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CLASS 353,	OPTICS: IMAGE PROJECTORS
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SECTION I - CLASS DEFINITION

This class provides for projectors not elsewhere classified. This class includes the projectors for particular types of objects to be projected; such as maps and aerial photographs, targets, transparent plates, information data, microscopic objects, scales and indicators, and stencils or perforated plates. Various other species and types of projectors are also included here such as kaleidoscopic, heliostats, stereoscopic and relief, pointers, gun type, moving images on screens, episcopes and cabinets including screens.

Various plural and composite types of projectors are included such as projectors involving plural projected images including multicolor, projectors for images combined with real objects, projectors with manual delineation, and plural projection with a single light source.

Projectors selective at the operators choice are also included as where the selection is between a slide and a film strip, between a cabinet and a distant screen, and between opaque and transparency projection i.e., epidiascope.

Certain combinations and perfecting features are included such as with vehicles, with sound accompaniment, with editing or auxiliary viewing, additional illumination of or near screen, temperature control, distortion compensation, housings, structurally related projectors and screens, and lamp control. Included also are improvements in particular elements of or their relation to the projector, when the elements are claimed in combination with other projector structure. These improvements may be in the projector filters, prisms, shutters, gates, reflectors, lens supports, condensers, and slide changers.

Certain subcombinations of projectors are included here, usually where they are peculiar to projectors, such as slide changers, housings and picture carriers.

Methods of projection are included here. This is usually the method of operating projection apparatus in a particular manner.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

PROJECTORS CLASSIFIED ELSEWHERE

Class 434, Education and Demonstration, subclasses 180, 314+, and 324+, provides for projectors with some limitation for use with teaching. Class 178, Telegraphy, especially subclass 23 for telegraphic printing which may involve projection. These may also be considered as projectors combined with telegraphy apparatus. Class 250, Radiant Energy, subclass 329 has the projection of invisible radiant energy images onto a fluorescent or phosphorescent screen, subclasses 458.1+ has the irradiation of fluorescent and phosphorescent devices and subclasses 483.1+ for fluorescent and phosphorescent devices, per se. Class 359, Optical: Systems and Elements, subclasses 369 and 400 provides for compound lens systems with viewing screens. Class 351, Optics: Eye Examining, Vision Testing and Correcting, subclasses 210+ and 237+, for eye examining instruments with chart or target projection. Class 352, Optics: Motion Pictures, for motion picture projectors. Class 396, Photography, subclass 430 for a camera convertible to developed image projectors or viewer. Class 355, Photocopying, subclasses 18+ for copying cameras or projecting printers involving projection on a photographic film for recording the projected image; the copying background in a patent is sufficient for classification in Class 355 as opposed to this Class 353. Class 356, Optics: Measuring and Testing, subclasses 391+ provides for configuration comparison involving projection on a viewing screen. Class 348, subclasses 744+ for television projection devices.

PROJECTORS COMBINED WITH OTHER STRUCTURE AND CLASSIFIED ELSEWHERE

Class 33, Geometrical Instruments, subclass 1, provides for image projectors combined with measuring means; subclasses 20.1+ for image projectors in combination with a claimed scribing or tracing means; and subclasses 501+, for patents including an image projector and a feeler which contacts an article to be tested. Class 434, Education and Demonstration, subclasses 180, 314+, and 324+ provides for an image projector having mechanism for uncovering an answer or in combination with an educational device which includes means by which a student controls or operates the device and subclass 286 for planetarium projectors. Class 52, Static Structures (e.g., Buildings), provides for a projector in combination with a stadium or auditorium. Class 368, Horology: Time Measuring Systems or Devices, subclasses 41+, 82+, and 239+, for clocks including projection of the hands or dial. Class 116, Signals and Indicators, subclasses 246+ for radio tuning indicators with projectors, Class 177, Weighing Scales, subclass 178 for projection scales. Class 178, Telegraphy, especially subclasses 23+ for telegraphic printing which may include projection. Class 352, Optics: Motion Pictures, subclass 131 provides for a projector in combination with a motion picture projector and Class 355, Photocopying, subclasses 18+ for copying cameras which contain projection systems. Class 348, subclasses 744+ for television projection devices.

