US 10697398

The search results from the CAFC website do not directly list specific dockets for US patent 10697398 in 2026. They provide general information on how to find case information, including case filings and records, and mention PACER as a resource. The provided patent text already indicated general litigation and a PTAB case (IPR2025-01271), which is an inter partes review before the Patent Trial and Appeal Board, not a CAFC case directly. District court cases were also mentioned. To confirm CAFC dockets for 2026, a more direct search within PACER or contacting the Clerk's Office would be necessary, but this is outside the scope of the current tool's capabilities. Based on the current search, there is no direct confirmation of CAFC dockets specifically for 2026 for this patent.

Therefore, I will proceed with summarizing the patent information and noting the lack of specific CAFC 2026 dockets.

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US Patent 10697398: Concise Summary

• Title: Batteryless dual fuel engine with liquid fuel cut-off
• Assignee: Champion Power Equipment Inc.
• Inventors: Kendall J. Collie, Mark J. Sarder, Aleko D. Sotiriades, James J. Dehn, Leigh Jenison, Hiroaki Sato
• Filing Date: October 28, 2015
• Issue Date: June 30, 2020
• Abstract: A dual fuel engine includes an engine operable on a gaseous fuel and a liquid fuel and a switch to change operation of the engine between gaseous fuel and liquid fuel. The dual fuel engine also includes a carburetor attached to an intake of the engine to mix air and fuel and connect to a gaseous fuel source and a liquid fuel source. A liquid fuel cut-off attaches to the carburetor to interrupt liquid fuel upon actuation of the switch from liquid fuel to gaseous fuel.

Plain-Language Overview of Independent Claims (based on "Brief Description of the Invention"):

Please note: The full, legal text of the claims was not provided in the authoritative patent text. The following overview is based on the "Brief Description of the Invention" section, which summarizes key aspects of the invention.

1. Dual Fuel Engine with Liquid Fuel Cut-off: This claim describes a dual fuel engine that can run on either a gaseous fuel or a liquid fuel. It has a carburetor connected to both fuel sources. A key feature is a switch to select the fuel type, and a liquid fuel cut-off mechanism that stops the flow of liquid fuel to the carburetor when the engine is switched from liquid fuel to gaseous fuel.
2. Batteryless Dual Fuel Generator with Fuel Shutoff: This claim focuses on a batteryless dual fuel generator. It includes a pull-start engine connected to an alternator, capable of running on gaseous or liquid fuel. The carburetor has a float bowl and a fuel passage for liquid fuel. The generator also features a switch for fuel selection and a fuel shutoff that closes the liquid fuel passage in the carburetor when gaseous fuel operation is selected.
3. Carburetor with Non-Linear Fuel Shutoff: This claim details a carburetor equipped with a fuel shutoff. The carburetor has a float bowl, a throat, and a fuel passage for liquid fuel. The fuel shutoff has an internal part that closes the fuel passage and an external part for actuation. A distinctive aspect is that the internal fuel shutoff operates (opens and closes the fuel passage) without linear motion.
4. Method of Assembling a Dual Fuel Engine: This claim outlines a method for putting together a dual fuel engine. It involves providing an engine that can use both gaseous and liquid fuels. A carburetor is attached to the engine's intake to deliver these fuels, having a throat, float bowl, and liquid fuel passage. The method includes connecting a gaseous fuel source to the throat and a liquid fuel source to the float bowl. Finally, a fuel selection switch is coupled to the engine, and a liquid fuel cut-off is attached to the carburetor to halt liquid fuel flow when the switch is set for gaseous fuel.

CAFC 2026 Dockets:

As of April 26, 2026, a search for US patent 10697398 in the CAFC 2026 dockets did not yield specific case filings directly referencing this patent. While the patent is noted to have ongoing litigation (including a PTAB case IPR2025-01271 and several district court cases in Wisconsin, Nevada, California, and Arizona), direct evidence of a 2026 CAFC docket related to this patent was not found in the accessible search results.