Ink and method of conducting an examination

Patent metadata

Field	Value
Publication number	US-10513621-B2
Application number	US-201615552832-A
Country	US
Kind code	B2
Filing date	Feb 29, 2016
Priority date	Feb 27, 2015
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

An ink and method of conducting an examination suitable for reducing the likelihood that the students' answers on paper-based examinations may be changed at a later time prior to being graded. The ink includes a solution of marking particles, a suspension material, and a preserving material. A mark made with the ink is initially erasable for a predetermined period of time after the mark is formed and after the expiration of the predetermined period of time the mark is not erasable. The method of conducting an examination includes providing an ink to an individual, and then providing questions to an individual wherein the individual indicates answers to the questions by producing marks with the ink.

First claim

The invention claimed is:

1. An ink having a composition comprising: a solution comprising marking particles, a suspension material, and a preserving material, wherein the marking particles comprise mesoporous carbon nanopowder, wherein a mark made with the ink is initially erasable for a predetermined period of time after the mark is formed and after the expiration of the predetermined period of time the mark is not erasable.

2. The ink of claim 1 , wherein the preserving material reduces or eliminates the ability of a mark to be erased after the predetermined period of time.

3. The ink of claim 1 , wherein the suspension material comprises acetone, or a combination of acetone and either isopropyl alcohol or ethylene glycol.

4. The ink of claim 1 , wherein the preserving material is an epoxy.

5. The ink of claim 1 , wherein the preserving material comprises a combination of 4,4′-methylenebis(phenyl isocyanate) and p-toluenesulfonyl isocyanate.

6. The ink of claim 1 , wherein the solution comprises mesoporous carbon as the marking material, acetone as the suspension material, and a combination of 4,4′-methylenebis(phenyl isocyanate) and p-toluenesulfonyl isocyanate as the preserving material.

7. A delivery device for forming marks with the ink of claim 1 .

8. A method of using the ink of claim 1 , the method comprising: providing the ink to an individual; and then conducting an examination wherein the individual indicates answers to the examination by producing marks with the ink.

9. The method of claim 8 , further comprising: producing the ink prior to providing the ink to the individual such the predetermined period of time is based on an amount of time allowed for the completion of the examination.

10. The method of claim 8 , further comprising: grading the examination by scanning the marks with an automated grading system after the individual produces the marks.

11. A method of conducting an examination, the method comprising: providing an ink to an individual; and then providing questions to the individual wherein the individual indicates answers to the questions by producing marks with the ink; wherein the marks made with the ink are initially erasable for a predetermined period of time after the marks are formed and after the expiration of the predetermined period of time the marks are not erasable, wherein the ink comprises a composition comprising a solution that comprises marking particles, a suspension material, and a preserving material, wherein the marking particles comprise mesoporous carbon nanopowder.

12. The method of claim 11 , further comprising: grading the examination by scanning the marks with an automated grading system after the individual produces the marks.

13. The method of claim 11 , further comprising: producing the ink prior to providing the ink to the individual such the predetermined period of time is based on an amount of time allowed for the completion of the examination.

14. The method of claim 11 , further comprising: producing the ink to comprise a solution of at least marking particles, a suspension material, and a preserving material, wherein the preserving material reduces or eliminates the ability of the marks to be erased after the predetermined period of time.

15. The method of claim 14 , wherein the suspension material comprises acetone, or a combination of acetone and either isopropyl alcohol or ethylene glycol.

16. The method of claim 14 , wherein the preserving material comprises 4,4′-methylenebis(phenyl isocyanate) and p-toluenesulfonyl isocyanate.

17. The method of claim 14 , wherein the solution comprises comprises mesoporous carbon as the marking material, acetone as the suspension material, and a combination of 4,4′-methylenebis(phenyl isocyanate) and p-toluenesulfonyl isocyanate as the preserving material.

Assignees

• Purdue Research Foundation

Inventors

• Boudouris Bryan William
• Dodd Robert Randell
• Sargent Jessica L
• Alcorace Emily

Classifications

• B43K8/04

  Arrangements for feeding ink to writing-points · CPC title

• C09D11/17 Primary

  characterised by colouring agents · CPC title

• C09D11/20

  indelible · CPC title

• B43K8/06

  Wick feed from within reservoir to writing-points · CPC title

• C09D11/16

  Writing inks · CPC title