementing by making a measurement
which is neither purely magnetic.
Measuring and Testing,
subclasses 152.01+ for a determination of a physical characteristic
of a borehole by making a measurement which is not purely electrical
or purely magnetic and subclass 152.57 for a determination of a
physical characteristic of a casing or a cementing by making a measurement
which is neither purely electrical nor purely magnetic.
This subclass is indented under subclass 101. Subject matter including means operative upon initiation
to transmit or receive acoustical waves through a given cycle of
operations.
This subclass is indented under subclass 108. Subject matter wherein the means for transmitting or receiving
seismic waves is elevated above the surface of the earth.
This subclass is indented under subclass 108. Subject matter wherein the means for transmitting or receiving
seismic waves is in wave coupling relationship with a body of water.
This subclass is indented under subclass 108. Subject matter wherein the means for receiving seismic waves
includes more than one seismic wave detector.
This subclass is indented under subclass 113. Subject matter including means for supporting the seismic
wave producing means on a land vehicle.
(1)
Note. Included in this subclass are combinations of a land
vehicle adapted to transport a seismic wave source to a desired
location, a seismic wave source, and means to position the source
in contact with the earth.
This subclass is indented under subclass 113. Subject matter including means to minimize adverse effects
arising from the production of bubbles by the means for producing
seismic waves in a fluid medium.
(1)
Note. Some seismic sources produce seismic pulses by producing
gaseous bubbles which may produce undesired or adverse secondary
impulses. This subclass is drawn to means to mechanically control
or compensate for such secondary bubble impulses.
This subclass is indented under subclass 113. Subject matter wherein the means for producing seismic waves
includes means for utilizing the violent expansion of hot gases
resulting from the sudden combustion of a material.
This subclass is indented under subclass 113. Subject matter wherein the seismic waves are generated by
utilizing the kinetic energy of a moving inertial mass.
This subclass is indented under the class definition. Subject matter having means for sending out a sound wave
and receiving said wave after a reflection being utilized to add
some information to the original wave.
(1)
Note. Except for mechanical altitude or depth detectors in
subclass 124 below, this subclass does not provide for mechanical
systems relating to identifying geologic or subsurface structure which
is provided for by subclass 101 above.
Communications: Directive Radio Wave Systems
and Devices (e.g., Radar, Radio Navigation), appropriate subclass for reflected or otherwise returned
radio wave systems.
This subclass is indented under subclass 123. Subject matter for determining the vertical distance of
a body above the surface of the earth or the vertical distance down
from a surface.
Communications: Directive Radio Wave Systems
and Devices (e.g., Radar, Radio Navigation),
subclasses 1 through 205for reflected radiant energy wave systems and subclasses 350+ for
radio wave systems.
Communications, Electrical: Acoustic Wave Systems
and Devices,
subclass 87 for electrical echo altimeters, subclass 99 for
electrical underwater sound direction indication.
This subclass is indented under the class definition. Subject matter including an acoustical device wherein at
least a portion is in contact with a living being during use.
(1)
Note. This and indented subclasses provided for subcombination
devices particularly adapted for use in or with the acoustical device.
This subclass is indented under subclass 130. Subject matter having a sensing element which is to be used
in contact with a source of sound and a sound conducting element
guiding the sound to an ear contacting element.
Measuring and Testing,
subclasses 585 , 591 and 649+, where the stethoscope is
part of a testing device which tests articles or mechanisms by sensing
the vibrations produced therein.
Electrical Audio Signal Processing Systems and
Devices,
subclass 67 for a stethoscope comprising a vibration-electric
transducer which senses vibrations of the body by virtue of physical
contact between the transducer and the body, there being no acoustical
transmission through the air, and in accordance with said vibrations
controls an electric current which is applied to a hearing or listening
device.
This subclass is indented under the class definition. Subject matter wherein sound is transmitted by the vibrations
of molecules set up by mechanical means in a wire, string or flexible member
strung taut.
This subclass is indented under the class definition. Subject matter to which has been added a subcombination
or assembly which is recognized as the subject matter of some other
class.
This subclass is indented under the class definition. Subject matter for continuously moving a sound source (e.g.,
loudspeaker) or for continuously moving a sound reflector located
in the sound path.
(1)
Note. The continuous motion is generally designed to produce
a tremulant effect.
