Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Methods and apparatus for electronically storing and retrieving value information on a portable card

Methods and apparatus for electronically storing and retrieving value information on a portable card

US Patent 6266647 · Granted Jul 24, 2001

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Methods and apparatus for authenticating data as originating from a storage and 2016
Methods and apparatus for authenticating data as originating from a storage and 2014
Methods and apparatus for authenticating data as originating from a storage and 2012
Differential radio frequency identification reader2007
Methods and apparatus for authenticating data as originating from a storage and 2007
Differential radio frequency identification reader2006
Methods and apparatus for mediametric data cryptoprocessing2006
Methods and apparatus for electronically storing and retrieving value informatio2005
Methods and apparatus for securely conducting and authenticating transactions ov2004
Methods and apparatus for increased magnetic coding density by precise placement2004
Methods and apparatus for authenticating data stored in semiconductor memory cel2004
Methods and apparatus for increased magnetic coding density by precise placement2002