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:
Mar. 16, 1976
Filed:
May. 14, 1973
Harvey H Wacks, Southfield, MI (US);
Energy Conversion Devices, Inc., Troy, MI (US);
Abstract
Apparatus for producing microfilm which, in its preferred form, comprises xerographic reproduction apparatus responsive to printed document reflectable radiation produces on an endless image projection member a removable image opaque to a given radiant energy. Radiant energy is momentarily projected through the member and a high reduction lens system upon a grainless photosensitive microform material. The photosensitive microform material most advantageously comprises an etch-resistant transparent substrate having a film of an etchable metal or metallike image-forming material, in turn, having a film of a photosensitive material which becomes chemically transformed by exposure to said radiant energy to form or leave on the exposed or unexposed areas thereof a material removable or permeable by an etchant which removes the image-forming layer therebeneath, and on the other of same a material which is not removed or permeable by the etchant. The etching process, which need take only less than one second, may be followed by an instant wash and hot air blast, to provide a dry microfilm having unusually high acuity, contrast and resolution, and excellent archival properties.