This subclass is indented under the class definition. Subject matter including at least two separate means that
can be vibrated by sound waves or produce sound waves.
Electrical Audio Signal Processing Systems and
Devices,
subclasses 150+ for instruments designed to transform variable
electrical current or potential into sound in combination with means
to intensify the sound by mechanical means. Note especially subclasses
337+ for such combinations having sound resonators as the intensifying
means. Also subclasses 193 and 202+ for diaphragm and
support means with electrical means to move the diaphragm.
This subclass is indented under subclass 144. Subject matter including sound absorbent material associated
therewith for preventing undesirable effects.
This subclass is indented under the class definition. Subject matter having means that can be vibrated by sound
waves or produce sound waves and means to support and means to at least
partially contain the vibrated means.
Electrical Audio Systems Processing Systems and
Devices,
subclasses 150+ for instruments designed to transform variable
electrical current or potential into sound in combination with means
to intensify the sound by mechanical means. Note especially subclasses
337+ for such combinations having sound resonators as the intensifying
means. Also subclass 193 and 202+ for diaphragm and support
plus electrical means to move the diaphragm.
This subclass is indented under subclass 149. Subject matter wherein the means to support the diaphragm
is provided with means to facilitate mounting within or behind a
surface wall or an exposed surface.
This subclass is indented under subclass 148. Subject matter including sound absorbent material within
the means to enclose the diaphragm for preventing undesirable effects.
This subclass is indented under subclass 148. Subject matter including a tube of varying sectional area
associated with the diaphragm for intensifying the sound waves
produced therefrom.
This subclass is indented under subclass 148. Subject matter wherein the means to enclose the diaphragm
has at least one surface that is circular or curved.
This subclass is indented under subclass 148. Subject matter wherein the means to support the diaphragm
is mounted at an angle to both the horizontal and vertical axes
of one side of the enclosure means.
This subclass is indented under subclass 148. Subject matter wherein the vibrated means is substantially
enclosed and a portion of a radiation wave from in front of the
vibrated means is deflected or modified.
(1)
Note. The enclosure has only openings for sound to be emitted.
An enclosure which has no top, back, or etc., will be found above.
This subclass is indented under subclass 148. Subject matter wherein the vibrated means is substantially
enclosed and a portion of a radiation wave from the rear of the
vibrated means is propagated forward after a shift or modification
of the wave.
(1)
Note. The enclosure has only openings for sound to be emitted.
An enclosure which has no top, back or, etc., will be found above.
(2)
Note. A grille of cloth or other material that sound passes
through is not considered a reflector for this subclass.
This subclass is indented under the class definition. Subject matter including a vibratable partition which is
designed to produce sound waves when driven.
This subclass is indented under subclass 161. Subject matter wherein the driver unit is a needle or holder
furnished with an abrasive-resistant tip.
(1)
Note. This is primarily a collection of old style phonograph
pick-up heads which include a thin metallic diaphragm directly actuated
by a stylus bar.
This subclass is indented under subclass 157. Subject matter wherein two or more diaphragms are driven
by the same mechanism, or arranged so that the sound waves produced
by one cause the other to vibrate.
(1)
Note. Each of the diaphragms must have at least a portion
of its surface facing the surface of the other.
(2)
Note. The diaphragms are usually aligned on a common axis,
and may be surrounded by walls to form an airtight compartment.
This subclass is indented under subclass 157. Subject matter wherein the diaphragm has areas of different
material, shape or thickness which are united to form a vibratable
partition.
(1)
Note. Only one independent driver unit may drive the diaphragm.
When the different sections are driven independently of one another,
they are considered plural, independent diaphragms and classified
in subclasses 144+.
(2)
Note. The different sections may have different natural periods
of vibration and thus produce sound waves within different frequency
ranges.
This subclass is indented under subclass 164. Subject matter wherein the diaphragm has a central section
which is attached to and surrounded by at least one concentric,
annular portion.
(1)
Note. The outer, ring-like section is usually designed to
vibrate within a lower frequency range than the center section, and
often supports the center section.
This subclass is indented under subclass 157. Subject matter including means to suppress or limit diaphragm
vibrations.
(1)
Note. The damping means must be in addition to diaphragm
structure, for example an air chamber, a travel limiter, or a special
coating on the diaphragm.
