Patents by Inventor Donald L. Betzold

Donald L. 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: 20140202570
    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: March 20, 2014
    Publication date: July 24, 2014
    Inventors: Larry W. Kiest, JR., Jason Bartlett, Thomas M. O'Sullivan, III, Raymond L. Greek, Timothy L. Back, Donald L. Betzold
  • Method of repairing a manhole chimney using a stretchable sleeve
    Patent number: 8721216
    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: Grant
    Filed: October 1, 2009
    Date of Patent: May 13, 2014
    Assignees: LMK Enterprises, Inc., O'Sullivan Trenchless Installation Services
    Inventors: Larry W. Kiest, Jr., Jason Bartlett, Thomas M. O'Sullivan, III, Raymond L. Greek, Timothy L. Back, Donald L. Betzold
  • Method of repairing a manhole chimney using a stretchable sleeve
    Patent number: 7670086
    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: Grant
    Filed: November 23, 2005
    Date of Patent: March 2, 2010
    Assignees: LMK Enterprises, Inc., O'Sullivan Trenchless Installation Services
    Inventors: Larry W. Kiest, Jr., Jason Bartlett, Thomas M. O'Sullivan, III, Raymond L. Greek, Timothy L. Back, Donald L. Betzold
  • METHOD OF REPAIRING A MANHOLE CHIMNEY USING A STRETCHABLE SLEEVE
    Publication number: 20100018631
    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: October 1, 2009
    Publication date: January 28, 2010
    Applicants: LMK ENTERPRISES, INC., O'SULLIVAN TRENCHLESS INSTALLATION SERVICES
    Inventors: LARRY W. KIEST, JR., JASON BARTLETT, THOMAS M. O'SULLIVAN, III, RAYMOND L. GREEK, TIMOTHY L. BACK, DONALD L. BETZOLD