Location History:
- Westford, MA (US) (1977 - 1982)
- North Chelmsford, MA (US) (1986 - 1987)
Company Filing History:
4 out of 5 
3 out of 6 
2 out of 10 Years Active: 1977-1987
Title: The Innovative Contributions of Richard E. DeFreitas
Introduction
Richard E. DeFreitas is an accomplished inventor based in Westford, MA, with a remarkable portfolio of ten patents. His work is pivotal in the fields of clock signal generation and digital encoding circuitry, showcasing his innovative approach to solving complex technological challenges.
Latest Patents
Among his latest inventions, DeFreitas has developed a patent for generating narrowly-separated variable-frequency clock signals. This technology focuses on creating clock signals with slightly different frequencies while preventing them from locking up in synchrony. The methodology involves a voltage-to-frequency converter, driven by an integrator, and a signal that represents the sum of a frequency-difference command along with the difference between two clocks.
Another significant invention from DeFreitas is his digital encoding circuitry. This delta encoding circuitry operates by determining a digitally-encoded signal based on the difference between the current value of an input signal and a reconstructed signal from its past value. The system's design allows for the high or low states in the digitally-encoded signal to correspond to incremental changes in the input signal, modulated by a reference signal that adjusts based on the detection of consecutive digital states.
Career Highlights
Richard E. DeFreitas has made substantial contributions while working for notable companies such as Deltalab Research, Inc. and Analog and Digital Systems, Inc. His career reflects a strong commitment to innovation and the advancement of electronic technologies.
Collaborations
Throughout his professional journey, DeFreitas has collaborated with esteemed colleagues, including Samuel Wilensky and John J. Blake. These partnerships not only enhance the creative process but also contribute to the successful development of groundbreaking technologies.
Conclusion
Richard E. DeFreitas's inventive spirit and dedication to technological advancement have left a significant mark in the fields of clock signal generation and digital encoding. His patented innovations continue to influence electronic systems, reflecting the essence of innovative engineering and collaboration in the modern technological landscape.