Optical path monitoring circuit for a document scanner
Patent 4356390 Issued on October 26, 1982. Estimated Expiration Date: 
March 11, 2001. 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 11, 2001. 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 References3747066 InventorAssigneeApplicationNo. 06/242755 filed on 03/11/1981US Classes:235/455, Light level control235/435, CODED RECORD SENSORS382/323Single lineExaminersPrimary: Pitts, Harold I.Attorney, Agent or FirmInternational ClassG06K 9/20 (20060101)AbstractThe light levels reflected from a predetermined blank portion of an optically scanned document are monitored. The presence of dirt or smudges in the optical path which could adversely affect the validity of the information read from the document. | |
