Invalidity dossier

US 9133837

Added 5/27/2026, 12:00:59 PM

IndustryIndustrial Manufacturing (IM)

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Patent summary

Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.

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US patent 9133837 has the following details:

  • Title: Method of controlling a hydraulic system
  • Assignee: Caterpillar Inc.
  • Inventors: Mark David Anderson, Michael Anthony Spielman, JR.
  • Filing Date: 2008-04-24
  • Issue Date: 2015-09-15
  • Abstract: A method of controlling a hydraulic system having a variable displacement pump operatively coupled to an engine. The method includes detecting a speed of the engine, and determining a desired power value of the pump. The method also includes identifying an allowable power value that may be expended by the pump at the detected speed. The method also includes selecting a pump power value. The selected pump power value is the lower of the allowable power value and the desired power value. The method further includes adjusting the pump to deliver the selected pump power value.

Here is a plain-language overview of each independent claim:

  • Claim 1 (Method of controlling a hydraulic system): This claim describes a method for managing a hydraulic system where an engine drives a pump that can change its output. The steps include:

    1. Measuring the engine's speed.
    2. Figuring out the amount of power the user wants the pump to provide.
    3. Consulting a pre-defined table or "map" to find the maximum power the pump is allowed to use at the detected engine speed.
    4. Choosing the lesser of these two power values (what the user wants vs. what's allowable).
    5. Adjusting the pump to deliver that chosen, limited power.

  • Claim 11 (Hydraulic system): This claim describes the components of a hydraulic system designed to control power delivery. It includes:

    1. An engine.
    2. A variable displacement pump, where the hydraulic power it delivers depends on how much its internal pistons move.
    3. A tool or attachment (implement) connected to the pump that uses its power.
    4. A sensor to measure the engine's speed.
    5. A control system that performs several functions:
      • It looks up an allowable power output for the pump based on a map that links this value to the engine's speed.
      • It determines the desired power output requested by the user for the implement.
      • It then adjusts the pump's piston movement to ensure the power delivered to the implement is the lower of the allowable power and the desired power.

  • Claim 15 (Method of operating a machine): This claim outlines a method for operating a machine that has an engine and a hydraulic implement powered by a pump. The method involves:

    1. Detecting a signal from the user (e.g., from a lever) that indicates how much power they want for the implement.
    2. Monitoring the engine's speed.
    3. Selecting an allowable power level for the implement from a map that correlates allowable power with the current engine speed.
    4. Adjusting the pump to deliver to the implement the lower of the desired power level and the allowable power level.

USPTO and CAFC 2026 Docket Search:
A search of the USPTO database indicates that US patent 9133837 is currently Active and is set to expire on 2034-03-13.
As of April 26, 2026, there are no results found in CAFC 2026 dockets specifically for patent number 9133837.US patent 9133837 has the following details:

  • Title: Method of controlling a hydraulic system
  • Assignee: Caterpillar Inc.
  • Inventors: Mark David Anderson, Michael Anthony Spielman, JR.
  • Filing Date: 2008-04-24
  • Issue Date: 2015-09-15
  • Abstract: A method of controlling a hydraulic system having a variable displacement pump operatively coupled to an engine. The method includes detecting a speed of the engine, and determining a desired power value of the pump. The method also includes identifying an allowable power value that may be expended by the pump at the detected speed. The method also includes selecting a pump power value. The selected pump power value is the lower of the allowable power value and the desired power value. The method further includes adjusting the pump to deliver the selected pump power value.

Here is a plain-language overview of each independent claim:

  • Claim 1 (Method of controlling a hydraulic system): This claim describes a method for managing a hydraulic system where an engine drives a pump that can change its output. The steps include:

    1. Measuring the engine's speed.
    2. Figuring out the amount of power the user wants the pump to provide.
    3. Consulting a pre-defined table or "map" to find the maximum power the pump is allowed to use at the detected engine speed.
    4. Choosing the lesser of these two power values (what the user wants vs. what's allowable).
    5. Adjusting the pump to deliver that chosen, limited power.

  • Claim 11 (Hydraulic system): This claim describes the components of a hydraulic system designed to control power delivery. It includes:

    1. An engine.
    2. A variable displacement pump, where the hydraulic power it delivers depends on how much its internal pistons move.
    3. A tool or attachment (implement) connected to the pump that uses its power.
    4. A sensor to measure the engine's speed.
    5. A control system that performs several functions:
      • It looks up an allowable power output for the pump based on a map that links this value to the engine's speed.
      • It determines the desired power output requested by the user for the implement.
      • It then adjusts the pump's piston movement to ensure the power delivered to the implement is the lower of the allowable power and the desired power.

  • Claim 15 (Method of operating a machine): This claim outlines a method for operating a machine that has an engine and a hydraulic implement powered by a pump. The method involves:

    1. Detecting a signal from the user (e.g., from a lever) that indicates how much power they want for the implement.
    2. Monitoring the engine's speed.
    3. Selecting an allowable power level for the implement from a map that correlates allowable power with the current engine speed.
    4. Adjusting the pump to deliver to the implement the lower of the desired power level and the allowable power level.

USPTO and CAFC 2026 Docket Search:
A search of the USPTO database indicates that US patent 9133837 is currently Active and is set to expire on 2034-03-13.
As of April 26, 2026, there are no results found in CAFC 2026 dockets specifically for patent number 9133837.

Generated 5/27/2026, 12:01:34 PM