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Class Information
Number: 33/269
Name: Geometrical instruments > Straight-line light ray type > Celestial > Time computing
Description: Device including means whereby the time of day may be determined.

Sub-classes under this class:

Class Number Class Name Patents
33/270 Including gnomonic indicator (e.g., sundial, etc.) 63

Patents under this class:

Patent Number Title Of Patent Date Issued
8065808 Sundial with dome and grid of light Nov. 29, 2011
7698825 Automatic solar compass Apr. 20, 2010
7555840 Omni-directional lens in sundials and solar compasses Jul. 7, 2009
7197381 Navigational system and method utilizing sources of pulsed celestial radiation Mar. 27, 2007
6680877 Solar night splitter and event timer Jan. 20, 2004
6625085 Universal timepiece from which latitude and longitude can be determined Sep. 23, 2003
6612041 Diurnal solar event triggering mechanism Sep. 2, 2003
5701678 Space-time tracker Dec. 30, 1997
5269065 Compass including means for displaying constellation data Dec. 14, 1993
5253225 Compass watch of the mechanically or electromechanically driven type and bezel specifically intended for such a watch Oct. 12, 1993
5197199 Reflected spot sundial Mar. 30, 1993
5056232 Remote light source responsive visual time indicator Oct. 15, 1991
4945644 Hemispherical sundial with installation indicia Aug. 7, 1990
4899451 Solar compass and time indicator device Feb. 13, 1990
4512085 Method of and apparatus for telling time at night Apr. 23, 1985
4457296 Heating model Jul. 3, 1984
4346521 Modern sundial Aug. 31, 1982
4338727 Shadowless sundial Jul. 13, 1982
4136397 Astronomical timepiece Jan. 23, 1979

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