Patents by Inventor Gunnar V. R. Romell

Gunnar V. R. Romell 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 rock bolting and tube-formed expansion bolt
    Patent number: 4634317
    Abstract: A tube-formed rockbolt is partly circular in its cross-section and opposite its circular portion (12) it has a deep depression (16-18). Its ends are sealed and its outer end has a hole (44, 45) or a fitting (24) through which the bolt can be supplied with high pressure water that expands the tube to anchor it in the borehole.
    Type: Grant
    Filed: January 23, 1984
    Date of Patent: January 6, 1987
    Assignee: Atlas Copco Aktiebolag
    Inventors: Bo T. Skogberg, Gunnar V. R. Romell
  • Method of rock bolting and tube-formed expansion bolt
    Patent number: 4509889
    Abstract: A tube-formed rockbolt is partly circular in its cross-section and opposite its circular portion (12) it has a deep depression (16-18). Its ends are sealed and its outer end has a hole (44, 45) or a fitting (24) through which the bolt can be supplied with high pressure water that expands the tube to anchor it in the borehole.
    Type: Grant
    Filed: January 23, 1984
    Date of Patent: April 9, 1985
    Assignee: Atlas Copco Aktiebolag
    Inventors: Bo T. Skogberg, Gunnar V. R. Romell
  • Method of rock bolting and tube-formed expansion bolt
    Patent number: 4459067
    Abstract: A tube-formed rockbolt is partly circular in its cross-section and opposite its circular portion (12) it has a deep depression (16-18). Its ends are sealed and its outer end has a hole (44, 45) or a fitting (24) through which the bolt can be supplied with high pressure water that expands the tube to anchor it in the borehole.
    Type: Grant
    Filed: March 6, 1980
    Date of Patent: July 10, 1984
    Assignee: Atlas Copco Aktiebolag
    Inventors: Bo T. Skogberg, Gunnar V. R. Romell
  • Device for damping the recoil of a work tool connected to a percussion tool
    Patent number: 4073350
    Abstract: A recoil damping device for a percussion tool in which the recoils are damped by means of a pressurized hydraulic fluid entrapped in the machine housing.
    Type: Grant
    Filed: March 8, 1976
    Date of Patent: February 14, 1978
    Assignee: Atlas Copco Aktiebolag
    Inventors: Ake T. Eklof, Per T. A. Fengsborn, Gunnar V. R. Romell