Security paper verification device
Patent 4980569 Issued on December 25, 1990. Estimated Expiration Date: 
March 5, 2010. 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 5, 2010. 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 ReferencesMethod of verification of a sheet element, such as a banknote Security paper with authenticity features in the form of luminescing substances Apparatus for detecting a security thread embedded in a paper-like material Security paper for currency and banknotes Apparatus for discriminating sheets Security paper for currency and banknotes Patent #: 4761205 InventorsApplicationNo. 488230 filed on 03/05/1990US Classes:250/556, Document verification or graph reader283/85, Utilizing electromagnetic radiation356/71DOCUMENT PATTERN ANALYSIS OR VERIFICATIONExaminersPrimary: Westin, Edward P.International ClassG06K 005/00AbstractA photodiode and phototransistor are positioned on one side of a document subjected to verification for authenticity under both transmitted and reflected light. A corresponding photodiode and phototransistor on the opposite side of the document are arranged for receiving the light transmitted through the currency if the security feature is not present. A logic circuit determines the presence or absence of the security feature and correspondingly provides visual or audible indication thereof. The photodiodes, phototransistors and circuit are arranged within an enclosure that is attached to a currency receiving device such as a cash register. The visual or audible indicators are mounted on the cash register for immediate indication of the currency verification to the cashier. | |
