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USPTO Patent Rankings Data through Sept 30, 2025
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Peter Kafarnik — 9 Patents

General Motors: 9 patents #1,725 of 18,328Top 10%
Eltville am Rhein, DE: #11 of 111 inventorsTop 10%
Overall (All Time): #576,937 of 4,157,543Top 15%
9 Patents All Time

Issued Patents All Time

Showing 1–9 of 9 patents

Patent #TitleCo-InventorsDate
8776762 HCCI mode switching control system and method Allen B. Rayl, Vijay Ramappan, Jun-Mo Kang, Hanho Yun 2014-07-15
8452520 Control system and method for low quantity fuel injection Vijay Ramappan, Jun-Mo Kang, Jonathan T. Shibata 2013-05-28
8322324 System and method for controlling transient switching between HCCI mode and SI mode of an engine Vijay Ramappan, Allen B. Rayl, Jonathan T. Shibata 2012-12-04
8326511 System and method for estimating torque output of a homogeneous charge compression ignition engine Jonathan T. Shibata, Allen B. Rayl, Andrew P. Bagnasco, Jun-Mo Kang 2012-12-04
8316818 HCCI mode switching control system and method Vijay Ramappan, Jun-Mo Kang 2012-11-27
8220436 HCCI/SI combustion switching control system and method Allen B. Rayl, Jun-Mo Kang, Vijay Ramappan, Matthew A. Wiles, Hanho Yun 2012-07-17
8036807 Control strategy for transitioning among combustion modes in an internal combustion engine Jun-Mo Kang, Chen-Fang Chang, Allen B. Rayl, Vijay Ramappan 2011-10-11
7975668 Spark timing and control during transitions between spark ignited combustion and homogenous charge compression ignition Vijay Ramappan, Allen B. Rayl, Jun-Mo Kang, Matthew A. Wiles, Hanho Yun 2011-07-12
7729844 HCCI combustion moding state control for fuel economy and seamless transitions Allen B. Rayl, Chen-Fang Chang, Jun-Mo Kang, Vijay Ramappan 2010-06-01