Patents by Inventor Juha POLONEN

Juha POLONEN 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).

  • Valve cylinder, impact device and method
    Patent number: 12404725
    Abstract: A hydraulic system, rock drilling rig, and method for limiting output performance of a hydraulic drilling actuator temporarily under execution of a safety function feature of a hydraulic system is provided. The output performance is limited by limiting produced hydraulic fluid flow in a hydraulic circuit of the hydraulic drilling actuator, whereby a restricted magnitude of the fluid flow is produced at a hydraulic pump. This way a restricted operation mode is enabled and is controlled by a control unit.
    Type: Grant
    Filed: December 2, 2022
    Date of Patent: September 2, 2025
    Assignee: Sandvik Mining and Construction Oy
    Inventors: Juha Polonen, Jarkko Niemi, Timo Kela
  • VALVE CYLINDER, IMPACT DEVICE AND METHOD
    Publication number: 20250027368
    Abstract: A hydraulic system, rock drilling rig, and method for limiting output performance of a hydraulic drilling actuator temporarily under execution of a safety function feature of a hydraulic system is provided. The output performance is limited by limiting produced hydraulic fluid flow in a hydraulic circuit of the hydraulic drilling actuator, whereby a restricted magnitude of the fluid flow is produced at a hydraulic pump. This way a restricted operation mode is enabled and is controlled by a control unit.
    Type: Application
    Filed: December 2, 2022
    Publication date: January 23, 2025
    Inventors: Juha POLONEN, Jarkko NIEMI, Timo KELA