Johann Graf

This inventor holds 8 USPTO granted patents and 1 published patent application and 5 EPO patents. Top assignees: Audi Ag, Siemens Aktiengesellschaft. Active years: 2003-2018.

USPTO Granted Patents = 8 (Patent Applications = 1)

% Patents Active = 37.5

EPO Patents = 5 (Patent Applications = 5)

Average Co-Inventor Count = 1.4

ph-index = 3

Forward Citations = 45(Granted Patents)

Company Filing History:

Siemens Aktiengesellschaft

patents

Years Active: 2003-2018

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8 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 9903255 - Coolant circuit for an internal combustion engine and method of operating a coolant circuit (2018-02-27),

2. 9611765 - Method for operating a valve train of an internal combustion engine and corresponding valve train (2017-04-04),

3. 8915127 - Method and apparatus for diagnosing a coolant pump for an internal combustion engine (2014-12-23),

4. 8589010 - Method for operating drive control units in a motor vehicle, and motor vehicle (2013-11-19),

5. 8569908 - Hybrid vehicle with immobilizer (2013-10-29),

6. 7762230 - Method for operating at least one drive motor of a motor vehicle (2010-07-27),

7. 6684689 - Method for diagnosing the adjustment device of a swirl control valve (2004-02-03),

8. 6619262 - Method for controlling an internal combustion engine (2003-09-16),

Title: Johann Graf: Innovator in Internal Combustion Engine Technology

Introduction

Johann Graf is a notable inventor based in Hausen, Germany. He has made significant contributions to the field of internal combustion engine technology, holding a total of 8 patents. His innovative work focuses on improving the efficiency and functionality of coolant circuits and valve trains in engines.

Latest Patents

One of Johann Graf's latest patents is a coolant circuit for an internal combustion engine and a method of operating this circuit. This invention allows coolant to circulate between the engine and a heat sink, utilizing a switchable valve that remains closed during cold starts. The valve can be adjusted based on the exhaust gas mass flow, with a control device that monitors the exhaust gas flow over time to optimize performance. Another significant patent involves a method for operating a valve train of an internal combustion engine. This invention features a main camshaft with a shiftable cam carrier, which is axially adjusted by an actuator. The actuator detects voltage changes during operation, ensuring precise control of the valve train.

Career Highlights

Throughout his career, Johann Graf has worked with prominent companies such as Audi AG and Siemens Aktiengesellschaft. His experience in these leading organizations has allowed him to develop and refine his innovative ideas in automotive technology.

Collaborations

Johann has collaborated with notable colleagues, including Michael Henn and Martin Steinbrueck. Their combined expertise has contributed to the advancement of engine technology and innovation.

Conclusion

Johann Graf's contributions to internal combustion engine technology through his patents and collaborations highlight his role as a significant inventor in the automotive industry. His work continues to influence the development of more efficient engine systems.