US 11698687

Here's a concise summary of US patent 11698687, based on the provided authoritative patent text and an updated search for its legal status:

US Patent 11698687

• Title: Electronic device for use in motion detection and method for obtaining resultant deviation thereof
• Assignee: CM HK Ltd
• Inventors: Shun-Nan Liou, Zhou Ye, Chin-Lung Li
• Filing Date: 2020-11-20
• Issue Date: 2023-07-11
• Abstract: The patent describes a method for motion detection in an electronic device. It involves generating measured angular velocities and axial accelerations. A "previous quaternion" (a mathematical representation of orientation) at a prior time (T-1) is established based on past acceleration and angular velocity measurements. This is used to convert current measured angular velocities into a "current quaternion" and "predicted axial accelerations." These predicted accelerations are then compared with the actual measured axial accelerations at the current time (T) to get a comparison result. This result, along with the current quaternion, is used to derive an "updated quaternion" for the current time T, which then becomes the "previous quaternion" for the next cycle. Finally, content is provided based on the resulting deviation derived from this updated quaternion in a spatial reference frame.

Plain-Language Overview of Independent Claims:

• Independent Claim 1: This claim describes a method for determining how an electronic device moves and rotates in a 3D space, especially in changing environments, while filtering out unwanted disturbances. The method involves:

  1. Starting with a known orientation (a "previous quaternion") from an earlier time.
  2. Measuring the device's current rotation speeds (angular velocities) and using these, along with the previous orientation, to predict its new orientation (a "current quaternion") and what its accelerations should be.
  3. Measuring the device's actual accelerations.
  4. Comparing the predicted accelerations with the actual measured accelerations to correct for errors.
  5. Using this correction to refine the predicted orientation, creating an "updated quaternion." This updated orientation then serves as the starting point for the next measurement cycle.
  6. Calculating the device's actual movement and rotation angles (like yaw, pitch, and roll) from this updated orientation, effectively removing disturbances.

• Independent Claim 11: This claim describes an electronic device designed to detect motion and calculate its deviation. The device includes:

  1. A nine-axis motion sensor module (combining a rotation sensor for angular velocities, an accelerometer for axial accelerations, and a magnetometer for magnetism).
  2. A processor connected to the sensor module. This processor is programmed to:
     • Obtain a "previous state" (orientation) from an earlier time.
     • Get current rotation speeds from the sensor.
     • Get current actual accelerations from the sensor.
     • Calculate predicted accelerations based on the current rotation speeds.
     • Compare these predicted and measured accelerations to generate an "updated state" (refined orientation) for the device.
     • Convert this updated state into the device's resultant movement and rotation angles in 3D space, excluding external disturbances.

• Independent Claim 15: This claim describes another method for determining the movement and rotation angles of a 3D pointing device, using a nine-axis motion sensor module in dynamic environments. This method is similar to Claim 1 but explicitly incorporates magnetometer data for a more robust compensation:

  1. Starting with a "previous state" (orientation) at an earlier time.
  2. Obtaining current measured rotation speeds from the sensor.
  3. Obtaining current measured axial accelerations from the sensor.
  4. Calculating predicted axial accelerations based on the current rotation speeds.
  5. Obtaining current measured magnetism from the sensor.
  6. Calculating predicted magnetism based on the current rotation speeds.
  7. Comparing the current state with both the measured accelerations/magnetism and the predicted accelerations/magnetism to obtain an "updated state." This process aims to filter out external interferences.
  8. Calculating the resultant movement and rotation angles in 3D space from this updated state.

USPTO and CAFC Status (as of April 26, 2026):

The patent 11698687 is listed as Active.

According to Google Patents, there is active litigation related to this patent:

• PTAB Case: IPR2025-01071 has been filed and is currently "Pending - Instituted." The petitioner is Unified Patents.
• US District Court Cases:
  • A case was filed in the Texas Eastern District Court.
  • Two cases were filed in the California Eastern District Court.

Due to the nature of the CAFC dockets search (requiring specific filters and not yielding direct results from a broad Google search), and the fact that the provided Google Patents data already cites specific litigation (including a PTAB case and District Court cases), this existing information is the most authoritative and up-to-date available within the given constraints. Directly searching public CAFC dockets for 2026 and this specific patent number through a general search often yields no direct links without more specific case identifiers (e.g., party names, full case numbers). The Google Patents entry provides the relevant litigation context, including the PTAB case number and the districts for the US cases.