Guidepath material

• US 5,277,839 A
• Filed: 06/03/1992
• Issued: 01/11/1994
• Est. Priority Date: 06/03/1992
• Status: Expired due to Fees

• Current Assignee: Saurer Automation Systems, Inc.
• Original Assignee: Litton Industrial Automation Automated Vehicles
• Inventors: Schultz, Selwyn
• Primary Examiner(s): McAvoy, Ellen M.
• Application Number:
  US07/892,961
• Time in Patent Office: 587 Days
• Field of Search: 252/301.16, 252/301.34, 252/301.35, 252/301.24
• US Class Current: 252/301.24
• CPC Class Codes: C09D 5/22 Luminous paints luminescent compositions C09K11/00
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: D06P 1/0012 Effecting dyeing to obtain luminescent or phosphorescent dyeings
• CPC Class Codes: G05D 1/0234 using optical markers or beacons optical beacons per se G01S1/70
• CPC Class Codes: G05D 1/0242 using non-visible light signals, e.g. IR or UV signals

Abstract

A dispersion or solution of a fluorescent dye material which emits radiation for detection by automated guidance vehicles (AGV) including a sulfonated fluorescent dye solution in its acid state. The unique product forms a guidepath on a carpet which requires little or no maintenance. The product will cause no carpet discoloration or will it be affected by extended exposure to sunlight.

Claims

1. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles comprising a dispersion or solution of a luminescent dye compound in its acid state.

2. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 1, wherein said dispersion or solution is aqueous with an adjusted pH below 4.0.

3. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 2, wherein said adjusted pH of said dispersion is below 2.0.

4. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 2, wherein said luminescent dye compound is sulfonated.

5. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 4, wherein said sulfonated luminescent dye compound is dissolved in a solvent selected from the group consisting of water, ethanol, methanol, propanol, isopropanol and mixtures thereof.

6. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 4, further comprising a surface active agent.

7. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 4, further comprising a pH adjuster selected from the group consisting of hydrochloric acid, methane sulfonic acid, sulfuric acid and phosphoric acid.

8. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 4, wherein said dye compound is 2-(5-benzamido-3-benzoyl-2-hydroxyphenyl) benzoxazole, 2-(5-(p-fluorobenzamido)-3-(p-fluorobenzoyl)-2-hydroxyphenyl) benzoxazole, 2-(5-benzamido-2-hydroxyphenyl) benzoxazole or mixtures thereof.

21. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 1, wherein said dispersion or solution is non-aqueous and wherein the dye compound has sulfone groups which are protonated.

9. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles comprising an aqueous dispersion or solution of a sulfonated luminescent dye compound having an adjusted pH below 4.0.

10. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 9, wherein said adjusted pH is below 2.0.

11. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 10, wherein said luminescent dye is 2-(5-benzamido-3-benzoyl-2-hydroxyphenyl) benzoxazole.

12. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 11, wherein said dye is dissolved in a water solvent.

13. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 12 further comprising a surface active agent.

14. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 13, wherein said pH is adjusted with hydrochloric acid.

15. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 10, wherein said luminescent dye is 2-(5-(p-fluorobenzamido)-3-(p-fluorobenzoyl)-2-hydroxyphenyl)benzoxazole.

16. A guidepath composition which forms a permanent bond between a carpet and said composition and emits radiation for detection by automated guidance vehicles in accordance with claim 15 wherein said dye is dissolved in a methanol water solvent mixture.

17. A method of producing a guidepath composition which forms a permanent bond between a carpet and said composition, for application to a carpet, as claimed in claim 14, comprising the steps of:

a) sulfonating said dye material;

b) dissolving said sulfonated dye material in a distilled water solvent to form a solution;

c) adding a surface active agent to said solution; and

d) adjusting said pH of said solution to a pH below 4.0 by addition of an acid.

18. A method of producing a guidepath composition which forms a permanent bond between a carpet and said composition, for application to a carpet, in accordance with claim 17, wherein said pH is adjusted to below 2.0.

19. A method of producing a guidepath composition which forms a permanent bond between a carpet and said composition, for application to a carpet, as claimed in claim 16, comprising the steps of:

a) sulfonating said dye material;

b) partially dissolving said dye material in a distilled water solvent to form a dye solution;

c) adjusting the pH of the dye solution to a pH below 4.0 by addition of an acid; and

d) fully dissolving said dye solution by addition of a methanol solvent.

20. A method of producing a guidepath composition which forms a permanent bond between a carpet and said composition, for application to a carpet, in accordance with claim 19, wherein said pH is adjusted to below 2.0.