Patents by Inventor John Gradwell

John Gradwell 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).

  • Patent number: 4144672
    Abstract: Open-topped container for cultivating one or more plants individually contained in a corresponding number of cavities of said container, containing a natural or artificial cultivating medium for said plant(s), e.g. soil, and being adapted for easy transplantation of such plants by said base comprising a peripheral line of weakness adapted for an application of pressure against the base cause the base to break loose from the remainder of the container. The line of weakness having an average breaking strength of between 10 and 40% of the average breaking strength of the base is preferably formed wholly or in part by elongate drainage holes passing through the base and so dimensioned that cultivating medium is retained. For transplantation the base is pushed upwards with the cultivating medium and plant.
    Type: Grant
    Filed: February 9, 1977
    Date of Patent: March 20, 1979
    Assignee: Jack Lazarus
    Inventors: John Gradwell, William Daly