The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 26, 1977
Filed:
Jan. 29, 1976
Giancarlo Punis, Sicklerville, NJ (US);
Metrologic Instruments, Inc., Bellmawr, NJ (US);
Abstract
Laser light scattered from a UPC symbol on a moving web is detected by a photomultiplier, and detection threshold levels and print contrast signals are developed on a time varying analog basis. Since the reflected light includes an ambient component, the 'white' and 'dark' logical thresholds are developed based on the voltage levels of peak above zero, white to dark as a time variant function, and respective maximum values thereof. When a valid UPC signal is detected, present signal parameters develop print contrast (i.e., white minus dark/white) and produce a gate pulse having a duration proportional to that ratio.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile