Invertible display with a kaleidoscope
Patent 5172270 Issued on December 15, 1992. Estimated Expiration Date: 
December 13, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 13, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2423371 2954723 3674333 3748013 3841730 Kaleidoscope Optical image multiplying device Image producing device Liquid kaleidoscope Desktop kinetic display device InventorApplicationNo. 806184 filed on 12/13/1991US Classes:359/617Including particles loosely housed for agitationExaminersPrimary: Wintercorn, Richard A.Attorney, Agent or FirmForeign Patent References
International ClassG02B 023/00AbstractA kaleidoscope utilizing birefringent material in the form of shaped pieces in a liquid with the pieces passing between sheets of polarizing material where the container holding the pieces and liquid is in the form of a tube or tubes, or is flat and elongated, or consists of circular plates held together by a ring, and the container can be inverted or rotated. The shaped pieces will have a higher or lower density than the liquid in which they are immersed, or may be a mixture of both densities and both rise and fall in the container. | |
