David B Francis

Title: David B. Francis: Innovator in Magnetic Tape Technology and ECG Plotting

Introduction

David B. Francis is a notable inventor based in Mount Kisco, NY (US). He has made significant contributions to the fields of magnetic tape technology and medical instrumentation. With a total of 4 patents to his name, Francis has demonstrated a commitment to innovation and problem-solving in his work.

Latest Patents

One of his latest patents is a magnetic tape recording and playback system. This system features a tape cassette and battery pack joined by a frangible connection in an integral assembly. For recording, the assembly provides battery power to the recorder, while the recorder sends recording signals to the cassette. During playback, the battery is detached from the cassette and discarded, allowing the cassette to be inserted into a playback unit that only accepts the cassette without the battery. This design prevents the reuse of the cassette in the recorder and ensures a fresh battery is used for each recording session.

Another significant patent is a system for plotting a miniature ECG. This method involves printing an analog waveform, such as an ECG, by first converting the waveform into a time sequence of digitally expressed values. Predetermined groups of digital data are formed, and maximum and minimum amplitude values are determined and stored in a line buffer memory. A recording medium advances past a linear array of discrete recording elements, and the stored values are read out in parallel to actuate the elements. The waveform is recorded as a series of appropriately placed short parallel longitudinal lines, creating a transverse waveform display on the recording medium.

Career Highlights

David B. Francis is associated with the International Business Machines Corporation (IBM), where he has contributed to various innovative projects. His work has had a lasting impact on the technology and medical fields, showcasing his ability to merge engineering with practical applications.

Collaborations

Throughout his career, Francis has collaborated with notable coworkers, including Huntington W. Curtis and Frederick A. Dodge. These collaborations have further enriched his work and contributed to the development of his patents.

Conclusion

David B. Francis stands out as an inventor whose work in magnetic tape technology and ECG plotting has made significant advancements in their respective fields. His innovative spirit and dedication to improving technology continue to inspire future generations of inventors.