Process for checking the authenticity of documents as well as apparatus therefor
Patent 4634872 Issued on January 6, 1987. Estimated Expiration Date: 
March 2, 2004. 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.
March 2, 2004. 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 2059197 2099012 3842281 InventorsAssigneeApplicationNo. 06/585476 filed on 03/02/1984US Classes:250/458.1, LUMINOPHOR IRRADIATION250/461.1, With ultraviolet source250/472.1INVISIBLE RADIATION RESPONSIVE NONELECTRIC SIGNALLINGExaminersPrimary: Howell, Daniel W.Attorney, Agent or FirmInternational ClassesG07D 7/12 (20060101)G07D 7/00 (20060101) Foreign Application Priority Data1983-03-03 NLAbstractProcess and apparatus for checking the authenticity of valuable documents by subjecting the document to be checked in a closed room to at least incident light, transmitting and floodlight, especially floodlight at angles of 0 tot 15°. Apparatus is described with document examination places without relative interference of the different radiation. | |
