US Patent No: 5,549,953

Number of patents in Portfolio can not be more than 2000

Optical recording media having optically-variable security properties

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Importance

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Abstract

The prevention of counterfeiting of currencies, passports, cheques, bank cards, credit cards, optical disks and the like is addressed by introducing thin film structures having both optically-variable security properties and encoded optical data decodable by optical means. The thin film structures comprise a substrate and a multilayer interference coating carried by the substrate, producing an inherent color shift with a change of viewing angle. The multilayer interference coating has a dielectric material which is transparent and the recording layer made of a light absorbing material, a crystalline-structural changing material or a magneto-optic material. The encoded data is in the form of bar codes or digital data. The information is encoded by photolithographic means or by optical recording means. The encoded data is retrieved by an optical recording system having a light source and an optical guiding system and a light detector.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
NATIONAL RESEARCH COUNCIL OF CANADAOTTAWA ONTARIO852

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Li, Li Meridian, ID 737 3622

Cited Art

Patent Info (Count) # Cites Year
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (2)
5,147,701 Information recording medium 13 1989
5,154,957 Optical information recording medium 25 1991
 
RICOH COMPANY, LTD. (1)
5,196,250 Optical information recording medium 15 1991

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
JDS UNIPHASE CORPORATION (30)
6,761,959 Diffractive surfaces with color shifting backgrounds 28 1999
6,246,523 Methods of fabricating color shifting thin film pigments 18 2000
6,243,204 Color shifting thin film pigments 32 2000
6,236,510 Color shifting thin film pigments 5 2000
6,692,830 Diffractive pigment flakes and compositions 30 2001
6,749,936 Achromatic multilayer diffractive pigments and foils 23 2001
6,841,238 Chromatic diffractive pigments and foils 30 2002
6,749,777 Diffractive pigment flakes and compositions 28 2002
6,759,097 Methods for producing imaged coated articles by using magnetic pigments 26 2002
6,818,299 Multi-layered magnetic pigments and foils 24 2003
7,169,472 Robust multilayer magnetic pigments and foils 3 2003
6,838,166 Multi-layered magnetic pigments and foils 41 2003
6,987,590 Patterned reflective optical structures 26 2003
7,005,178 Security articles having diffractive surfaces and color shifting backgrounds 6 2003
7,754,112 Methods for forming security articles having diffractive surfaces and color shifting backgrounds 0 2003
7,029,745 Security articles having diffractive surfaces and color shifting backgrounds 4 2003
7,224,528 Optically variable security devices 8 2005
7,645,510 Provision of frames or borders around opaque flakes for covert security applications 0 2005
7,667,895 Patterned structures with optically variable effects 1 2005
8,343,615 Dynamic appearance-changing optical devices (DACOD) printed in a shaped magnetic field including printable fresnel structures 0 2006
7,674,501 Two-step method of coating an article for security printing by application of electric or magnetic field 1 2006
7,630,109 Covert security coating 0 2006
7,625,632 Alignable diffractive pigment flakes and method and apparatus for alignment and images formed therefrom 3 2006
7,876,481 Patterned optical structures with enhanced security feature 0 2006
7,729,026 Security device with metameric features using diffractive pigment flakes 0 2006
7,934,451 Apparatus for orienting magnetic flakes 1 2007
8,118,963 Stamping a coating of cured field aligned special effect flakes and image formed thereby 0 2007
7,550,197 Non-toxic flakes for authentication of pharmaceutical articles 1 2007
7,880,943 Patterned optical structures with enhanced security feature 0 2007
8,025,952 Printed magnetic ink overt security image 1 2007
 
PANASONIC CORPORATION (5)
RE41032 Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk 1 2001
RE40969 Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk 0 2001
RE40687 Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk 1 2001
RE43230 Optical disk including a barcode pattern formed by a laser using pulse width modulation 0 2002
RE41041 Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk 0 2002
 
TRACER DETECTION TECHNOLOGY CORP. (5)
5,974,150 System and method for authentication of goods 170 1998
7,162,035 Authentication method and system 35 2000
7,089,420 Authentication method and system 63 2000
8,171,567 Authentication method and system 1 2003
8,270,603 Authentication method and system 0 2010
 
SPECTRA SYSTEMS CORPORATION (4)
7,220,535 Marking and authenticating articles 7 2002
7,184,569 Marking articles using a covert digitally watermarked image 6 2002
7,393,623 Incorporation of markings in optical media 3 2003
7,529,385 Marking articles using a covert digitally watermarked image 2 2007
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (2)
RE39653 Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk 2 2000
RE39297 Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk 2 2001
 
ROLIC AG (2)
6,734,936 Optical element containing an optically anisotropic layer having at least two regions with different molecular orientations 15 1999
8,111,352 Anisotropic optical device with varying local imagewise and method for making same 1 2005
 
ROLIC LTD C/O ROLIC TECHNOLOGIES LTD (2)
7,292,292 Element for protection against forgery or copying containing a structured retarder and a polarizer layer 1 2006
7,679,701 Optical element 0 2007
 
3M INNOVATIVE PROPERTIES COMPANY (1)
8,120,854 Interference films having acrylamide layer and method of making same 0 2007
 
EASTMAN KODAK COMPANY (1)
6,423,478 Method of forming a watermark image in a hybrid optical master disc 16 2000
 
ESECURE.BIZ, INC. (1)
7,152,047 System and method for production and authentication of original documents 75 2000
 
ESECUREDOCS, INC. (1)
7,080,041 System and method for production and authentication of original documents 81 2004
 
HARRIS CORPORATION (1)
6,888,442 Substrate/document authentication using randomly dispersed dielectric components 2 1998
 
HOLOGRAM INDUSTRIES S.A. (1)
7,875,338 Security protection of documents or products by affixing an optically active component for verification of authenticity 0 2002
 
MICROVENTION, INC. (1)
8,100,935 Embolectomy catheters and methods for treating stroke and other small vessel thromboembolic disorders 0 2007
 
MITSUBISHI KAGAKU MEDIA CO., LTD. (1)
6,707,783 Optical recording medium and recording/erasing method 10 2002
 
SONY CORPORATION (1)
5,904,819 Optical disk and method of manufacturing optical disk 1 1996
 
TAPEMATIC S.P.A. (1)
6,191,384 Apparatus for trimming dye coated on a recordable disc substrate and related method 2 1998
 
TDK CORPORATION (1)
6,929,840 Optical recording medium, method for manufacturing the same and target used for sputtering process 25 2004
 
WEA MANUFACTURING INC. (1)
5,737,298 Holographic security system for optical discs 3 1996
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
6,832,003 Method and apparatus for reading and verifying holograms 3 2003