PROJECTOR SUBCOMBINATION CLASSIFIED ELSEWHERE

Class 206, Special Receptacle or Package, subclass 456 provides for slide magazine, per se, i.e., with no limitation for operation in a projector; Class 226, Advancing Material of Indeterminate Length, especially subclasses 52+ for film advancing mechanisms; Class 242, Winding, Tensioning, or Guiding, subclasses 324+ for a device for unwinding and rewinding a machine convertible information bearing carrier which may include image film, and subclasses 520+ for a convolute winding process or machine in general use; Class 362 Illumination, subclasses 257+, for projection lamps which may be used in projectors; Class 248, Supports, subclasses 637+ for projection machine supports; Class 359, Optical: Systems and Elements, subclasses 443+ for projection screens; subclasses 642+ for lenses; subclasses 838+ for reflectors; and subclasses 885+ for optical filters.

FACSIMILE, TELEVISION, AND TELEGRAPHIC PRINTING

Exhibitors involving conversion from electrical to optical form are in Class 348, subclasses 744+ when a television receiver is claimed in combination with projection structure (such as lens, filter and reflector combinations) to transmit the image from a cathode-ray tube to a viewing surface. Class 359 provides for lenses, filters and reflectors set forth as being for use with a television or in a television cabinet. This Class 353 provides for combinations or subcombinations of projectors which employ a concentrated source of light where the source of light is not a cathode-ray tube. Since the cathode-ray tube has the image thereon and no concentrated light is projected through or reflected from that image, the combination of a cathode-ray tube and a lens, for example, is not within the Class 353 definition.

Class 178, subclasses 23+ provides for detailed stock tickers or other Class 178 printers in combination with either a detailed or a broadly claimed projector. This Class 353, in subclasses 46+ provides for a detailed projector in combination with a nominal stock ticker. Class 178, subclass 42 provides for the combination of a nominal printer, a nominal projector, and a detailed tape-feeding mechanism, since Class 226 does not provide for this combination. Class 226 does provide for tape-advancing means in combination with a projector when only one optical element is claimed, or in combination with a nominal printer; but does not provide for a combination including a projector and a printer.

PROJECTION LIGHTS

Class 362 in subclasses 257+ provides for light projectors or subcombinations of image projectors which merely claim elements such as lights, condensing lenses, filters, screens for filtering, masks, or reflectors. However, this Class 353 provides for image projectors which include elements such as a slide guideways, filmgates, objective lenses, viewing screens, or means to dissolve images.

A light or shadow spot projector for pointing out part of an image on a viewing screen is classified in this Class 353, subclass 42 even though other light projectors are in Class 362.

Class 362 includes patents where the mere image of the light source or its filament is obtained.

OPTICAL ELEMENTS (E.G., LENSES AND SCREENS)

Class 359 includes projection lens systems, lens mounts, lens supports, and optical elements where no other image projector structure such as a slide changer shutter, film gate, viewing screen or light source is recited in the claims.

Class 359, subclasses 443+ also provides for projection screens, per se, or in combination with lenses. However, when a projection screen is in combination with an image projector having a concentrated source of light, classification is in Class 353.

MOTION PICTURE PROJECTORS

Motion picture image projectors which create an illusion of motion by employing the persistence of vision of a person are provided for in Class 352. If there is a recitation in the claims of "a motion picture projector", "animation projector", or equivalent terminology; or if structure definitive of motion picture mechanism is made, classification is in Class 352. However, the mere motion picture background is not sufficient to remove subject matter from Class 353 to Class 352. Patents which set forth the combination of a still and a motion picture projector are classified in Class 352, subclass 131; and those patents which claim devices convertible from still to motion or from motion to still picture projector are classified in Class 352, subclass 131; and those patents which claim devices convertible from still to motion or from motion to still picture projectors are in Class 352, subclasses 136 and 147.

Class 352, subclasses 1+ provides for motion picture projectors accompanied by sound where the "motion" is either claimed or disclosed.

SLIDE EXHIBITORS AND SLIDES

Class 40, subclasses 701+ provides for slides and slide mounts where no particular image or optical relationships are recited. However, this Class 353, subclass 120 includes slides where there is a relationship of the images thereon, or where the slide has both a visual and a sound record.

