Patents by Inventor Craig Culbertson

Craig Culbertson 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).

  • Adjustable tamper-resistant locking mechanism for manhole cover
    Patent number: 12297673
    Abstract: This disclosure includes a manhole cover locking device, system, and kit, each configured for locking a manhole cover in a closed position overtop an access opening of a container, the access opening being arranged at one end of a collar extending outwardly from the container, each comprising: a body; a mechanism for connecting the body to a pre-existing portion of the manhole collar or the container; and, a mechanism for securing the body to the manhole cover to prevent the opening of the manhole cover using a pre-existing portion of the manhole cover. Each mechanism may be tamper resistant. The disclosure also includes methods of installing and using the device, system, and kit.
    Type: Grant
    Filed: May 15, 2023
    Date of Patent: May 13, 2025
    Assignee: Betts Industries, Inc.
    Inventors: David Adams, Michael Gustafson, Craig Culbertson
  • ADJUSTABLE TAMPER-RESISTANT LOCKING MECHANISM FOR MANHOLE COVER
    Publication number: 20230366245
    Abstract: This disclosure includes a manhole cover locking device, system, and kit, each configured for locking a manhole cover in a closed position overtop an access opening of a container, the access opening being arranged at one end of a collar extending outwardly from the container, each comprising: a body; a mechanism for connecting the body to a pre-existing portion of the manhole collar or the container; and, a mechanism for securing the body to the manhole cover to prevent the opening of the manhole cover using a pre-existing portion of the manhole cover. Each mechanism may be tamper resistant. The disclosure also includes methods of installing and using the device, system, and kit.
    Type: Application
    Filed: May 15, 2023
    Publication date: November 16, 2023
    Applicant: Betts Industries, Inc.
    Inventors: David Adams, Michael Gustafson, Craig Culbertson