US PATENT SUBCLASS 359 / 885
ABSORPTION FILTER

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

885ABSORPTION FILTER {7}
886  DF  .~> Fluid
887  DF  .~> Sequentially additive
888  DF  .~> Neutral or graded density
889  DF  .~> Movable in or out of optical path
890  DF  .~> Superimposed or series
891  DF  .~> Filters in optical parallel (e.g., colors side-by-side, etc.)
892  DF  .~> With support or frame

DEFINITION

Classification: 359/885

ABSORPTION FILTER:

(under the class definition) Subject matter which absorbs a portion of the incident ray energy and transmits the remainder.

(1) Note. For classification here, some structure other than a material having filtering properties is required. For example, a plurality of superimposed filtering layers which cooperate to give some desired optical effect would be sufficient for classification here. See Class 252, Compositions, subclasses 299.01+ for liquid crystal containing filter compositions and subclasses 582+ for other filter compositions and Class 428, Stock Material or Miscellaneous Articles, for filter stock material.

(2) Note. Included here are not only those devices which may be selective with regard to the visible spectrum (i.e., colored), but also those devices which may be nonselective in the absorption of light energy (i.e., neutral density type).

SEE OR SEARCH THIS CLASS, SUBCLASS:

350+, for filter which operates significantly in the ultraviolet or infrared spectrum; particularly, subclass 358

for fluid filter and subclasses 359+ for multilayer filter.

502, for polarizers combined with color filter means.

577+, for dichroic or interference filter, particularly, subclass 588 for filter having four or more layers and subclass 590 for combining with another filter. 601, for glare reducing means which may include filter means.

722+, for lens having selective wavelength transmitting or blocking properties and subclass 723 for a lens combined with a separate selective element.

884, for mirrors having selective light reflecting properties or combined with elements having such properties.

SEE OR SEARCH CLASS

2, Apparel,

12+, for eye shades which may include a filter.

250, Radiant Energy,

503.1+, for an invisible radiation modifying member generally.

252, Compositions,

299.01+, for liquid-crystal compositions and subclasses 582+ for other optical filter compositions and for optical articles defined only in terms of the composition of which they are composed.

313, Electric Lamp and Discharge Devices,

112, for electric lamps and electronic tubes which have a light filter structurally combined therewith. 333, Wave Transmission Lines and Networks,

167, for electrical filters generally.

343, Communications: Radio Wave Antennas,

909+, for radio wave filters, per se.

351, Optics: Eye Examining, Vision Testing and Correcting,

44+, for spectacles or spectacle type goggles with filtering lenses, and subclasses 163+ for ophthalmic lenses or blanks with light filtering means.

356, Optics: Measuring and Testing, particularly

402+, for shade or color filter devices which use one or more color filters additively or sequentially or at the same time particularly subclasses 234+ and 416+ for photometers of the light absorbing type for neutral filters of the sequentially additive or of the continuously variable type.

362, Illumination, for illuminating devices in combination with a filter,

1+, for daylight lamps; subclasses 3+ for photos:graphic safe light lanterns; subclasses 166+ for signal lanterns with color screens and for hand lanterns with color screens; and subclass 293 for light projectors having a colored light screen.

378, X-Ray or Gamma Ray Systems or Devices, 156+, for X-ray filters.

380, Cryptography,

54, for this subject matter used in a device for revealing concealed information.

396, Photography,

544+, for camera attachments which may include a filter.

424, Drug, Bio-Affecting and Body Treating Compositions,

59+, for a sun or radiation screening or sun tanning composition intented for topical application to a living body.

427, Coating Processes,

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

428, Stock Material or Miscellaneous Articles, appropriate subclasses for a single or plural layer web or sheet which may inherently possess light filtering properties due to the material thereof; coated filters comprising plural layers and defined only by the compositions of the layers are found in Class 428,

411.1+, and especially subclasses 426+ wherein one layer is glass.

430, Radiation Imagery Chemistry: Process, Composition, or Product Thereof, 507, and 510+ for filter.