This subclass is indented under subclass 157. Subject matter wherein the diaphragm is constructed of specific
material or the diaphragm is covered or saturated, at least in part,
with extraneous material.
This subclass is indented under subclass 171. Subject matter wherein the means to hold the diaphragm is
sufficiently flexible to permit the diaphragm to vibrate freely.
This subclass is indented under subclass 173. Subject matter wherein the thickness of the vibratable partition
constituting the diaphragm varies across its surface.
This subclass is indented under the class definition. Subject matter for (1) deviation of the direction of an
acoustical wave, (2) blocking of an acoustical wave, or (3) the
modification of the character or property of an acoustical wave.
This subclass is indented under subclass 175. Subject matter wherein a structure is placed in front of
an acoustic wave device having an aperture which inserts a phase
delay over the cross section of the aperture so as to effect a convergence
or divergence of acoustic waves from the acoustic wave device.
This subclass is indented under subclass 175. Subject matter comprising a hollow member open at opposite
ends and having a progressively increasing cross sectional area
from one end to the other. Sound is introduced at the smaller open
end and emerges increased in loudness at the larger open end.
(1)
Note. A device which both increases the loudness of the sound
and modifies the quality or tone of the sound is properly classified
here.
This subclass is indented under subclass 177. Subject matter wherein the horn includes means to effect
a reduction in size from an operative condition to an inoperative
condition, e.g., telescopes or folds.
This subclass is indented under subclass 177. Subject matter including a compartment exterior to the basic
horn shape, but in communication with the horn via a sound passage
or a vibrating portion of the horn wall.
(1)
Note. The compartment does not necessarily intensify the
sound but does affect the quality or tone of the sound coming from
or passing through the horn.
This subclass is indented under subclass 182. Subject matter wherein the resonant chamber lies between
at least part of a side of the horn and a second structure substantially
parallel to that part of the horn.
This subclass is indented under subclass 177. Subject matter including structure within the horn which
constitutes an obstruction to the sound waves.
(1)
Note. The restriction can be an object placed within the
horn or a pinch in the horn walls which generally affects the quality
or tone of the sound in addition to decreasing the loudness by partially blocking
the expected sound path.
This subclass is indented under subclass 177. Subject matter wherein the sound intensifying horn comprises
more than one section having an increasing cross-sectional area
in the direction of travel of the sound.
(1)
Note. The sections may range in type from divisions within
one horn to independent horns bundled together.
This subclass is indented under subclass 187. Subject matter wherein the plural intensifying portions
have substantially the same shape or are mirror images of one another.
This subclass is indented under subclass 177. Subject matter wherein the structure forming the sound intensifying
horn comprises two or more units attached together. Each unit must include
part of a given sound path.
This subclass is indented under subclass 192. Subject matter wherein the wall of the horn is arranged
to provide a sound path which changes direction by substantially
180 degrees at least twice.
(1)
Note. Such arrangements are also called "reflex
type" or "internally reversed".
This subclass is indented under subclass 192. Subject matter wherein the horn has a mouth from which sound
emanates and has at least a quarter circle silhouette when viewed
from one of its sides.
This subclass is indented under subclass 175. Subject matter wherein a mechanical restriction or valve
is located within a sound conducting tubular member.
(1)
Note. The structure generally affects the loudness of the
sound and/or its quality or tone.
This subclass is indented under subclass 198. Subject matter wherein the enclosure is specially designed
to confine an acoustic wave emitting device, which device does not
form an element of this class type or is not claimed in combination
with the subject matter of another class.
(1)
Note. Subject matter of this class type in combination with
or forming an element of an art device is with the appropriate art.
(2)
Note. See the Index to Classification: "Anti-Noise", "Deadeners" and "Mufflers".
Optics: Motion Pictures,
subclass 35 for mounts and housings for motion picture apparatus
with acoustical damping of the sound originating in the motion picture
apparatus.
This subclass is indented under subclass 200. Subject matter wherein a reaction-type engine is completely
enclosed while undergoing a testing operation.
This subclass is indented under subclass 200. Subject matter wherein the type of machine enclosure is
for internal-combustion engines, e.g., automobiles, tractors, lawnmowers,
etc.
Internal-Combustion Engines, for engines of this subclass type, per se, and in combination
with subject matter similar to that of this class (181), note especially
subclass 198 .
