Human and scanner readable radiation exposure indicator with reactive barcode

• US 7,798,414 B2
• Filed: 07/23/2007
• Issued: 09/21/2010
• Est. Priority Date: 07/21/2006
• Status: Active Grant

• Current Assignee: Isp Investments LLC (Ashland Global Holdings, Inc.)
• Original Assignee: ISP Investments, Inc. (Ashland Global Holdings, Inc.)
• Inventors: Lewis, David F.
• Primary Examiner(s): Le; Thien Minh
• Assistant Examiner(s): Vo; Tuyen K
• Application Number:
  US11/781,500
• Publication Number:
  US 20080029606A1
• Time in Patent Office: 1,156 Days
• Field of Search: 235/468, 235/491, 235/494, 235/462.01, 235/462.04
• US Class Current: 235/491
• CPC Class Codes: G06K 19/06028 using bar codes
• CPC Class Codes: G06K 19/06046 Constructional details

Abstract

The present invention is a reactive bar-code element which is unreadable prior to irradiation and readable after irradiation.

Claims

1. A reactive barcode element comprising a radiation sensitive film coating on a reflective film base and a knock-out barcode printed in white on a transparent adhesive film on said film coating wherein said barcode element is unreadable prior to irradiation and readable after irradiation, wherein said irradiation comprises high energy radiation;

wherein said reactive barcode element which undergoes a substantial change in opacity after irradiation whose change is observable in the transparent knock-out portion of the over-laminate by the strong contrast between the barcode characters and the background which is readily readable by humans or with a barcode scanner.

2. An element according to claim 1 wherein said knock-out barcode has characters which are transparent.

3. An element according to claim 1 wherein said knock-out barcode is printed onto a transparent adhesive coated label stock.

4. An element according to claim 3 wherein said knock-out barcode is laminated to said radiation sensitive coating.

5. A reactive barcode element comprising a radiation sensitive film coating on a reflective film base and a knock-out barcode printed in white on a transparent adhesive film on said film coding wherein the reactive barcode element is unreadable prior to irradiation and readable after irradiation with high energy radiation and said barcode element comprises at least one bar primed with a color similar to that of the radiation sensitive film after exposure to radiation;

wherein said reactive barcode element which undergoes a substantial change in opacity after irradiation whose change is observable in the transparent knock-out portion of the over-laminate by the strong contrast between the barcode characters and the background which is readily readable by humans or with a barcode scanner.