Patents by Inventor Donald Carl Nelson

Donald Carl Nelson 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).

  • Collapsible playhouse made of two equal parts
    Patent number: 3977119
    Abstract: A simple collapsible playhouse of substantial dimensions made of rigid material which can be easily folded for storage or easily opened for use by anyone including small children. The playhouse can be made of two equal parts which when properly taped or hinged together form a complete playhouse.
    Type: Grant
    Filed: June 26, 1975
    Date of Patent: August 31, 1976
    Inventor: Donald Carl Nelson