Porous or mesh

Patents Grantslast 30 patents

  • Information Patent Grant

    Internally finned tube

    • Patent number 4,163,474
    • Issue date Aug 7, 1979
    • E. I. Du Pont de Nemours and Company
    • Robert D. MacDonald
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...

Patents Applicationslast 30 patents