Patents Assigned to Northwest Machine Works, Inc.
  • Core drilling latch assembly
    Patent number: 6019181
    Abstract: A core drilling latch assembly for use in terrestrial core drilling operations. The latch assembly incorporates features and elements which affect the flow of drilling fluids past the latch assembly and toward the drill bit, depending upon whether the latch assembly has contacted the landing ring in the drill string and whether the latch assembly has locked in place within the string. Accordingly, the latch assembly signals the drilling crew by pressure fluctuations when the latch assembly is in proper position within the drill string, and whether it is locked in position.
    Type: Grant
    Filed: June 24, 1999
    Date of Patent: February 1, 2000
    Assignee: Northwest Machine Works, Inc.
    Inventors: Frederick J. Soinski, Donald Raymond
  • Core drilling latch assembly
    Patent number: 5992543
    Abstract: A core drilling latch assembly for use in terrestrial core drilling operations. The latch assembly incorporates features and elements which affect the flow of drilling fluids past the latch assembly and toward the drill bit, depending upon whether the latch assembly has contacted the landing ring in the drill string and whether the latch assembly has locked in place within the string. Accordingly, the latch assembly signals the drilling crew by pressure fluctuations when the latch assembly is in proper position within the drill string, and whether it is locked in position.
    Type: Grant
    Filed: August 31, 1998
    Date of Patent: November 30, 1999
    Assignee: Northwest Machine Works, Inc.
    Inventors: Frederick J. Soinski, Donald Raymond
  • Core drilling latch assembly
    Patent number: 5799742
    Abstract: A core drilling latch assembly for use in terrestrial core drilling operations. The latch assembly incorporates features and elements which affect the flow of drilling fluids past the latch assembly and toward the drill bit, depending upon whether the latch assembly has contacted the landing ring in the drill string and whether the latch assembly has locked in place within the string. Accordingly, the latch assembly signals the drilling crew by pressure fluctuations when the latch assembly is in proper position within the drill string, and whether it is locked in position.
    Type: Grant
    Filed: October 22, 1996
    Date of Patent: September 1, 1998
    Assignee: Northwest Machine Works, Inc.
    Inventors: Frederick J. Soinski, Donald Raymond