×

Rotationally symmetric tags

  • US 7,108,192 B2
  • Filed: 12/04/2002
  • Issued: 09/19/2006
  • Est. Priority Date: 09/17/1999
  • Status: Expired due to Fees
First Claim
Patent Images

1. Machine-readable coded data disposed on or in a substrate in accordance with a layout, the layout having at least order n rotational symmetry, where n is at least two, the layout including n identical sub-layouts rotated 1/n revolutions apart about a center of rotational symmetry of the layout, the coded data disposed in accordance with each sub-layout including rotation-indicating data that distinguishes the rotation of that sub-layout from the rotation of at least one other sub-layout within the layout.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×