US PATENT SUBCLASS 359 / 443
PROJECTION SCREEN

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

443PROJECTION SCREEN {13}
444  DF  .~> With sound producer
445  DF  .~> Acoustical
446  DF  .~> Moving during projection
447  DF  .~> Tracing (e.g., camera lucida, etc.)
448  DF  .~> With lens (e.g., camera obscura, etc.)
449  DF  .~> With reflector or additional screen
450  DF  .~> Border, mask, shade, or curtain
451  DF  .~> Curved
452  DF  .~> Embedded particles {1}
454  DF  .~> Unitary sheet comprising plural refracting areas {1}
459  DF  .~> Unitary sheet comprising plural reflecting areas
460  DF  .~> Rear projection screen
461  DF  .~> Roll up screen

DEFINITION

Classification: 359/443

PROJECTION SCREEN:

(under the class definition) Subject matter including a sheet or other extending surface or area which is especially adapted to render an image of an object which is projected thereon visible to an observer, usually by diffusing the projected light.

(1) Note. This subclass and those indented thereunder in this class (359) include screens where the size, shape, or refractive index of embedded particles is claimed or screens with elements having geometric curves, with relative refractive indices or parts with claimed patterns, with wave plates, acoustical characteristics or other optical criterion. Such criterion must be more than mere "light diffusing particles" or a "light diffusing surface" to classify a patent in Class 359 as opposed to Class 139 or Class 428. See Class 427, appropriate subclasses for methods of making screens by coating.

(2) Note. The screen may be merely tracing paper or a canvas as in indented subclass 447.

SEE OR SEARCH THIS CLASS, SUBCLASS:

350+, for a viewing screen having infrared or ultraviolet

characteristics.

900, for miscellaneous methods of making screens not classified in Class 427, Coating Processes, or Class 156, Adhesive Bonding and Miscellaneous Chemical Manufacture, etc.

SEE OR SEARCH CLASS 139, Textiles: Weaving,

383+, for light diffusing woven screens.

160, Flexible or Portable Closure, Partition, or Panel, especially

19+, and 371+ for framed screens without optical details other than merely "translucent" or something similar.

248, Supports, especially

158+, for screen supports.

264, Plastic and Nonmetallic Article Shaping or Treating: Processes,

1.1+, for processes directed to forming optical articles capable of producing an optical effect other than mere transparency or planar reflection.

312, Supports: Cabinet Structure,

21+, for screens supported in a cabinet.

352, Optics: Motion Pictures,

61, for a motion picture projector combined with a screen. 353, Optics: Image Projectors,

18, 47, 67, 72+, 74+, and 79+ for cabinet which encloses projector and one side of screen or structurally related projector and screen.

427, Coating Processes,

162+, for coating processes, per se, wherein the product is an optical element.

428, Stock Material or Miscellaneous Articles, especially

143+, for embedded light diffusing particles or for light diffusing stock material in the form of a single or plural layer web or stock material which may be useful for projection purposes.