Slide changers disclosed as being useful with a mere viewer are in Class 40, while slide changers disclosed for use with image projectors or for either viewers or image projectors are in this Class 353.

SECTION III - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

SECTION IV - GLOSSARY

CONCENTRATED LIGHT SOURCE

The source of illumination for the projector. It may be either a projection lamp or a lens and mirror system utilizing sunlight.

CONDENSING LENS

A lens which parallels the light from the light source for uniform distribution over the object to be projected and makes the light impinge on the object at right angles to the plane of the object.

FILM STRIP

An indeterminate length of film having a plurality of images thereon.

IMAGE

The optical counterpart of an object produced by a lens or other optical system. In an image projection system an image of an object is formed on a screen or other viewing surface. A photographic camera forms an image of an object on a photosensitive film. After the film is developed, a picture of the original object appears on the film. A picture of this type is generally employed as the object in image projectors.

LIGHT PARALLELING STRUCTURE

Optical elements for directing the light from the concentrated light source so that it impinges on the object perpendicular to the plane of the object and uniformly illuminates the object to be projected.

OBJECT

The object is the subject, the image of which is to be projected (see definition of image).

OBJECT HOLDER

Structure for holding the object in the projecting position, as well as for moving the object in and out of such position. Examples are slide transfer mechanisms and film holders.

PROJECTION OBJECTIVE OR PROJECTION LENS SYSTEMS

Forms an image of the object on the viewing surface, and is located between the object and viewing surface.

PROJECTOR OR STEREOPTICON

A device for projecting an image of an object by passing light through or around the object or reflecting light from the object on a viewing screen for the purpose of more conveniently viewing the image of the object. The image is usually enlarged or reduced in size with reference to the object; and the image is also usually in a more convenient position for viewing or recording. Since projection is a common property of lenses and mirrors, the projectors in this class involve some structure for facilitating or enhancing the projection over what incidentally occurs in these optical elements. A projector generally includes (1) a concentrated light source from either an artificially or natural emanation, (2) a light paralleling element (e.g., condensing lens), (3) a holding or positioning device for the object to be projected, (4) a projection objective or projection lens system comprising one or more optical elements for directing the light after it passes through or is reflected from the object to form an image, and (5) a screen for receiving the image and making the image formed by this light available for use. The projectors in this class utilize natural or artificial (usually) light within the visible spectrum. The object to be projected is usually planar in natural with the plane extending transverse to the direction of projection, and may be transparent (e.g., slide or transparency) or reflective (e.g., opaque sheet). The projection may be limited to the outline of an opaque object such as a shadow, and in this case the object need not be planar. The term projector as used in this class designates the above structure either with or without the screen. In operation the object is positioned outside one focal plane of the projection lens system and the image is formed on a viewing surface outside the opposite focal plane of the projection lens system. The closer the object is to the one focal plane the farther the image will be from the other focal plane, and the bigger the image will be. In the projector the relative positioning of the object is usually obtained by moving the projection lens system and adjusting its focal length rather than by changing the position of the object. As indicated in FACSIMILE, TELEVISION, AND TELEGRAPHIC PRINTING, above, the projectors including or adapted for use with recording surfaces are classified elsewhere.

SCREEN

This is a planar (usually) light diffusing surface positioned with its plane surface substantially transverse to the projector light for presenting the image in viewable form.

SLIDE

A piece of transparent film having a single image thereon, and also having a frame or two glass plates to help keep the piece of film from bending.

STEREOPTICON

See Projector.

SUBCLASSES

1	KALEIDOSCOPIC
	This subclass is indented under the class definition.  Subject matter including a plurality of reflecting surfaces so arranged in the optical path that images of objects viewed as multiple images of the objects arranged in a symmetrical pattern and relative motion between the objects and the reflecting surfaces or between the reflecting surfaces and observer changes the patterns. (1) Note. The reflecting surfaces are usually elongated and at an angle to each other which forms a V-shaped trough when two mirrors are employed. SEE OR SEARCH CLASS: 359,  Optical: Systems and Elements,   subclasses 616+ for a kaleidoscope where a pattern is merely viewed. See (2) Note to Class 359, subclass 616.

