Hand held bar code reader with constant linear amplifier output
Patent 3949233 Issued on April 6, 1976. Estimated Expiration Date: 
April 6, 1993. 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.
April 6, 1993. 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 3560751 3670202 3770967 3813540 3820068 InventorApplicationNo. 497538 filed on 08/15/1974US Classes:250/555, Including coded record235/462.26, Amplitude control (e.g., automatic gain control)235/462.45, Hand-held (e.g., portable)250/206, Photocell controlled circuit327/187, External effect device (e.g., light, heat, magnetic, or mechanical force sensitive devices, etc.)327/312By feedback limiting-clampingExaminersPrimary: Stolwein, WalterAttorney, Agent or FirmInternational ClassG06K 7/10 (20060101)AbstractA linear direct current amplifier with automatic gain control system for regulating the peak-to-peak amplitude of the signal output that is acquired by scanning a coded label with a hand-held photo optical scanner is disclosed. The gain is set primarily by the white background on the coded label and it is further adjusted at the black bar as the pen passes over the label surface on which the code is imprinted. Control circuit feedback compensates for input amplitude and contrast variations.Other References
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