Source: http://www.google.es/patents/US8999616
Timestamp: 2017-12-16 09:13:17
Document Index: 757076784

Matched Legal Cases: ['Application No. 60', 'application No. 61', 'Application No. 60', 'Application No. 61', 'Application No. 61', 'Application No. 09152720']

Patente US8999616 - Taggent flakes for covert security applications having a selected shape - Google Patentes
A plurality of flakes are provided that can be used in ink or paint wherein the flakes are of a size that requires magnification to see their shape, in the form of polygons, such as squares, triangle or rectangles. A breaking or grinding process is used to break a foil into these shaped flakes and frames...http://www.google.es/patents/US8999616?utm_source=gb-gplus-sharePatente US8999616 - Taggent flakes for covert security applications having a selected shape
Número de publicación US8999616 B2
Número de solicitud US 14/151,511
Fecha de presentación 9 Ene 2014
También publicado como CN101515124A, EP2090935A1, US8658280, US20090202932, US20120107738, US20140127622
Número de publicación 14151511, 151511, US 8999616 B2, US 8999616B2, US-B2-8999616, US8999616 B2, US8999616B2
Inventores Alberto Argoitia, Cornelis Jan Delst
Citas de patentes (243), Otras citas (41), Clasificaciones (29), Eventos legales (1)
US 8999616 B2
1. A composition comprising a plurality of shaped flakes in an ink for use in an inkjet printer, wherein each flake has a same general polygonal shape, each flake having a thickness greater than or equal to 0.01 μm and less than or equal to 10 μm, and wherein each flake has a remnant in the form of a protruding wall segment on one side of each of the flake wherein the remnant is result of breaking or grinding to form the shaped flakes, and wherein a width of the remnant is less than 20% of a major dimension of the flake so that the general polygonal shape of each flake is distinguishable.
2. A composition as defined in claim 1, wherein one surface of the flake is substantially planar and wherein another opposite surface of the flake is not entirely planar due to the presence of one or more remnants, and wherein the flake is of a size such that the polygonal shape can only be seen with magnification.
3. A composition as defined in claim 2, wherein edges of each of the flakes are jagged as a result of a breaking or grinding process.
5. A as defined in as defined in claim 1, wherein the flakes have indicia thereon.
6. A composition as defined in claim 1, wherein a remnant has a width and length in the plane of the flake, and a height.
7. A composition as defined in claim 1, wherein the shaped flakes comprise bright flakes.
8. A composition as defined in claim 7, wherein the shaped flakes have a grating pattern, the selected shape being visible at a first magnification and the grating pattern not being visible at the first magnification, wherein the grating pattern is visible at a second magnification, the second magnification being greater than the first magnification.
9. A composition as defined in claim 1, wherein the shaped flakes include a grating pattern which can only be seen with magnification.
10. A composition as defined in claim 2, wherein the flakes have a reflective layer, a spacer layer, and an absorber layer.
11. A composition as defined in claim 1, wherein the shaped flakes include single-layer inorganic dielectric taggent flakes.
12. A composition comprising a plurality of shaped flakes for use as toner for a laser printer, wherein each flake has a same general polygonal shape, each flake having a thickness greater than or equal to 0.01 μm and less than or equal to 10 μm, and wherein each flake has a remnant in the form of a protruding wall segment on one side of each of the flake wherein the remnant is result of breaking or grinding to form the shaped flakes, and wherein a width of the remnant is less than 20% of a major dimension of the flake so that the general polygonal shape of each flake is distinguishable.
13. A composition as defined in claim 12, wherein one surface of the flake is substantially planar and wherein another opposite surface of the flake is not entirely planar due to the presence of one or more remnants, and wherein the flake is of a size such that the polygonal shape can only be seen with magnification.
14. A composition as defined in claim 13, wherein edges of each of the flakes are jagged as a result of a breaking or grinding process.
15. A composition as defined in claim 12 comprising a binder.
16. A composition as defined in as defined in claim 12, wherein the flakes have indicia thereon.
17. A composition as defined in claim 12, wherein a remnant has a width and length in the plane of the flake, and a height.
18. A composition as defined in claim 12, wherein the shaped flakes comprise bright flakes.
19. A composition as defined in claim 18, wherein the shaped flakes have a grating pattern, the selected shape being visible at a first magnification and the grating pattern not being visible at the first magnification, wherein the grating pattern is visible at a second magnification, the second magnification being greater than the first magnification.
20. A composition as defined in claim 12, wherein the shaped flakes include a grating pattern which can only be seen with magnification.
21. A composition as defined in claim 13, wherein the flakes have a reflective layer, a spacer layer, and an absorber layer.
22. A composition as defined in claim 13, wherein the shaped flakes include single-layer inorganic dielectric taggent flakes.