2	Including particles loosely housed for agitation
	This subclass is indented under subclass 1.  Subject matter including a chamber of loosely assorted objects, usually of irregular shapes, transparent and varicolored, which may be tumbled over each other by rotation of the chamber or moved in other ways to give ever-changing visual effects. SEE OR SEARCH CLASS: 359,  Optical: Systems and Elements,   subclass 617 for similar kaleidoscope structure where the pattern is viewed without use of an image projector.

3	HELIOSTATS
	This subclass is indented under the class definition.  Subject matter wherein solar light is employed to project an image and comprising essentially a reflector and mechanism for causing it to follow the apparent movement of the sun so as to keep the direction of the reflected light constant and appropriate for projecting the image. (1) Note. This subclass provides for subcombinations of a Heliostat not provided for elsewhere.

4	ASCENDING HEATED AIR CHANGES PICTURES
	This subclass is indented under the class definition.  Subject matter wherein an object to be projected is moved to and from the projection position by convection currents of air which usually move a fan which in turn moves the object.

5	MAPPING OR AERIAL PHOTOGRAPH RECTIFYING
	This subclass is indented under the class definition.  Subject matter wherein the projection system is especially adapted to project an image (usually an aerial photograph of the terrain) on a surface for making a map, or to compensate for the orientation of the camera which produced the aerial photograph being projected, or to align or superimpose parts of such aerial photographs. SEE OR SEARCH THIS CLASS, SUBCLASS: 1, for projection of a map or projection of a target or spot light on a map. SEE OR SEARCH CLASS: 33,  Geometrical Instruments,   subclass 1 for similar subject matter combined with measuring means and subclasses 20.1+ for similar subject matter combined with a claimed scribing or tracing means. 250,  Radiant Energy,   for similar subject matter employing photocells. 348,  Television,   subclasses 144+ for television systems in which images of maps may be projected to effect a comparison of the maps. 356,  Optics: Measuring and Testing,   subclasses 391+ for projecting images of maps to compare them.

6	Stereoscopic
	This subclass is indented under subclass 5.  Subject matter wherein the projected pictures were taken from different points of view and have separate perspectives corresponding to the perspective offered by the right and left eyes of a viewer. SEE OR SEARCH CLASS: 348,  Television,   subclasses 42+ for stereoscopic television systems. 356,  Optics: Measuring and Testing,   subclass 2 for structure responsive to two stereoscopic images and furnishing a contour plot of the earth based on the distinctions of the images. 359,  Optical: Systems and Elements,   subclass 470 for similar subject matter where the pictures are merely viewed and no image is projected on a screen.

7	STEREOSCOPIC
	This subclass is indented under the class definition.  Subject matter where the projection system is adapted to project pairs of individual picture elements having separate perspectives corresponding to the perspective offered by the right and left eyes of a viewer. (1) Note. The individual picture elements are taken from two different points of view and each eye of the viewer receives only the information obtained from one point of view when viewing the projected images on a screen. (2) Note. This subclass also provides for attachments which convert a conventional still projector to a stereoscopic projector. SEE OR SEARCH THIS CLASS, SUBCLASS: 10, for projection systems for creating an illusion of three dimensional views without employing separate left-right images. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 57+ for stereoscopic motion pictures devices. 359,  Optical: Systems and Elements,   subclasses 462+ for stereoscopic viewers. 378,  X-Ray or Gamma Ray Systems or Devices,   subclasses 41+ for stereoscopic X-ray devices. 396,  Photography,   subclasses 324+ for stereoscopic still cameras.

8	Polarizer
	This subclass is indented under subclass 7.  Subject matter including light polarizing material in at least one light path for allowing light of a certain polarization to pass therethrough and blocking certain other light.

9	Slide transfer mechanism
	This subclass is indented under subclass 7.  Subject matter including mechanism for moving stereoscopic slides into the projection path; or portions of this mechanism such as a slide changer which moves slides from a magazine into the projection path and back to the magazine or a magazine which moves to position individual slides next to the slide changer. SEE OR SEARCH THIS CLASS, SUBCLASS: 103+, for projector slide transfer mechanism generally.

