Daniel Gruhl

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Cambridge, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for data hiding in printed images
- Patent number 6,411,392
- Issue date Jun 25, 2002
- Massachusetts Institute of Technology
- Walter Bender
- B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER
Information Patent Grant
Method and apparatus for multi-bit zoned data hiding in printed images
- Patent number 6,212,285
- Issue date Apr 3, 2001
- Massachusetts Institute of Technology
- Walter Bender
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for logo hiding in images
- Patent number 6,201,879
- Issue date Mar 13, 2001
- Massachusetts Institute of Technology
- Walter Bender
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for echo data hiding in audio signals
- Patent number 5,893,067
- Issue date Apr 6, 1999
- Massachusetts Institute of Technology
- Walter Bender
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Method and apparatus for data hiding in images
- Patent number 5,870,499
- Issue date Feb 9, 1999
- Massachusetts Institute of Technology
- Walter Bender
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for data hiding in images
- Patent number 5,689,587
- Issue date Nov 18, 1997
- Massachusetts Institute of Technology
- Walter Bender
- G06 - COMPUTING CALCULATING COUNTING