Method of manufacturing an optical interference authenticating d

Coating processes – Fraud or tamper detecting

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

283 91, 283 94, 427 531, 428333, B41M 314

Patent

active

046264450

ABSTRACT:
Hard to simulate, readily distinguishable from counterfeits, optical interference authenticating devices are provided by depositing two coatings on a substrate, each coating comprising at least one optical interference layer, the material of each layer being selected so that the two coatings together and separately have different spectral reflectance and spectral transmittance characteristics at different angles of incidence of light thereon. The substrate may be, for example, a polyester film and a first one of the coatings is sufficiently radiation absorbing of, say, infrared radiation that at least one portion of that coating can be removed by an infrared laser beam through, for example, a mask to provide a readily distinguishable pattern on the substrate. The first coating may be, for example, a multilayer absorber coating containing Inconel, aluminum or some other suitable material, while the other coating, which is insufficiently radiation absorbing by, for example, infrared radiation to be substantially resistant to excavation solely by the infrared laser beam may be, for example, a multilayer coating of ZrO.sub.2 or SiO.sub.2, etc. If the first coating is outermost from the substrate then only the first coating will be excavated by the infrared laser beam. If the second coating is outermost from the substrate then both the first and second coatings will be excavated by the infrared laser beam.

REFERENCES:
patent: 2100840 (1937-11-01), Elmore
patent: 3897964 (1975-08-01), Oka et al.
patent: 3919447 (1975-11-01), Kilmer
patent: 4304809 (1981-12-01), Moraw et al.
patent: 4519632 (1985-05-01), Parkinson et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method of manufacturing an optical interference authenticating d does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of manufacturing an optical interference authenticating d, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing an optical interference authenticating d will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2291968

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.