10	RELIEF ILLUSION
	This subclass is indented under the class definition.  Subject matter wherein the projection system is adapted to provide an illusion of depth from a single projected image obtained from only one point of view. SEE OR SEARCH THIS CLASS, SUBCLASS: 7, for stereoscopic projectors employing pictures taken from two perspectives corresponding to right and left eye views of the observer. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclass 86 for motion picture devices giving relief illusion. 359,  Optical: Systems and Elements,   subclasses 478+ for viewers which give an illusion of depth.

11	TARGET, MAP OR NAVIGATION PROJECTION
	This subclass is indented under the class definition.  Subject matter wherein the projector is especially adapted to project an image of a map or navigation chart; an image of a target onto a map or chart; or a target which represents a vehicle such as an aircraft onto a screen. SEE OR SEARCH THIS CLASS, SUBCLASS: 114, for a pointer which denotes a certain part of a projected image. SEE OR SEARCH CLASS: 73,  Measuring and Testing,   subclass 178 , for navigation instruments. 340,  Communications: Electrical,   subclasses 988+ for electrical means in combination with a projector for plotting a vehicle"s position. 434,  Education and Demonstration,   subclasses 44 and 69+ for similar structure where training mechanism is claimed which the student controls, adjusts or handles to help train him.

12	With or for vehicle
	This subclass is indented under subclass 11.  Subject matter wherein the projector is in combination with a mobile carrier such as a ship, automobile, or airplane; or in which the projector is adapted to be employed in a vehicle.

13	WITH OR FOR VEHICLE
	This subclass is indented under the class definition.  Subject matter in which the projector is in combination with a mobile carrier, such as a ship, automobile, or airplane; or in which the projector includes structure which significantly adapts the projector for operation in a vehicle. (1) Note. To be termed a vehicle for purposes of classification in this subclass (13) the vehicle must be for some purpose other than to merely transport the projector such as a cabinet projector on rollers. Such cabinet projectors are elsewhere (see Search This Class, subclass below). SEE OR SEARCH THIS CLASS, SUBCLASS: 12, for a projector for maps or navigation in combination with a vehicle. 30+, for cabinet projectors. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclass 132 for a motion picture projector in combination with a vehicle.

14	Instrument indicator
	This subclass is indented under subclass 13.  Subject matter wherein the image projected is of the face of an instrument which informs the driver about a condition or position of the vehicle such as a speedometer or compass. (1) Note. Where details of the instrument are claimed, classification is in the class having the given instrument.

15	WITH SOUND ACCOMPANIMENT
	This subclass is indented under the class definition.  Subject matter wherein the image projector is synchronized or otherwise combined with a means to reproduce sounds, such as music or speech, and which sounds bear a relationship to the projected pictures. (1) Note. The Optics: Motion Pictures, class provides for motion picture projectors accompanied by sound where the "motion" is either claimed or disclosed (see Search Class note below). This Class (353) provides for sound accompanied slide or still picture projectors. SEE OR SEARCH CLASS: 40,  Card, Picture, or Sign Exhibiting,   subclasses 455+ for a changeable exhibitor with sound accompaniment. 352,  Optics: Motion Pictures,   subclasses 1+ for a sound-accompanied motion picture projector. See (1) Note above. 360,  Dynamic Magnetic Information Storage or Retrieval,   subclasses 1+ and 80 for magnetic recorders or reproducers combined with nominal projector apparatus. 369,  Dynamic Information Storage or Retrieval,   subclass 70 for control by a sound-conversion device of a nominally claimed image projector.

16	Phonograph
	This subclass is indented under subclass 15.  Subject matter wherein the sound accompaniment is an instrument for reproducing sounds by means of the vibration of a stylus or needle following a spiral groove on a revolving circular disc or cylinder. SEE OR SEARCH CLASS: 40,  Card, Picture, or Sign Exhibiting,   subclass 455 for a changeable exhibitor in combination with a phonograph.

17	In carrying case
	This subclass is indented under subclass 16.  Subject matter including a housing having a handle for carrying the enclosed projector and phonograph. SEE OR SEARCH THIS CLASS, SUBCLASS: 72+, for a common housing from which the projector or viewing screen is removable. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 34+ for a sound-accompanied motion picture housing.