The present application is a divisional of U.S. patent application Ser. No. 13/284,689 filed Oct. 28, 2011, which is a continuation-in-part of U.S. patent application Ser. No. 11/931,816 filed Oct. 31, 2007 which is a continuation-in-part U.S. patent application Ser. No. 11/243,122 filed Oct. 4, 2005, now issued U.S. Pat. No. 7,645,510, which claims priority from U.S. Patent Application No. 60/696,593 filed Jul. 5, 2005, and is a continuation-in-part of U.S. patent application Ser. No. 10/762,158 filed Jan. 20, 2004, now issued U.S. Pat. No. 7,241,489, which is a continuation-in-part of U.S. patent application Ser. No. 10/641,695, filed Aug. 14, 2003, now issued U.S. Pat. No. 7,258,915, and which is also a continuation-in-part of U.S. patent application Ser. No. 10/243,111 filed Sep. 13, 2002, now issued U.S. Pat. No. 6,902,807, the disclosures of which are hereby incorporated in their entirety for all purposes.
U.S. patent application Ser. No. 13/284,689 filed Oct. 28, 2011 is a continuation-in-part of U.S. patent application Ser. No. 12/463,114 filed May 8, 2009, claims priority from U.S. provisional patent application No. 61/051,463 filed May 8, 2008, and is a continuation-in-part of U.S. patent application Ser. No. 11/243,122 filed Oct. 4, 2005, now issued U.S. Pat. No. 7,645,510, which claims priority from U.S. Patent Application No. 60/696,593 filed Jul. 5, 2005, and is a continuation-in-part of U.S. patent application Ser. No. 10/762,158 filed Jan. 20, 2004, now issued U.S. Pat. No. 7,241,489, which is a continuation-in-part of U.S. patent application Ser. No. 10/641,695 filed Aug. 14, 2003, now issued U.S. Pat. No. 7,258,915, and also is a continuation-in-part of U.S. patent application Ser. No. 10/243,111 filed Sep. 13, 2002, now issued U.S. Pat. No. 6,902,807, the disclosures of which are incorporated herein by reference for all purposes.
U.S. patent application Ser. No. 13/284,689 filed Oct. 28, 2011 is a continuation-in-part of U.S. patent application Ser. No. 12/938,304 filed Nov. 2, 2010, which claims priority from U.S. Provisional Patent Application No. 61/257,664 filed Nov. 3, 2009, which are incorporated herein by reference for all purposes.
U.S. patent application Ser. No. 13/284,689 filed Oct. 28, 2011 is a continuation-in-part of U.S. patent application Ser. No. 12/378,371 filed Feb. 13, 2009, which claims priority from U.S. Patent Application No. 61/028,442 filed Feb. 13, 2008, which are incorporated herein by reference for all purposes.
Another aspect of this invention relates to providing flakes which have taggents or covert symbols stamped or embossed or etched therein by mechanical means or formed by laser means, wherein the covert symbols can be seen with a microscope. In order to preserve the integrity of the symbols, a frame is provided around all of or part of covert symbols so that when the individual flakes are removed from the support structure they are deposited on, the majority of flakes break along the frame lines provided instead of breaking in a less controlled unpredictable manner wherein break lines would otherwise occur with greater frequency through and about the symbols. In some instances parallel frame lines may be provided so that the flakes break into a ribbon; in a preferred embodiment of this invention, flakes and more particularly one or more symbols within a flake will have a framed grooved border on four or fewer sides about the one or more symbols, so that the flakes break in uniform squares or rectangles along the fame lines. Of course triangular or hexagonal flakes may be provided as well in this manner, by pre-framing symbols on three sides, prior to removing the flakes from their backing. A conventional release layer is provided so that the flakes can easily be removed from their backing or support layer and so that upon removal, the flakes break up along the faming lines. Frames can be made in a similar manner in which the symbols are made; using a laser, etching or stamping of the film that is upon the substrate; in a preferred embodiment, the frames are provided in the same process along with the formation of the symbols.
In accordance with this invention a plurality of shaped covert flakes are provided which may carry a symbol or indicia thereon which cannot be seen without magnification. As a result of the way in which the flakes are broken or ground so as to provide preferred shaped flakes, remnants of frames, or walls are present due to breaking up the foil into individual flakes. By using this method and by providing a structure around the flake region such as a frame or border, there also exists enough control so that the flakes have predetermined polygon shapes. Of course these remnants are evidence of a coarse breaking or grinding process however, the cost benefit of producing flakes in this manner over the resultant remnants being present makes this process desirable commercially. It is not necessary that flakes edges be absolutely straight lines without these small remnants After all, the shape of these very small flakes can only be seen with adequate magnification and therefore these jagged remnants which comprise a very small percentage of the flake are barely noticeable with just enough magnification to discern the shape of the flake.
FIG. 2B is a simplified view of a portion of another deposition substrate 11′ having an embossed portion 13′ and a non-embossed portion 15′.
