Patents by Inventor by Julia F. Lawrence executrix

by Julia F. Lawrence executrix 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).

  • Hydrogen detector
    Patent number: 4477778
    Abstract: A hydrogen detector having a hydrogen-permeable membrane between the atmosphere and the inside of a vacuum tube is heated by an adjacent filament located within the tube.
    Type: Grant
    Filed: March 15, 1982
    Date of Patent: October 16, 1984
    Assignees: Lawrence Electronics Co., Julia F. Lawrence
    Inventors: Samuel C. Lawrence, Jr. deceased, by Julia F. Lawrence executrix, Gary M. Lawrenson