| | CLASS NOTES |
| 1 | DF | HOLOGRAPHIC SYSTEM OR ELEMENT {16} |
| 107 | DF | OPTICAL COMPUTING WITHOUT DIFFRACTION {1} |
| 109 | DF | OPTICAL COMMUNICATION {13} |
| 196 | DF | DEFLECTION USING A MOVING ELEMENT OR MEDIUM (OFFSETTING OR CHANGING AT LEAST A PORTION OF THE BEAM) {3} |
| 227 | DF | LIGHT CONTROL BY OPAQUE ELEMENT OR MEDIUM MOVABLE IN OR THROUGH LIGHT PATH {6} |
| 237 | DF | OPTICAL MODULATOR {3} |
| 325 | DF | OPTICAL DEMODULATOR |
| 326 | DF | OPTICAL FREQUENCY CONVERTER {5} |
| 333 | DF | OPTICAL AMPLIFIER {11} |
| 350 | DF | HAVING SIGNIFICANT INFRARED OR ULTRAVIOLET PROPERTY {8} |
| 362 | DF | COMPOUND LENS SYSTEM {8} |
| 436 | DF | SCALE OR INDICIA READING {4} |
| 443 | DF | PROJECTION SCREEN {13} |
| 462 | DF | STEREOSCOPIC {3} |
| 478 | DF | RELIEF ILLUSION {1} |
| 480 | DF | BINOCULAR DEVICES {2} |
| 483 | DF | POLARIZATION WITHOUT MODULATION {2} |
| 503 | DF | EXTENDED SPACING STRUCTURE FOR OPTICAL ELEMENTS {3} |
| 507 | DF | PROTECTION FROM MOISTURE OR FOREIGN PARTICLE {6} |
| 515 | DF | SIGNAL REFLECTOR {11} |
| 554 | DF | IMAGE STABILIZATION {2} |
| 558 | DF | DIFFRACTION {3} |
| 577 | DF | LIGHT INTERFERENCE {2} |
| 591 | DF | BUILDING INTERIOR ILLUMINATION WITH REFLECTED, REFRACTED OR PREDETERMINED ANGLE OF ENTRANCE OF OUTSIDE LIGHT {3} |
| 599 | DF | DIFFUSING OF INCIDENT LIGHT |
| 600 | DF | BARREL END EYE GUARD (E.G., SHIELD OR CUSHION, ETC.) |
| 601 | DF | GLARE OR UNWANTED LIGHT REDUCTION {6} |
| 615 | DF | LIGHT DISPERSION |
| 616 | DF | KALEIDOSCOPE {1} |
| 618 | DF | SINGLE CHANNEL SIMULTANEOUSLY TO OR FROM PLURAL CHANNELS (E.G., LIGHT DIVIDING, COMBINING, OR PLURAL IMAGE FORMING, ETC.) {3} |
| 641 | DF | COLLIMATING OF LIGHT BEAM |
| 642 | DF | LENS {32} |
| 831 | DF | PRISM (INCLUDING MOUNT) {3} |
| 838 | DF | MIRROR {14} |
| 885 | DF | ABSORPTION FILTER {7} |
| 893 | DF | SCREEN (E.G., HALFTONE SCREEN, ETC.) |
| 894 | DF | OPTICAL APERTURE OR TUBE, OR TRANSPARENT CLOSURE {1} |
| 896 | DF | MISCELLANEOUS |
| | ****************************** |
| | CROSS-REFERENCE ART COLLECTIONS |
| | ****************************** |
| 900 | DF | METHODS |
| 901 | DF | ACOUSTIC HOLOGRAPHY |
| 902 | DF | HOLOGRAPHIC INTERFEROMETER |
| 903 | DF | WITH MAGNET |
| | ****************************** |
