Inventor

HARTWELL WALTER T

US7 patents

⚠️ This page may combine multiple inventors who share the name “HARTWELL WALTER T”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

AMERICAN TELEPHONE & TELEGRAPH

4 patents

US4719923AJan 19, 1988

Non-invasive blood flow measurements utilizing autoregressive analysis with averaged reflection coefficients

AMERICAN TELEPHONE & TELEGRAPH55 citations94

US4797926AJan 10, 1989

AT & T BELL LAB

1 patent

US4914692AApr 3, 1990

Automatic speech recognition using echo cancellation

AT & T BELL LAB79 citations95

CORNELL RONALD G

1 patent

US4221933ASep 9, 1980

Data storage and retrieval structure for a message storage system

CORNELL RONALD G51 citations85

BELL TELEPHONE LABOR INC

1 patent

US4164041AAug 7, 1979

Memory organization to distribute power dissipation and to allow single circuit pack memory growth

BELL TELEPHONE LABOR INC2 citations56

HARTWELL WALTER T

AMERICAN TELEPHONE & TELEGRAPH

Non-invasive blood flow measurements utilizing autoregressive analysis with averaged reflection coefficients

Digital speech vocoder

Digital speech sinusoidal vocoder with transmission of only subset of harmonics

Digital speech coder with different excitation types

AT & T BELL LAB

Automatic speech recognition using echo cancellation

CORNELL RONALD G

Data storage and retrieval structure for a message storage system

BELL TELEPHONE LABOR INC

Memory organization to distribute power dissipation and to allow single circuit pack memory growth