US Patent No: 5,449,896

Number of patents in Portfolio can not be more than 2000

Random access techniques for use with self-clocking glyph codes

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Abstract

An optically readable record for storing encoded information comprises (1) a recording medium, (2) a self-clocking data code for encoding the information, with this data code being composed of glyphs that are written in a two dimensional code field on the recording medium on centers that are spatially distributed in nominal accordance with a predetermined spatial formatting rule, where the glyphs are defined by respective symbols that are selected from a finite set of optically discriminable symbols to encode the information, and (3) at least one additional glyph pattern that is written on said recording medium in nominal accordance with the spatial formatting rule, the additional code pattern providing physical addressing information for random access from any given location within the glyph pattern to any other given location within the same glyph pattern or another glyph pattern on the same or a differnt recording medium.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
XEROX CORPORATIONSTAMFORD, CT17085

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Flores, L Noah Woodside, CA 15 700
Hecht, David L Palo Alto, CA 60 2696
Petrie, Glen W Los Gatos, CA 29 1130
Webster, Thomas M Cleves, OH 8 149

Cited Art

Patent Info (Count) # Cites Year
 
XEROX CORPORATION (4)
5,091,966 Adaptive scaling for decoding spatially periodic self-clocking glyph shape codes 263 1990
5,128,525 Convolution filtering for decoding self-clocking glyph shape codes 238 1990
5,221,833 Methods and means for reducing bit error rates in reading self-clocking glyph codes 160 1991
5,245,165 Self-clocking glyph code for encoding dual bit digital values robustly 211 1991

Patent Citation Ranking

Forward Cites

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