Methods and arrangements for sorting items, useful in recycling

US11878327B2 · kind B2 · utility

Assignee

• Digimarc Corporation · US

Inventors

• Ravi K. Sharma · Portland, US
• Tomas Filler · Beaverton, US
• Vojtech Holub · Portland, US
• Osama M. Alattar · Tigard, US
• Hugh L. Brunk · Portland, US
• John D. Lord · Austin, US
• Geoffrey B. Rhoads · West Linn, US
• William Y. Conwell · Portland, US
• Ajith M. Kamath · Beaverton, US

Key dates

• Filing date: Sep 9, 2021
• Grant date: Jan 23, 2024
• Expiry date: Oct 12, 2041

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B07C2501/0045
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A plastic item, such as a beverage bottle, can convey two distinct digital watermarks, encoded using two distinct signaling protocols. A first, printed label watermark conveys a retailing payload, including a Global Trade Item Number (GTIN) used by a point-of-sale scanner in a retail store to identify and price the item when presented for checkout. A second, plastic texture watermark may convey a recycling payload, including data identifying the composition of the plastic. The use of two different signaling protocols assures that a point-of-sale scanner will not spend its limited time and computational resources working to decode the recycling watermark, which may lack data needed for retail checkout. In some embodiments, a recycling apparatus makes advantageous use of both types of watermarks to identify the plastic composition of the item (e.g., relating GTIN to plastic type using an associated database), thereby increasing the fraction of items that are correctly identified for sorting and recycling. In other embodiments the plastic item (or a label thereon) bears only a single watermark. A great number of other features and arrangements are also detailed.