Process for the authentication of documents utilizing encapsulated toners

• US 5,208,630 A
• Filed: 11/04/1991
• Issued: 05/04/1993
• Est. Priority Date: 11/04/1991
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Wong, Raymond W., Duff, James M., Goodbrand, H. Bruce
• Primary Examiner(s): Grimley, A. T.
• Assistant Examiner(s): Brase, Sandra L.
• Application Number:
  US07/787,470
• Time in Patent Office: 547 Days
• Field of Search: 355/201, 355/77, 355/133, 355/27, 430/109, 430/137, 430/138, 430/616, 380/54, 380/55, 283/73, 283/902
• US Class Current: 399/15
• CPC Class Codes: G03G 21/04 Preventing copies being made of an original
• CPC Class Codes: G03G 9/0926 characterised by physical or chemical properties
• CPC Class Codes: G03G 9/093 Encapsulated toner particles

Abstract

A process for the authentication of documents which comprises generating developed documents in an electophotographic apparatus, or in a laser printer, with an encapsulated toner comprised of a core comprised of polymer, pigment, and an infrared absorbing component, and thereover a polymeric shell; and subjecting the document to an infrared reader whereby the near infrared absorbing component is detected spectroscopically.

Claims

1. A process for the authentication of documents which comprises generating developed documents in an electrophotographic apparatus, or in a laser printer, with an encapsulated toner comprised of a core comprised of polymer, pigment, and an infrared absorbing component, and thereover a polymeric shell;

and subjecting said documents to an infrared reader whereby said infrared absorbing component is detected spectroscopically.

2. A process for avoiding the copy of documents which comprises generating said documents entirely or in selected areas with an encapsulated toner comprised of a core comprised of polymer, pigment, and an infrared absorbing component, and thereover a polymeric shell, and thereafter scanning the reflected light from said documents whereby there is detected spectroscopically said infrared absorbing component.

3. A process for determining the authentication of documents comprised of a supporting substrate and developed images thereover which comprises generating documents in an electrophotographic apparatus, wherein latent images are initially formed followed by development with an encapsulated toner comprised of a core comprised of a polymer, pigment particles, and an infrared absorbing component, and thereover a polymeric shell;

transferring the images developed to a supporting substrate, and fusing the images thereto; and

subjecting said documents comprised of said supporting substrate and developed images thereover formed to an infrared reader whereby said infrared absorbing component is detected spectroscopically.