Patents by Inventor Herb Freedman

Herb Freedman 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).

  • Electrical apparatus with reverse audible alarm
    Patent number: 4890215
    Abstract: In a preferred embodiment, a reversible DC power supply having an audible alarm, especially for use with electrochemical metallizing equipment. The audible alarm is electrically connected directly to the controls of the power supply so that when the power supply is placed in its "reverse" mode, the audible alarm will continuously sound, thus alerting the operator that the power supply is in that mode. In other embodiments, reversible electric tools, such as drills, may be provided with an audible alarm to indicate when they are in their reverse states.
    Type: Grant
    Filed: June 30, 1988
    Date of Patent: December 26, 1989
    Assignee: Selectrons Ltd.
    Inventor: Herb Freedman