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US 4,652,015 AGranted
Security paper for currency and banknotes
AssigneeCrane Co.
InventorTimothy T. Crane
Life of this patent
Estimating the term…
Abstract
Security devices in the form of metalized plastic films are incorporated within a security paper such as banknotes and other valuable documents during the papermaking process for viewing solely by means of transmitted light. The devices comprise printing of extreme fine line clarity and high opacity such that legibility is possible by means of transmitted light while remaining completely indiscernable under reflected light.
Claims4
Security paper comprising:
- a rectangular sheet of paper having first and second opposing planar surfaces defining a paper thickness and a paper length, said paper thickness being uniform along said paper length;
- printed indicia legible on both said surfaces under reflective illumination for identifying the subject of said paper;
- and
- security indicia comprising metal characters on a plastic strip intermediate said first and second surfaces providing authenticity to said paper, said metal characters being undetectable to the unaided eye under reflective illumination while becoming legible in transmitted illumination through both said surfaces.
1 more element
Dependencies are inferred from the claim text.