The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 1977
Filed:
Sep. 12, 1975
Bryan L Klaenhammer, Hugo, MN (US);
William H Long, Woodbury, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A reflecting device providing a flashing reflection of light incident on the device toward an intended observer includes a converging Fresnel lens for receiving light directed onto the device and for focusing the light within the focal plane of the lens, through which plane a reflector is periodically moved to intermittently reflect the light. In one embodiment, the reflector is positioned to retroreflect the light back through the lens toward an observer positioned adjacent the source of light. In another embodiment, the reflector is positioned to reflect light transmitted through a first Fresnel lens toward another Fresnel lens so as to be visible by an observer of the other lens.