This subclass is indented under subclass 200. Subject matter wherein only certain parts of a machine are
enclosed, or the enclosure partially covers the device.
This subclass is indented under subclass 175. Subject matter wherein the means for modifying the sound
includes modulating the sound by interacting or introducing an additional higher
or lower frequency to the sound source, the resulting sound being
at a different frequency.
Wave Transmission Lines and Networks,
subclasses 165+ for electrical wave filters, and particularly subclasses
186+ for electric wave filters of the electromechanical
transducer type, and subclass 81 for electrical attenuators.
This subclass is indented under subclass 175. Subject matter comprising sound deadening material physically
or mechanically attached or installed on the acoustical device,
or an element thereof to prevent vibratory noise usual to the operation
of the device.
Measuring and Testing,
subclasses 514.12+ for fluid or fluent material dampening of an inertial
member in an acceleration measuring apparatus and subclass 514.14
for vibration dampening in an inertial-type acceleration measuring
apparatus.
This subclass is indented under subclass 207. Subject matter wherein the sound deadening material is applied
to vibratile structure or other bending surfaces to dampen the sound.
This subclass is indented under subclass 175. Subject matter comprising physical barriers which absorb,
direct, and/or block sound waves from acoustical devices.
(1)
Note. Subject matter of this subclass type includes, for
example, sound absorbing fences erected along runways at airports
and along highways.
This subclass is indented under subclass 175. Subject matter not provided for above comprising some acoustical
device or other device having a function other than sound modifying
or sound muffling combined with or in addition to sound modifying
or sound muffling means.
(1)
Note. Subject matter claimed in combination with or forming
an element of an "Art Device" are with the appropriate art.
This subclass is indented under subclass 175. Subject matter for conducting or guiding moving liquids
or gases, and acting on such moving liquids or gases to attenuate
acoustic waves therein, i.e., "mufflers".
(1)
Note. Such devices in combination with or forming an element
of an art device are with the appropriate art.
(2)
Note. See the Index to Classification: "Anti-Noise", "Deadeners" and "Mufflers".
This subclass is indented under subclass 212. Subject matter comprising fluid conducting device which
muffles or dampens noise emanating from a reaction type engine.
(1)
Note. In the subject matter of this subclass type, the engine
is usually shrouded and the muffling means are generally along the
shroud.
(2)
Note. For recited combinations of reaction engines and muffling
means, see the reference to Class 60, Power Plants, in the Search
Note below.
Power Plants, for reaction engines, per se, and
subclasses 272+ and 685+ for combinations of engines or
motors with means for treating the exhaust fluids.
This subclass is indented under subclass 213. Subject matter wherein the shroud is comprised of adjustable
tail end sections and the position of the shroud end sections determine
the degree of attenuation.
This subclass is indented under subclass 215. Subject matter wherein the tail end sections are adjustable
longitudinally of the shroud in the downstream direction.
This subclass is indented under subclass 213. Subject matter wherein the fluid conducting device can be
attached to and detached from the exhaust end of the jet engine
exhaust nozzle.
(1)
Note. Subject matter of this subclass type, because of its
size, is usually mounted on wheels or other means for mobility.
This subclass is indented under subclass 213. Subject matter wherein the fluid conducting device is a
fixed structure with an opening to receive the tail end of a jet
engine exhaust nozzle.
(1)
Note. The jet engine is usually brought to the site of the
structure. The structure may also be provided with multiple receiving
stations.
This subclass is indented under subclass 213. Subject matter wherein the jet engine shroud comprises a
series of repositionable barriers spaced along the internal surface
of the shroud.
This subclass is indented under subclass 213. Subject matter in which a fluid is introduced into and mingled
with the moving fluids to assist in muffling, as by dilution or
condensing the moving fluids.
(1)
Note. Chemical treatments of exhaust gases are not in this
class. See Class 23, for chemical treatment.
This subclass is indented under subclass 213. Subject matter comprising sound absorbing material positioned
in the shroud to be contacted by the exhaust gases, as by surrounding or
being positioned adjacent to and communicating with the exhaust
gases.
This subclass is indented under subclass 212. Subject matter comprising silencer muffler which attenuates
explosive sounds generated by small firearms and which have a straight-through
passage for the projectile and silencing chambers for the explosive
exhaust.
