Patents by Inventor Campbell E. Waller

Campbell E. Waller 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).

  • Chip catching washers
    Patent number: 4312616
    Abstract: According to the present invention, a washer is provided for a self drilling screw or like fastening device through which the fastening device passes, said washer defining a cavity capable of capturing the retaining drill chips as they are formed. The washer may include means for positively locating the washer on and over the drill point of the fastening device. The cavity can be formed by a skirt region adapted to surround the fastening device and in one aspect the cavity may include a mastic or like substance capable of securely holding drill chips.
    Type: Grant
    Filed: August 16, 1979
    Date of Patent: January 26, 1982
    Assignee: McPherson's Limited
    Inventors: Campbell E. Waller, Keith E. Watts