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Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active, expires Application number US13/148,818 Other versions US20110310404A1 Google Patents Void pantographs and methods for generating the same using at least one test void pantographĭownload PDF Info Publication number US8593698B2 US8593698B2 US13/148,818 US200913148818A US8593698B2 US 8593698 B2 US8593698 B2 US 8593698B2 US 200913148818 A US200913148818 A US 200913148818A US 8593698 B2 US8593698 B2 US 8593698B2 Authority US United States Prior art keywords pantograph void foreground background filter Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US8593698B2 - Void pantographs and methods for generating the same using at least one test void pantograph US8593698B2 - Void pantographs and methods for generating the same using at least one test void pantograph