This subclass is indented under subclass 212. Subject matter comprising ducts or conduits for the movement
of streams of air therethrough.
(1)
Note. The ducts of this subclass type are usually lined with
sound absorbing material or other sound absorbing structure for
attenuating the sound waves of moving air.
Ventilation,
subclass 262 for an air mixing building inlet airway having specific
noise prohibiting structure; cross-reference art collection 906
for ventilating means, in general, including specific noise prohibiting
structure; and subclasses 329, 338, and 341+ for inlet
or outlet air pumps which forcefully admit or exhaust air from the
stationary structure of a building.
This subclass is indented under subclass 212. Subject matter wherein there is provided rotating fan means
to assist in the movement of fluid through the sound modifying means.
(1)
Note. The fan of this subclass type may be operated by the
force of the moving fluid or may be operated by some other mechanical
means.
This subclass is indented under subclass 212. Subject matter wherein there is provided some means for
varying the fluid flow while attenuating and diffusing the sounds
normally produced by moving fluids.
This subclass is indented under subclass 212. Subject matter wherein the fluid conducting device is comprised
of a conduit with sound attenuating chambers along the length thereof.
(1)
Note. Subject matter of this subclass type is generally referred
to as a tail pipe, and is usually connected to a muffler which is
not claimed as part of the system.
This subclass is indented under subclass 212. Subject matter comprising an attenuating fluid conducting
device in combination with an additional pipe (i.e., exhaust pipe)
connected to the exhaust outlet of the attenuating device.
This subclass is indented under subclass 212. Subject matter wherein the fluid conducting attenuating
device is mounted on a carburetor (air intake) of an internal-combustion
engine.
(1)
Note. Subject matter of this subclass type includes, for
example, devices designed for attenuating air intake noise for gasoline
engines, compressors, and burners.
(2)
Note. For structure claimed in combination with the silencer
and which goes beyond the scope of this class, such as specific
motor structure, or specific art device, search the appropriate
art classes.
This subclass is indented under subclass 212. Subject matter wherein the fluid conducting attenuating
device is mounted on the exhaust end of a compressed air or vacuum
actuated motor (i.e., air hammer, tool, etc.).
(1)
Note. Structure claimed in combination with the silencer
and which goes beyond the scope of the class is classified with the
art device. For example, the combination of an impact tool plus
a muffler for the tool is classified with the impact tool.
This subclass is indented under subclass 212. Subject matter wherein there is provided additional means
which at the same time remove from the moving fluids (exhaust) all
entrained dirt particles, sparks, and the like.
This subclass is indented under subclass 212. Subject matter provided with a plurality of sound attenuating
devices, each either of duplicate or different design and connected
one after the other in the down-stream direction.
This subclass is indented under subclass 212. Subject matter wherein the fluid conducting attenuating
device suppresses the transmission of sound waves or similar vibrations
(fluid impulses) along pipes and conduits carrying fluids.
This subclass is indented under subclass 233. Subject matter in which the fluid conductor is part of a
fluid supply leading to or part of a water closet.
This subclass is indented under subclass 212. Subject matter comprising a valve device which can be utilized
for diverting the moving fluid away from the fluid conducting attenuating
device which performs the muffling operation.
This subclass is indented under subclass 212. Subject matter wherein there is provided a valve responsive
to relieve excess pressure to the atmosphere.
This subclass is indented under subclass 212. Subject matter wherein the moving fluid is introduced in
the muffler via at least two inlets or expelled through at least
two outlets.
This subclass is indented under subclass 212. Subject matter for collecting and conducting the fluids
from single or multiple cylinders into a single exhaust pipe.
This subclass is indented under subclass 212. Subject matter wherein two or more of the internal parts
of external casing sections can be repositioned relative to each
other to change the size of the muffler.
This subclass is indented under subclass 212. Subject matter comprising devices constructed to be spoken
into.
(1)
Note. Only such parts of the device necessary to establish
the environment are included in this subclass. For devices such
as microphones, telephones, etc., per se, search the appropriate
art.
This subclass is indented under subclass 212. Subject matter having means to facilitate the repair of
damaged parts or elements of the muffling device.
(1)
Note. Subject matter of this subclass type includes, for
example, muffling devices which can be disassembled with minimum
mechanical manipulations.
This subclass is indented under subclass 212. Subject matter comprising means for preventing chemical
erosion of the material of which the device is made.
This subclass is indented under subclass 244. Subject matter wherein at least some of the fluid contacting
surfaces of the conducting devices are coated so as to prevent corrosion.
This subclass is indented under subclass 212. Subject matter wherein the fluid is conducted through a
fluid conducting device having a linear, unobstructed passage at
least the same size from the inlet to the outlet.
This subclass is indented under subclass 247. Subject matter wherein the passage is comprised of a continuous
uninterrupted conduit from its inlet to the outlet.
(1)
Note. Subject matter of this subclass type may have sound
absorbing material.
This subclass is indented under subclass 249. Subject matter having cushion, acoustic filter, or resonator
chambers in communication with the through passage.
This subclass is indented under subclass 247. Subject matter having acoustic wave attenuating material
positioned within the fluid conducting device to be contacted by
the exhaust fluid as by surrounding the through passage or being
positioned adjacent to and communicating with the exhaust fluids.
This subclass is indented under subclass 247. Subject matter having one or more passages, which performs
a muffling function, which bypass the whole or part of the through
passage.
(1)
Note. Subject matter of this subclass type includes, for
example, devices in which the bypassed fluid is returned out of
phase with the fluid in the through passage.
This subclass is indented under subclass 212. Subject matter having acoustic wave attenuating material
positioned to be contacted by the moving fluid, as by surrounding
or being positioned adjacent to and communicating with the fluid
passage.
This subclass is indented under subclass 256. Subject matter wherein the sound absorbing material is directly
in the flow path of the moving fluid, and the fluid must pass through
the material to its exit.
This subclass is indented under subclass 212. Subject matter in which a fluid is introduced into and mingled
with the moving fluids to assist in muffling, as by diluting and
condensing the moving fluids.
This subclass is indented under subclass 259. Subject matter wherein the device is provided with openings
for admitting the fluid through said opening as a result of a vacuum
created by the moving exhaust fluids.
This subclass is indented under subclass 262. Subject matter wherein the motion of the device on which
the muffler is installed creates a vacuum by scooping a fluid as
the device moves.
This subclass is indented under subclass 264. Subject matter having a plurality of serially connected
fluid passages substantially parallel to the inlet, the direction
of flow of the fluid being reversed as it travels through each successive
passage.
This subclass is indented under subclass 265. Subject matter having cushion, acoustic filter, or resonator
chambers in communication with the fluid passage.
This subclass is indented under subclass 264. Subject matter in which are provided a plurality of coaxial
cylindrical chambers having fluid pervious walls through which the
fluid flows in a radial direction into the atmosphere.
This subclass is indented under subclass 269. Subject matter wherein there is a plurality of partial barriers
alternately spaced along the length of the muffler casing.
This subclass is indented under subclass 269. Subject matter wherein at least one of the partitions defining
the chamber is repositionable with respect to another.
This subclass is indented under subclass 269. Subject matter having cushion, acoustic filter, or resonator
chambers in communication with the fluid passages.
This subclass is indented under subclass 269. Subject matter in which the inlet to the expansion chamber
and the baffles are in such direction as to impel the fluid into
a circular flow.
This subclass is indented under subclass 264. Subject matter having cushion, acoustic filter, or resonator
chambers in communication with the fluid passages.
This subclass is indented under subclass 264. Subject matter having baffles constantly in motion, and
driven either under the force of the moving fluid or by some external
means.
(1)
Note. Subject matter of this subclass type includes, for
example, baffles which form rotating vanes.
This subclass is indented under subclass 277. Subject matter having means tending to force the moving
baffle toward a position to restrict flow of fluid.
This subclass is indented under subclass 264. Subject matter in which the baffles are arranged to guide
the moving fluid through an axially or radially expanding, circular
path.
This subclass is indented under subclass 264. Subject matter having baffles angularly disposed relative
to the axis of the flow passage, i.e., not parallel to the axis.
This subclass is indented under subclass 264. Subject matter comprising the jacket or housing structure
of the fluid handling device wherein the jacket or housing structure
is more than nominally recited.
This subclass is indented under subclass 282. Subject matter having a chamber or other structure for providing
a cooling fluid to lower the temperature of the moving exhaust fluids.
