Patents by Inventor Craig M. Steffen

Craig M. Steffen 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).

  • Publication number: 20230002981
    Abstract: A paving machine includes a plurality of sensor(s) for generating sensor data associated with a paving operation. Criteria associated with paving mat defects are compared against the sensor data to determine whether the criteria is satisfied and whether paving mat defects are predicted. For example, criteria may include whether a hopper of the paving machine is activated, whether a screed assembly of the paving machine is floating, a speed of the paving machine, and whether heat is applied to the screed assembly. In instances where defects are predicted, notifications of such may be provided, or displayed, on a control interface of the paving machine.
    Type: Application
    Filed: July 2, 2021
    Publication date: January 5, 2023
    Applicant: Caterpillar Paving Products Inc.
    Inventors: Craig M. Steffen, Toby A. Frelich, John L. Marsolek
  • Patent number: 8973688
    Abstract: A suspension system for cold planer with four tracks is disclosed. The suspension system includes a hydraulic cylinder for each track, an additional bypass valve for each hydraulic cylinder and an additional bypass valve that bypasses the operation of the front control valves that control the elevation of the front tracks during a cutting operation. During transport or roading of the cold planer, the bypass valves are energized by a controller and the energized bypass valves provide communication between the head ends of the left side cylinders and the head ends of the right side cylinders. During roading, the energized bypass valves also provide communication between the rod ends of the front cylinders and between the rod ends of the rear cylinders.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: March 10, 2015
    Assignee: Caterpillar Paving Products Inc.
    Inventor: Craig M. Steffen
  • Publication number: 20130153310
    Abstract: A suspension system for cold planer with four tracks is disclosed. The suspension system includes a hydraulic cylinder for each track, an additional bypass valve for each hydraulic cylinder and an additional bypass valve that bypasses the operation of the front control valves that control the elevation of the front tracks during a cutting operation. During transport or roading of the cold planer, the bypass valves are energized by a controller and the energized bypass valves provide communication between the head ends of the left side cylinders and the head ends of the right side cylinders. During roading, the energized bypass valves also provide communication between the rod ends of the front cylinders and between the rod ends of the rear cylinders.
    Type: Application
    Filed: December 20, 2011
    Publication date: June 20, 2013
    Applicant: CATERPILLAR PAVING PRODUCTS INC.
    Inventor: Craig M. Steffen
  • Publication number: 20130079999
    Abstract: Cold planers work in a variety of conditions where different rotor speeds can be beneficial. The rotor is connected directly to the engine via a clutch so the speed cannot be changed independent of the engine speed. The control system disclosed herein enables the operator to quickly select from a plurality of different engine/rotor speeds. The engine/rotor speeds correspond to different machine applications. Each speed corresponds to a point on the torque map for the particular cold planer that will offer acceptable machine performance for the particular application. If the operator inputs one of the plurality of different commands, a timer is activated and movement of the cold planer must take place within a predetermined time period or the engine speed is reduced to the elevated idle speed where the clutch is able to engage the rotor.
    Type: Application
    Filed: September 28, 2011
    Publication date: March 28, 2013
    Applicant: CATERPILLAR PAVING PRODUCTS INC.
    Inventors: Daniel H. Killion, Andrew J. Krolnik, Craig M. Steffen