(12) United States Patent ao) Patent No.: us 6,427,922 Bi
Marchand (45) Date of Patent: Aug. 6,2002
(54) PRINTABLE MICROWAVE IMAGES FOR DATA ENCODING
(75) Inventor: J. F. Philippe Marchand, Rochester, NY (US)
(73) Assignee: Xerox Corporation, Stamford, CT (US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/725,999
(22) Filed: Nov. 29, 2000
(51) Int. C I. G06K 7/10
(52) U.S. CI 235/494; 235/462.46
(58) Field of Search 235/494, 462.46
(56) References Cited
U.S. PATENT DOCUMENTS
4,008,477 A 2/1977 Babij et al.
5,581,257 A 12/1996 Greene et al.
A printable microwave image for data encoding is provided. The microwave image comprises a two-dimensional pattern of a plurality of pixels on a surface, wherein each pixel exists in one of two states with respect to radiation in a microwave frequency range. An opaque state prevents transmission of microwave radiation, and a transparent state permits transmission of microwave radiation. The applicable microwave frequency range is from a low frequency of 1 gigahertz to a high frequency of 200 gigahertz. The opaque pixels can be comprised of reflective printer ink that reflects the microwave radiation, absorbent printer ink that absorbs the microwave radiation, reflective laser printer toner that reflects the microwave radiation, absorbent laser printer toner that absorbs the microwave radiation, or a metal foil.
19 Claims, 8 Drawing Sheets
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