Static Structures (e.g., Buildings),
subclasses 144+ for a combination of units having an exposed surface
configuration having an acoustical function, or a unit with a feature
for such a combination.
This subclass is indented under subclass 284. Subject matter comprising sound attenuating structural elements
or units, e.g., blocks, sufficiently strong or rigid to support
a load.
Static Structures (e.g., Buildings),
subclasses 144+ for a combination of units having an exposed surface
configuration having an acoustical function, or a unit with a feature
for such a combination.
This subclass is indented under subclass 284. Subject matter whose composition, size or shape is related
to a particular type of acoustic wave attenuation, e.g., insertion
loss, transmission loss, or specific acoustic structure (Helmholtz
resonator, 1/4 wavelength chamber depth).
This subclass is indented under subclass 284. Subject matter comprising either discrete elements (e.g.,
tubular constituents) or components which form, or cooperate to
form, cavities the longitudinal axis of which are at an angle to
the plane of the major face of the product.
(1)
Note. Multilayer products having one layer formed as a honeycomb-like
or cellular layer are found in this class, subclasses 290+.
This subclass is indented under subclass 175. Subject matter comprising structures of sound absorbing
material for absorbing acoustic energy in rooms or similar chambers
within which the structure is enclosed.
(1)
Note. Subject matter of this subclass type, for example,
is usually formed as a hollow box and suspended from a wall or ceiling
or used in anechoic chambers.
This subclass is indented under subclass 175. Subject matter comprising methods of attenuating sound.
(1)
Note. Methods of this subclass type may attenuate the entire
sound or selected frequencies thereof.
(2)
Note. Patents claiming both a method of attenuating sound
and a product or apparatus for attenuating sound are placed above
in the appropriate subclass and cross-referenced here.
(3)
Note. Methods of making a sound attenuating product or apparatus
are found in the various manufacturing classes involved.
CROSS-REFERENCE ART COLLECTIONS
The following subclasses are collections of published disclosures
pertaining to various specified aspects of the acoustic art which
aspects do not form appropriate bases for subclasses in the foregoing
classification (i.e., subclasses superior hereto in the schedule),
wherein original copies of patents are placed on the basis of proximate
function of the apparatus. These subclasses assist a search based
on remote function of the apparatus and may be of further assistance
to the searcher, either as a starting point in further related fields
of search inside or outside the class. Thus, there is here provided a
second access for retrieval of a limited number of types of disclosure.
(1)
Note. Disclosures are placed in these subclasses for their
value as references and as leads to appropriate main or secondary
fields of search, without regard to their original classification
of their claimed subject matter.
(2)
Note. The disclosures found in the following subclasses are
examples, only of the indicated subject matter, and in no instance
do they represent the entire extent of the prior art.
(3)
Note. Original copies of patents are not placed in the following
subclasses.
Elements or material for transforming sound wave energy
from high to low pressure and vice versa.
(1)
Note. Included herein are means to transmit sound waves from
one medium to another medium with minimum reflection, deviation
or absorption wherein the means acts as a mechanical impedance matching
means. The impedance matching may be a function of the material
or may be due to the shape or configuration of an element such as
a horn shape.
Note: The Patent
and Trademark Depository Library Program (PTDLP) administers a nationwide
network of public, state and academic libraries designated as Patent and
Trademark Depository Libraries authorized by 35 U.S.C. 13 to: Disseminate
Patent and Trademark Information Support Diverse Intellectual Property
Needs of the Public. PTDL Contact Information
Note: For information/comments on electronic information products, such
as purchasing USPTO data, or to discuss system requirements for magnetic
tape products, contact:
KEY: =online
business system =fees =forms=help =laws/regulations =definition
(glossary)
The Inventors
Assistance Center is available to help you on patent
matters.Send questions about USPTO programs and services
to theUSPTO
Contact Center (UCC). You can suggest USPTO webpages
or material you would like featured on this section by E-mail
to the webmaster@uspto.gov.
While we cannot promise to accommodate all requests, your suggestions
will be considered and may lead to other improvements on the
website.
![[Search a list of Patent Appplications for class 181]](../as.gif)
CLASS 181,![[List of Patents for class 181 subclass .5]](../ps.gif)
.5
=online
business system 
=fees 
=forms
=help 
=laws/regulations 
=definition
(glossary)