18	Cabinet encloses projector and one side of screen
	This subclass is indented under subclass 16.  Subject matter including a cabinet which encases the projector and part of the viewing screen and usually also encases the phonograph; and which excludes outside light from the projection path to form a unitary device. SEE OR SEARCH THIS CLASS, SUBCLASS: 74, and see the search notes thereunder for cabinet-type projectors which do not have sound accompaniment. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 34+ for a sound-motion picture housing.

19	Common picture and sound record carrier system
	This subclass is indented under subclass 15.  Subject matter wherein the picture to be projected and the audio record are both on the same film strip or slide or where both are mounted in a common frame. (1) Note. This subclass 19 provides for an image projector and sound reproducer in combination which employs a common picture and sound record carrier. Subclass 120, below, provides for the common carrier, per se.

20	POLARIZER OR INTERFERENCE FILTER
	This subclass is indented under the class definition.  Subject matter including a polarizing element or interference filter in the optical path to modify the light in said path. SEE OR SEARCH CLASS: 359,  Optical: Systems and Elements,   subclasses 483+ for polarizers, per se, and subclasses 577+ for interference filters, per se.

21	EDITING OR AUXILIARY VIEWING
	This subclass is indented under the class definition.  Subject matter wherein the projector is particularly designed so that the pictures to be projected may be directly inspected for faults or arranged in a particular position or sequence; or where the projector has auxiliary means so that the pictures may be previewed before projection or may be viewed on an auxiliary screen during projection on the main screen. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   appropriate subclasses for similar structure employed to edit or preview motion-picture film. 356,  Optics: Measuring and Testing,   for testing film for flaws.

22	TRANSPARENT PLATE
	This subclass is indented under the class definition.  Subject matter including a transparent plate having parallel flat surfaces in the optical path through which the projecting light beam passes.

23	Plate part of film gate
	This subclass is indented under subclass 22.  Subject matter wherein the transparent plate is an essential part of the gate to position a film strip in the focal plane of the projector. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 221+ for a motion-picture projector having a film gate.

24	Including lens support
	This subclass is indented under subclass 23.  Subject matter in combination with means to position a lens in the projector. SEE OR SEARCH THIS CLASS, SUBCLASS: 96, for a projector having a film gate, which does not have a transparent plate, and a lens support. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclass 231 for a motion-picture film gate in combination with a lens mount.

25	SELECTIVE DATA RETRIEVAL
	This subclass is indented under the class definition.  Subject matter wherein a desired one of a plurality of individual units of information may selectively be moved into the optical path for projection from a stored or nonprojectable position either by positioning the unit in the optical path or by moving the optical path to the individual unit. (1) Note. The subject matter here (subclasses 25, 26, 28) involves the selection of any one of the units from the group without regard to any sequential arrangement of the units as is provided for in the subclasses below. (2) Note. The data or information projected here is a record such as an account or real estate register rather than a mere picture to be viewed for enjoyment. SEE OR SEARCH CLASS: 355,  Photocopying,   subclasses 40+ for selecting the data to be copied by a projection printer. 365,  Static Information Storage and Retrieval,   subclasses 185.01+ for floating gate memory storage (e.g. flash memory), subclass 120 for the storage and retrieval of information which has inherent means for reading information into and out of the storage system. 382,  Image Analysis,   subclasses 181+ for character-recognition systems. 399,  Electrophotography,   subclasses 9+ for diagnostics, subclasses 38+ for controls, subclasses 130+ for image formation, subclasses 168+ for charging, subclasses 177+ for exposure, subclasses 222+ for development, subclasses 297+ for transfer, subclasses 320+ for fixing, subclasses 343+ for cleaning, and subclasses 361+ for document handling.

26	Film strip
	This subclass is indented under subclass 25.  Subject matter wherein the data is stored on a strip of film of indeterminate length which usually is supported on a pair of reels which are rotated to bring selected portions of the data into position for projection.

27	Plural picture rows on single microcard
	This subclass is indented under subclass 25.  Subject matter wherein the data is stored in numerous individual areas which are arranged in a plurality of rows or columns on a rectangular sheet of microfilm which is in a flat condition during projection; the optical path and microcard usually being relatively movable to select the individual area to be projected by alignment with the optical path which may include moving a mask to block light from going through the undesired data.

