Screen printed phosphors for intrinsic chip identifiers
US-2018017509-A1 · Jan 18, 2018 · US
Security liquid electrostatic ink composition
US2019018334A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2019018334-A1 |
| Application number | US-201616066145-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 4, 2016 |
| Priority date | Mar 4, 2016 |
| Publication date | Jan 17, 2019 |
| Grant date | — |
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Abstract
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Described herein is a security LEP ink composition comprising an absorber, a resin; and a carrier liquid for printing a security image.
First claim
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1 . A method for printing security information, the method comprising: providing a security liquid electrophotographic (LEP) ink composition comprising: an absorber; a resin; and a carrier liquid; and liquid electrophotographically printing the selected LEP ink onto a print substrate to provide a LEP image on the print substrate which is invisible to the human eye. 2 . A method according to claim 1 , wherein the security LEP ink composition is selected to provide a LEP image detectable at a selected optical signal. 3 . A method according to claim 1 , wherein the LEP ink composition comprises a first absorber and a second absorber and the first and second absorber are selected to determine the optical signal at which the LEP image is detectable. 4 . A method according to claim 1 , wherein the LEP ink composition comprises a first absorber and a second absorber and the ratio of the amount of first absorber to the amount of second absorber is selected to determine the optical signal at which the LEP image is detectable. 5 . A security liquid electrophotographic (LEP) ink composition comprising: an absorber; a resin; and a carrier liquid, wherein the LEP ink is colourless and transparent. 6 . A LEP ink composition according to claim 5 , comprising a first absorber and a second absorber and the first absorber and the second absorber are selected such that the LEP ink composition is detectable at a pre-selected optical signal. 7 . A LEP ink composition according to claim 6 , wherein the ratio of the amount of first absorber to the amount of second absorber is selected such that the LEP ink composition is detectable at a pre-selected optical signal. 1 8 . A LEP ink composition according to claim 5 , wherein the absorber comprises an oxide, oxysulfide, sulfide or combinations thereof. 9 . A LEP ink composition according to claim 5 , wherein the absorber comprises a compound selected from the group comprising alkali metal oxides, sulfides and oxysulfides; alkaline earth metal oxides, sulfides and oxysulfides; transition metal oxides, sulfides and oxysulfides; rare earth oxides, sulfides and oxysulfides; and silicon oxides, sulfides and oxysulfides and combinations thereof. 10 . A LEP ink composition according to claim 5 , wherein the absorber comprises a compound selected from the group comprising yttrium oxysulfide, titanium oxide, potassium sulfide, calcium sulfide, strontium sulfide, ytterbium oxysulfide, ytterbium oxide, lithium sulfide, gadolinium oxysulfide, niobium sulfide 11 . A LEP ink composition according to claim 5 , wherein the absorber is an IR absorber and an IR emitter. 12 . A method for providing a security liquid electrophotographic (LEP) ink composition, the method comprising: selecting an absorber; and combining the absorber with a resin and a carrier liquid, wherein the LEP ink is colourless and transparent and detectable at a selected optical signal. 13 . A method according to claim 12 , wherein the LEP ink composition comprises a first absorber and a second absorber and the first and second absorber are selected such that the LEP ink composition is detectable at a selected optical signal. 14 . A method according to claim 13 , wherein the method comprises selecting the amount of the first absorber in relation to the amount of the second to control the optical signal at which the LEP ink composition is detectable. 15 . A method according to claim 12 , wherein the absorber is an IR absorber and an IR emitter.
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Frequently asked questions
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- What does patent US2019018334A1 cover?
- Described herein is a security LEP ink composition comprising an absorber, a resin; and a carrier liquid for printing a security image.
- Who is the assignee on this patent?
- Hp Indigo Bv
- What technology area does this patent fall under?
- Primary CPC classification G03G9/135. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Jan 17 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).