Bridged diarylpolymethine chromophores

• US 7,094,910 B2
• Filed: 08/10/2001
• Issued: 08/22/2006
• Est. Priority Date: 05/25/1999
• Status: Expired due to Fees

• Current Assignee: Silverbrook Research Pty Limited
• Original Assignee: Silverbrook Research Pty Limited
• Inventors: Hall, Lachlan Everett, Silverbrook, Kia
• Primary Examiner(s): POWERS, FIONA
• Application Number:
  US09/928,055
• Publication Number:
  US 20020095733A1
• Time in Patent Office: 1,838 Days
• Field of Search: 549/26, 549/388, 549/394, 549/398, 106/31.27, 106/31.58
• US Class Current: 549/26
• CPC Class Codes: B41J 2/17513 Inner structure
• CPC Class Codes: B41J 2/17523 Ink connection
• CPC Class Codes: B41J 2/17546 electronically
• CPC Class Codes: C09D 11/328 characterised by dyes
• CPC Class Codes: C09D 11/50 Sympathetic, colour changing or similar inks
• CPC Class Codes: H04N 1/00358 Type of the scanned marks
• CPC Class Codes: H04N 1/00376 Means for identifying a mark sheet or area
• CPC Class Codes: H04N 1/32101 Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
• CPC Class Codes: H04N 1/32128 attached to the image data, e.g. file header, transmitted message header, information on the same page or in the same computer file as the image for information embedded in the image H04N1/32144
• CPC Class Codes: H04N 1/32771 in response to a request, e.g. for a particular document
• CPC Class Codes: H04N 1/32778 using a mark-sheet or machine-readable code request
• CPC Class Codes: H04N 2201/3205 of identification information, e.g. name or ID code H04N2201/3209 takes precedence
• CPC Class Codes: H04N 2201/3207 of an address
• CPC Class Codes: H04N 2201/3226 of identification information or the like, e.g. ID code, index, title, part of an image, reduced-size image
• CPC Class Codes: H04N 2201/3242 of processing required or performed, e.g. for reproduction or before recording H04N2201/3256 and subgroups take precedence
• CPC Class Codes: H04N 2201/327 which are undetectable to the naked eye, e.g. embedded codes
• CPC Class Codes: H04N 2201/3271 Printing or stamping
• CPC Class Codes: H04N 2201/3278 Transmission

Abstract

An infrared dye, characterised in that the dye comprises two bridged diarylpolymethine type dyes or derivatives thereof connected together at either the 3, 4, 5 or 6 position by a central moiety such that the two dyes are located on each side of the central moiety, wherein the infrared dye absorbs strongly in the near infrared region of the spectrum but poorly in the visible region of the spectrum.

Claims

1. An infrared dye of formula 4 as set out hereunder:

2. An infrared dye according to claim 1 selected from:

3. An infrared absorbing compound according to claim 1 wherein one or more polar group substituents such as —

SO₃H, —

NH₂ and —

CN are utilized.

4. An infrared printing ink comprising a colorant, wherein the colorant is a dye in accordance with claim 1.

5. An infrared printing ink according to claim 3 which is suitable for ink jet printing ink or offset printing.