Patents by Inventor Ludovic F. Hanff

Ludovic F. Hanff 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).

  • Automatic watering device
    Patent number: 4015616
    Abstract: This invention relates to a device for providing water to a lawn in accordance with the amount of moisture in the soil. As the soil dries, moisture sensitive switches react to the drying process until, at a preselected degree of dryness, the moisture sensitive switches close an electrical circuit to actuate a water pump and thereby provide water to the lawn.
    Type: Grant
    Filed: August 25, 1975
    Date of Patent: April 5, 1977
    Inventor: Ludovic F. Hanff