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US Patent 4980569 - Security paper verification device
US Patent Issued on December 25, 1990
Estimated Patent Expiration Date:
March 5, 2010Estimated 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.
Estimated Patent Expiration Date:
March 5, 2010Estimated 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.AbstractA 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. | InventorsApplicationNo. 488230 filed on 03/05/1990US Classes:250/556, Document verification or graph reader283/85, Utilizing electromagnetic radiation356/71DOCUMENT PATTERN ANALYSIS OR VERIFICATIONField of Search250/556, Document verification or graph reader283/85, Utilizing electromagnetic radiation283/91, Specific spectral transmittance or reflectance356/61Portable receptaclesExaminersPrimary: Westin, Edward P.US Patent References4370057, Method of verification of a sheet element, such as a banknoteIssued on: 01/25/1983 Inventor: Lee4451530, Security paper with authenticity features in the form of luminescing substances Issued on: 05/29/1984 Inventor: Kaule , et al.4524276, Apparatus for detecting a security thread embedded in a paper-like material Issued on: 06/18/1985 Inventor: Ohtombe4652015, Security paper for currency and banknotes Issued on: 03/24/1987 Inventor: Crane4723072, Apparatus for discriminating sheets Issued on: 02/02/1988 Inventor: Naruse4761205Security paper for currency and banknotes Issued on: 08/02/1988 Inventor: Crane International ClassG06K 005/00 |