FIG. 1 is a plan view of a portion of a document 10 with a security feature 12 according to an embodiment of the present invention. At least a portion 14 of the security feature 12 is printed with ink or paint including opaque flakes having indicia (hereinafter “covert flakes”) mixed with bulk pigment, such as bulk pigment flakes. In one embodiment, the covert flakes have a particular shape, such as being square, rectangular, trapezoidal, “diamond” shaped, or round, for example. In another embodiment, the covert flakes include a grating pattern, with or without having a selected shape. Preferably, the selected shape is provided by embossing, etching or using a laser to create frames or borders along which the flakes will fracture upon removal from their temporary supporting substrate. In a particular embodiment, the grating pattern has a grating spacing that is not optically active in the visible range of the spectrum. That is, these grating patterns do not form a visible diffraction grating. Covert flakes are also sometimes referred to as taggent flakes, although not all taggent flakes are necessarily covert flakes.
Pigments are often mixed in carriers to form paint or ink. Examples of carriers include polyvinyl alcohol, polyvinyl acetate polyvinylpyrrolidone, poly(ethoxyethylene), poly(methoxyethylene), poly(acrylic)acid, poly(acrylamide), poly(oxyethylene), poly(maleic anhydride), hydroxyethyl cellulose, cellulose acetate, poly(saccharides) such as gum arabic and pectin, poly(acetals) such as polyvinylbutyral, poly(vinyl halides) such as polyvinyl chloride and polyvinylene chloride, poly(dienes) such as polybutadiene, poly(alkenes) such as polyethylene, poly(acrylates) such as polymethyl acrylate, poly(methacrylates) such as poly methylmethacrylate, poly(carbonates) such as poly(oxycarbonyl oxyhexamethylene, poly(esters) such as polyethylene terephthalate, poly(urethanes), poly(siloxanes), poly(suphides), poly(sulphones), poly(vinylnitriles), poly(acrylonitriles), poly(styrene), poly(phenylenes) such as poly(2,5 dihydroxy-1,4-phenyleneethylene), poly(amides), natural rubbers, formaldahyde resins, other polymers and mixtures of polymers and polymers with solvents.
The elemental indicator layer 28 is not optically active because it is between the two opaque reflective layers 22′, 22″. The reflective layers 22′, 22″ are selected to be of the same material used in the base flake, such as aluminum. Suitable materials for an elemental indicator include platinum, iridium, osmium, vanadium, cobalt, and tungsten, among others. Those of skill in the art appreciate that the elemental indicator material chosen depends on the base pigment it will be used with. In an alternative embodiment, the reflective layer of bright pigment is of an elemental indicator material (see FIG. 3B, ref. num. 22). For example, covert bright or colored pigment flake using platinum as the reflective layer is mixed with base bright flake or colored pigment flake using aluminum as the reflective layer. In a further embodiment, the amount of flake having the elemental indicator incorporated into a pigment mixture or composition is chosen to provide a selected elemental ratio (e.g. aluminum to platinum) in the pigment mixture. In an alternative or further embodiment, the material of the dielectric thin-film layers 24′, 26′ (FIG. 3B, ref nums. 24, 26) is chosen to provide an elemental indicator.
The color and color travel of the color-shifting pigment flake is determined by the optical design of the flake, namely the material and thicknesses of the layers in the thin film stack 32, as is well-known in the art of optically variable pigments. The optical design of the color-shifting pigment flake 30 is typically chosen to match the optical properties of the base pigment flake that it will be mixed with. The color-shifting pigment flake 30 is shaped (see FIG. 3A, ref num. 18), and optionally or alternatively includes other indicia, such as a surface grating pattern and/or elemental indicator.
For example, the reflective layer includes an elemental indicator, either a reflective metal that is different than the base pigment flakes, or includes an additional elemental indicator layer(s), which may or may not be optically active (see FIG. 3C, ref num. 28). Alternatively or additionally, the spacer layers 36A, 36B and/or the absorber layers 38A, 38B include an elemental indicator. For example, if the base pigment flake uses MgF2, SiO2, or Al2O3 as a spacer layer material, the covert pigment flake 30 uses different spacer layer material, such as TiO2 or ZnS. Spacer and/or absorber indicator materials include elements that are easily detected using elemental analysis.
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Clasificación de EE.UU. 430/108.1, 430/115, 430/112, 430/108.6
Clasificación internacional G03G9/083, G03G9/09, G03G9/06, C09D11/322, G03G9/08, C09C1/00, G03G9/12, G03G9/097, G03G9/087
Clasificación cooperativa Y10T428/2982, G03G9/0825, G03G9/0926, C01P2004/03, G03G9/08797, G03G9/09708, C09D11/322, C09C2210/60, C01P2004/62, C01P2004/61, G03G9/09716, C09C1/0015, C01P2006/60, G03G9/08795, G03G9/0902, G03G9/0837
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ARGOITIA, ALBERTO;DELST, CORNELIS JAN;REEL/FRAME:031932/0316