Patents by Inventor Donald Betzold

Donald Betzold 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).

  • Method of repairing a manhole chimney using a stretchable sleeve
    Publication number: 20070113519
    Abstract: A method of repairing and renewing a manhole chimney utilizes a circumferentially stretchable liner sleeve which is inserted into the manhole and pressed by an inflatable bladder into engagement with the walls of the manhole chimney. The sleeve is coated with an uncured resin, which is allowed to cure as the sleeve is pressed against the chimney walls, thereby attaching the sleeve to the walls of the manhole chimney. The stretchable sleeve eliminates air spaces between the sleeve and the chimney walls, and precludes formation of undesirable folds in the sleeve. The sleeve stretches circumferentially up to 150% of its unstretched diameter, while having a substantially unstretchable length.
    Type: Application
    Filed: November 23, 2005
    Publication date: May 24, 2007
    Applicant: LMK ENTERPRISES, INC.
    Inventors: Larry Kiest, Jason Bartlett, Thomas O'Sullivan, Raymond Greek, Timothy Back, Donald Betzold