Patents by Inventor Fritz Tscharf

Fritz Tscharf 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).

  • Plant package and method of preparing the same
    Patent number: 4006561
    Abstract: Living plants, such as young, evergreen or deciduous trees or bushes, can be stored without loss of viability for several months, and cut flowers can be stored for about a week without apparent loss or freshness when enclosed in a plastic sheet or film envelope which is waterproof, excludes at least 30% of incident visible light and substantially all incident infrared radiation, and is permeable to the gaseous constituents of air, but not more permeable to gaseous oxygen, carbon dioxide, and water vapor than low-density polyethylene film having a thickness of 20 micron.
    Type: Grant
    Filed: September 7, 1972
    Date of Patent: February 8, 1977
    Assignee: Pflanz-Frisch Transportsack GmbH
    Inventors: Gustav Thoma, Fritz Tscharf, Helmut Astinet