Patents by Inventor Martha Carmack

Martha Carmack 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: 4158424
    Abstract: The lid is made up of generally rectangular bottom and top walls having their edges sealingly connected to define a hollow interior. A bottom projecting portion is formed of smaller rectangular dimensions to fit within the upper side walls of a rubbish bin in sealing relationship. The top wall of the lid is provided with ribs having parallel central portions and thence diverging towards the corners so that utilizing the lid as a water, grass or snow sled by turning the same upside down, is inhibited. Fire retardant crystals may be incorporated in the hollow interior of the lid to aid in smothering any fire which might occur in a bin covered by the lid. Furthermore, portions of the lid are accordion pleated to permit bending about a transverse axis thereby providing a built in soft hinge preventing shattering of the lid during dumping operations.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: June 19, 1979
    Inventor: Martha Carmack