Patents by Inventor Pierre Boissier

Pierre Boissier 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).

  • Manhole assembly with removable cover, especially for a carriageway
    Patent number: 4015373
    Abstract: A flat outer frame is provided with an edge-section for receiving a single-piece manhole cover which has three projections located at the apices of a triangle and adapted to rest on the edge-section so as to form a horizontal bearing triangle. Means are provided for locking the cover within the frame so as to prevent tilting of the cover about any one side of the bearing triangle under the action of a downwardly directed force applied to the cover externally of the triangle.
    Type: Grant
    Filed: February 6, 1976
    Date of Patent: April 5, 1977
    Assignee: Usines et Acieries de Sambre et Meuse
    Inventor: Pierre Boissier