Patents by Inventor Malcolm D. Johnstone

Malcolm D. Johnstone 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).

  • LED flasher for battery cell-powered lamp
    Patent number: 4228484
    Abstract: An LED flasher circuit is attached to a battery-cell-powered lamp and connected to the battery power source to provide a finding aid for the battery lamp in the dark.
    Type: Grant
    Filed: December 4, 1978
    Date of Patent: October 14, 1980
    Inventor: Malcolm D. Johnstone