28	PROJECTED IMAGE COMBINED WITH REAL OBJECT
	This subclass is indented under the class definition.  Subject matter wherein the projected image is combined with a real object so that the two may be viewed simultaneously. (1) Note. The real object may be a person or a sign or screen having indicia thereon. However, a mere sign or screen without inherent indicia is not considered a real object for the purpose of this definition since it would add nothing informative to the viewed scene. (2) Note. This subclass provides only for apparatus which produces a scene including a real object and a projected image; if the real object also is projected, classification is in subclasses 30+ below. SEE OR SEARCH THIS CLASS, SUBCLASS: 30+, for the combination of a plurality of projected images. See (2) Note above. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 48+ for methods involving motion pictures and scenery and staging effects, and subclasses 88+ for sets. 356,  Optics: Measuring and Testing,   subclasses 391+ for a projected image in combination with a real object for the purpose of measuring or comparing the two. 472,  Amusement Devices,   particularly subclass 61 for a projected image in combination with a stage which includes a real object and subclasses 75+ for a stage apparatus or setting appropriate therefor.

29	ADDITIONAL ILLUMINATION OF OR NEAR PROJECTED IMAGE
	This subclass is indented under the class definition.  Subject matter including a projector for projecting an image on a surface and also means to illuminate the periphery of that surface to form a lighted border or means to direct additional illumination on the surface for the purpose of improved contrast, picture definition, brilliancy or tinting. SEE OR SEARCH THIS CLASS, SUBCLASS: 84+, for a color filter in the optical path which projects the image. SEE OR SEARCH CLASS: 40,  Card, Picture, or Sign Exhibiting,   subclasses 541+ for illuminated signs, especially subclasses 546+ for edge illuminated. 352,  Optics: Motion Pictures,   for a motion picture projector with additional means to illuminate the projected image. 359,  Optical: Systems and Elements,   subclass 450 for a viewing screen having a lighted border.

30	COMPOSITE PROJECTED IMAGE
	This subclass is indented under the class definition.  Subject matter including at least one image projector to project a plurality of images on a screen in superimposed or in mosaic relationship so that the images each contribute a part of the composite image. (1) Note. One of the images may merely be projected on the screen at intervals while the other is steadily projected. However, if one image is faded in while the other is faded out with no cooperation of the images, classification is not here but in one of subclasses 83, 86, 90 or 93, below. SEE OR SEARCH THIS CLASS, SUBCLASS: 28, for a device to project an image in combination with a real object. 29, for means to project an image in combination with means to project a mere white or colored light. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 46 , 47, 70+, 97, 131+, and 133+ for motion picture devices for composite pictures or images. 355,  Photocopying,   subclasses 40+ for projection printing a composite image. 356,  Optics: Measuring and Testing,   subclasses 391+ for plural projected images on a screen for comparison or measuring purposes. 368,  Horology: Time Measuring Systems or Devices,   subclasses 82+ , and 239+ for means to project a clock face in combination with an advertisement. 399,  Electrophotography,   subclasses 9+ for diagnostics, subclasses 38+ for controls, subclasses 168+ for charging, and subclasses 177+ for exposure.

31	Multicolor picture
	This subclass is indented under subclass 30.  Subject matter including means to project a composite image from a set of pictures, each picture corresponding to a particular color which is different from the color of the other pictures of the set. SEE OR SEARCH THIS CLASS, SUBCLASS: 7+, for a stereoscopic projector employing a set of pictures, each picture having been photographed in a different color. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 66+ for a color motion-picture device.

32	Lenticular film
	This subclass is indented under subclass 31.  Subject matter wherein the projector is adapted for projecting images from lenticular film and usually includes a multizone color filter. SEE OR SEARCH THIS CLASS, SUBCLASS: 120, for a film strip, per se.

33	Prism
	This subclass is indented under subclass 31.  Subject matter including a prism, usually for directing light to the respective pictures or for combining light which has come through the respective pictures. SEE OR SEARCH THIS CLASS, SUBCLASS: 81, for a projector having a prism.

34	Plural projection paths with single light source
	This subclass is indented under subclass 30.  Subject matter including a single lamp and two or more optical paths and means to simultaneously direct light from the lamp to the optical paths. SEE OR SEARCH THIS CLASS, SUBCLASS: 49, for plural projection paths and a single light source in a projector for moving the image on a viewing screen.