Patents by Inventor Clifford D. Duffy

Clifford D. Duffy 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).

  • Insulation supporting means for metal buildings
    Patent number: 5085023
    Abstract: A plurality of support strips are suspended from metal building purlins by a hook tab. This hook tab forms a part of a first one of the strip sections and is held down in locking engagement on the purlin by the telescoping engagement of another section onto the first section. Spacer strips may be employed longitudinally of the building for selectively spacing the support strips.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: February 4, 1992
    Inventor: Clifford D. Duffy