Kruse Sues Again; Accuses Isuzu of Infringing Diesel Engine Patents

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In a previous post, I wrote about Kruse Technology Partnership’s (“Kruse”) infringement suit against DMAX, Ltd. (“DMAX”), an Ohio diesel engine manaufacturer formed as a joint venture between GM and Isuzu.  

In that case, Kruse alleges that DMAX’s Duramax engines infringe three related Kruse patents:  U.S. Patent Nos. 5,265,562 (“‘562 patent”), 6,058,904 (“‘904 patent”) and 6,405,704 (“‘704 patent”).

Last month Kruse filed a second lawsuit, this time targeting Isuzu.  The complaint (kruse-isuzu-complaint.pdf), filed in federal court in Santa Ana, California, asserts the same patents and alleges that Isuzu’s diesel engines infringe the patents.

The asserted patents are directed to Kruse’s “Limited Temperature Cycle” technology, which reduces combustion temperature, boosts thermal efficiency and reduces certain chemical emissions by diesel engines by injecting fuel in multiple increments.   

The patents describe an engine (10) comprising a block (12), a cylinder head (14) and a cylinder (16) having a piston (18).  Fuel is supplied to the engine (10) by a fuel injection system (36).  The engine (10) also includes an air induction system (26) having an air intake valve (28) in the cylinder head (14).

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The process maintains a proper fuel/air mix in the engine to reduce the temperature and the work of compression.  According to the ‘904 patent, the fuel injection system (36) precisely regulates this fuel/air mixture for combustion and exhaust emission control.

The complaint requests that the court issue a permanent injunction against Isuzu and award Kruse compensatory damages for the alleged infringement.

Eric Lane Avatar

Eric Lane

Eric Lane, the founder and principal of Green Patent Law, is an intellectual property lawyer and registered U.S. patent attorney in New York and is a member of the bar in New York and California. Eric has more than two decades of experience working with wind, solar PV, CSP, biofuels, and geothermal, energy storage technologies, carbon capture and sequestration, medical devices, data communications, mechanical, chemical, internet and software.