DD

Donald L. Duttweiler

AT AT&T: 20 patents #813 of 18,772Top 5%
BL Bell Telephone Laboratories: 2 patents #297 of 1,445Top 25%
AT American Telephone And Telegraph: 1 patents #132 of 699Top 20%
Overall (All Time): #186,617 of 4,157,543Top 5%
23
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
6813352 Quadrature filter augmentation of echo canceler basis functions 2004-11-02
6628780 Echo cancellation in the network for data applications David G. Shaw 2003-09-30
6604119 High order SINC filter 2003-08-05
6356593 Data optimized codec Nuri Ruhi Dagedeviren, Lynn Emery Ditty, Gerard Pepenella, Dewayne A. Spires 2002-03-12
5951626 Adaptive filter 1999-09-14
5818514 Video conferencing system and method for providing enhanced interactive communication Barin Geoffry Haskell 1998-10-06
5752229 Intelligent near-end speech detection Toshiro Kawahara, Cheng Kim, Toshio Miki 1998-05-12
5668865 Echo canceler E-side speech detector Cheng Kim, Ying Get Tao 1997-09-16
5631899 Acoustic echo canceler 1997-05-20
5566167 Subband echo canceler 1996-10-15
5031053 Efficient encoding/decoding in the decomposition and recomposition of a high resolution image utilizing pixel clusters Christodoulos Chamzas 1991-07-09
5025258 Adaptive probability estimator for entropy encoding/decoding 1991-06-18
5023611 Entropy encoder/decoder including a context extractor Christodoulos Chamzas 1991-06-11
4979049 Efficient encoding/decoding in the decomposition and recomposition of a high resolution image utilizing its low resolution replica Christodoulos Chamzas 1990-12-18
4973961 Method and apparatus for carry-over control in arithmetic entropy coding Christosdoulos Chamzas 1990-11-27
4870497 Progressive transmission of high resolution two-tone facsimile images Christodoulos Chamzas 1989-09-26
4731834 Adaptive filter including signal path compensation John Hartung 1988-03-15
4591669 Adaptive filter update gain normalization John Hartung 1986-05-27
4562312 Subsampling delay estimator for an echo canceler 1985-12-31
4491701 Adaptive filter including a far end energy discriminator Timothy J. Zebo 1985-01-01
4468641 Adaptive filter update normalization Charles W. K. Gritton, Ying Get Tao 1984-08-28
4243959 Adaptive filter with tap coefficient leakage 1981-01-06
4189715 .mu.-Law to floating point converter 1980-02-19