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:
Jun. 16, 1992
Filed:
Mar. 05, 1990
Mark Jones, Lakewood, CO (US);
Robert MacRury, Denver, CO (US);
Other;
Abstract
A masking device is provided for use with projectors, such as an overhead projector, to selectively block the projection beam that carries an image disposed on a substrate, such as a transparency, for projection onto a viewing screen. The masking device has a framework having preferably guide rails that form slideways receiving a shutter panel. A transparency is aligned by the guide rails and the shutter panel has a leading edge that extends transversely across the aligned transparency so that only the image portion forward of the leading edge is projected. The shutter panel is constructed of a material that inhibits the projectiton beam, but allows the projection to read or view the image portion that is blocked. A base plate of transparent material supports the guide rails and provides a stage on which the transparency may be positioned for projection of the image disposed thereon. Adjustably mounts to retro-fit the masking device on various projectors is described, but the device could be made integrally with the projector.