Patents by Inventor Robert H. Hamstra, Jr.

Robert H. Hamstra, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Strong-motion seismological accelerometer system
    Patent number: 6722203
    Abstract: An accelerometer system principally for use in high spatial density urban arrays for near-real-time mapping of strong shaking due to large earthquakes. The present accelerometer system offers research-grade “16-bit resolution” (=90.3 dB dynamic range =20log(215)), and yet it is inexpensive to buy and inexpensive to maintain. A more efficient and accurate calibration and compensation procedure is also disclosed. The improved accelerometer system is ideally suited to any situation requiring large numbers of instruments, low installation costs, high robustness, low maintenance costs, and near-real-time response. The price/performance point achieved by the present invention far exceeds past instrumentation and opens many new markets.
    Type: Grant
    Filed: April 16, 2002
    Date of Patent: April 20, 2004
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: John Richard Evans, Robert H. Hamstra, Jr.