US PATENT SUBCLASS 349 / 117
.~.~ Compensator or retarder (i.e., not using liquid crystal cell)

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

Internet Version by PATENTEC © 1999      Terms of Use


349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

56  DF  PARTICULAR STRUCTURE {7}
84  DF  .~ Having significant detail of cell structure only {17}
117.~.~ Compensator or retarder (i.e., not using liquid crystal cell) {3}
118  DF  .~.~.~> With refractive indices in the x, y, and z directions
119  DF  .~.~.~> Multiple compensators {1}
121  DF  .~.~.~> With particular non-zero angle between compensator optical axis and orientation direction

DEFINITION

Classification: 349/117

Compensator or retarder (i.e., not using liquid crystal cell):

(under subclass 84) Subject matter including an element which modifies relative velocity between two light rays.

(1) Note. Included here are quarter-wave and half-wave plates and birefringent layers.

(2) Note. Excluded from this subclass are compensators formed of liquid crystal cells. For such excluded subject matter, see SEARCH THIS CLASS, SUBCLASS below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

75, and 76, for compensators formed of liquid crystal cells.