Title:
Long range image projector
United States Patent 2827831
Inventors:
Herbert, Elion
Thall, Walter H.
Publication Date:
03/25/1958
Export Citation:
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Assignee:
Herbert, Elion
Thall, Walter H.
Primary Class:
353/62
Other Classes:
353/52, 353/102, 362/308
International Classes:
G09F19/18
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US Patent References:
2195392Projection apparatus
2192886Optical system
2165246Apparatus for projecting aerial signs
1989336Optical projection apparatus
1935084Method and apparatus for projecting aerial signs
1815801Light projector
1800211Light-ray-projection apparatus
1788142Projector
1682163N/A
1650591Light projector using fresnel lens
1566260Light-focusing apparatus
1399111Optical-projection lantern
1333304Condensing system for optical projecting apparatus
1333303Condenser