Patent ID: 7399643
Filing Date: 2008-07-15
Classification: B01J,B01L,G03H,Y10T

Abstract:
1. A method for aligning microbeads to be read by a code reading or other detection device, comprising: providing microbeads to a positioning device, each microbead having an elongated body with a holographic code disposed thereon or therein, the code being oriented to extend along a longitudinal axis of the corresponding microbead and being defined at least in part by variation of a refractive index of the microbead, the refractive index varying in an axial direction along the longitudinal axis of the microbead; and aligning the microbeads with the positioning device so the codes, the variation in the refractive index of the codes, and the longitudinal axis of the microbeads are in a common fixed orientation relative to the code reading or other detection device.