Patents by Inventor Donald P. Crosby

Donald P. Crosby 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 and apparatus for automatically testing a railroad interlocking
    Patent number: 7711511
    Abstract: A railroad signal system interlocking is automatically tested. A control point interface corresponding to a predetermined function of the interlocking has an isolated section and a control section. The isolated section is connected with the interlocking and has a normal, inactivated state during operation of the interlocking, and an activated state for testing the interlocking by detecting an electrical characteristic representing the status of the predetermined function executed by the interlocking. The control section drives the isolated section to its activated state and receiving an output from the isolated section in response to the detected electrical characteristic, and delivers a status report.
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: May 4, 2010
    Assignee: Ultra-Tech Enterprises, Inc.
    Inventors: Joseph C. Winkler, Paul J. Galburt, Donald P. Crosby, David K. Rayna, Christopher V. Traynor, George T. Briechle
  • Method and apparatus for automatically testing a railroad interlocking
    Publication number: 20080288202
    Abstract: A railroad signal system interlocking is automatically tested. A control point interface corresponding to a predetermined function of the interlocking has an isolated section and a control section. The isolated section is connected with the interlocking and has a normal, inactivated state during operation of the interlocking, and an activated state for testing the interlocking by detecting an electrical characteristic representing the status of the predetermined function executed by the interlocking. The control section drives the isolated section to its activated state and receiving an output from the isolated section in response to the detected electrical characteristic, and delivers a status report.
    Type: Application
    Filed: February 29, 2008
    Publication date: November 20, 2008
    Inventors: Joseph C. Winkler, Paul J. Galburt, Donald P. Crosby, David K. Rayna, Christopher V. Traynor, George T. Briechle
  • Method and apparatus for automatically testing a railroad interlocking
    Patent number: 7363187
    Abstract: A railroad signal system interlocking is automatically tested. A control point interface corresponding to a predetermined function of the interlocking has an isolated section and a control section. The isolated section is connected with the interlocking and has a normal, inactivated state during operation of the interlocking, and an activated state for testing the interlocking by detecting an electrical characteristic representing the status of the predetermined function executed by the interlocking. The control section drives the isolated section to its activated state and receiving an output from the isolated section in response to the detected electrical characteristic, and delivers a status report.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: April 22, 2008
    Assignee: Ultra-Tech Enterprises, Inc.
    Inventors: Joseph C. Winkler, Paul J. Galburt, Donald P. Crosby, David K. Rayna, Christopher V. Traynor, George T. Briechle
  • Friction drive unit for riding lawn mowers and the like
    Patent number: 5496226
    Abstract: A variable speed friction drive apparatus for a lawn mower includes a pair of drive cones supported by a frame for rotational movement about a common first axis, and a pair of drums supported by carriages for rotation about axes transverse to the lengths of the carriages. Each carriage is supported on the frame for movement between a neutral position in which the associated drum is disengaged from either of the cones and a plurality of driving positions in which the drum engages either of the cones. A universal joint connects the rear end of each carriage to the frame for universal pivotal movement about the joint, and both ends of each carriage are independently biased toward the neutral position.
    Type: Grant
    Filed: May 17, 1994
    Date of Patent: March 5, 1996
    Assignee: Dixon Industries, Inc.
    Inventors: Clair D. Splittstoesser, Donald P. Crosby, David G. Park, Larry S. Funk
  • Riding lawn mower
    Patent number: D359740
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: June 27, 1995
    Assignee: Dixon Industries, Inc.
    Inventors: Donald P. Crosby, Clair R. Splittstoesser
  • Walk behind mower
    Patent number: D423018
    Type: Grant
    Filed: August 11, 1997
    Date of Patent: April 18, 2000
    Assignee: Dixon Industries, Inc.
    Inventors: Donald P. Crosby, Larry S. Funk, Daniel R. Cook