Patents by Inventor Patrick L. Macrorie

Patrick L. Macrorie 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).

  • Ladder safety lamp
    Patent number: 4311208
    Abstract: A warning light assembly for use on ladders having a plurality of rungs to indicate the presence of someone on the ladder. The warning light assembly has a switch activated by a person's foot placed on one of the lower rungs of the ladder. When first activated, the switch turns on a flashing light positioned about eye level. As the person disembarks from the ladder, his foot on the lower rung again activates the switch turning off the flashing light.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: January 19, 1982
    Inventors: Patrick L. Macrorie, Ronald C. Rohrenbacher, Stephen B. Austin