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US 4,786,941 AGranted
Method of protection of confidential documents
AssigneeEastman Kodak Company
InventorMichael T. Regan
Life of this patent
Estimating the term…
Abstract
Two or more copies of a document are made with complementary portions missing for separate secure transporting or storing. The copies may be made on an electrostatic copies having an image erase feature or on a printer which can impress an erase signal on the printing signal.
Claims3
A method of rendering a document unintelligible to the casual observer for purposes of transportation, storage or the like, comprising the steps of:
- imagewise exposing a charged photoconductor to produce at least two electrostatic images of said document
- in a step separate from said exposing step exposing the respective image portions of said photoconductor to complementary patterns of erasing radiation to erase complementary portions of said images in a pattern making each image separately unintelligible, and
- producing a visible image corresponding to each of said unintelligible electrostatic images.
Dependencies are inferred from the claim text.