| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 3 | |
| #2 | Brazil | 2 | |
| #3 | Germany | 2 | |
| #4 | Japan | 2 | |
| #5 | Austria | 1 | |
| #6 | China | 1 | |
| #7 | German Democratic Republic | 1 | |
| #8 | EPO (European Patent Office) | 1 | |
| #9 | Spain | 1 | |
| #10 | France | 1 | |
| #11 | United Kingdom | 1 | |
| #12 | Italy | 1 | |
| #13 | Republic of Korea | 1 | |
| #14 | Mexico | 1 |
| # | Industry | |
|---|---|---|
| #1 | Materials and metallurgy | |
| #2 | Machines | |
| #3 | Engines, pumps and turbines | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Alloys | |
| #2 | Unspecified technologies | |
| #3 | Internal-combustion piston engines | |
| #4 | Venting or aerating devices | |
| #5 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Petry Wolfgang | 11 |
| #2 | Koehler Michael | 5 |
| #3 | Mihiaeru Keereru | 2 |
| #4 | Kohler Michael | 2 |
| #5 | Koehler Michael Dipl Ing | 1 |
| #6 | Koehler M | 1 |
| #7 | Buorufugangu Petori | 1 |
| #8 | Koehler Michael Dipl-Ing | 1 |
| #9 | Petry W | 1 |
| #10 | Uorufugangu Petori | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CN1005318B | Process for production of valve seat rings | |
| DE3413593C1 | Process for the production of valve seat rings | |
| DE2828513A1 | MATERIAL FOR THE POWDER METALLURGICAL PRODUCTION OF OBJECTS WITH HIGH WEAR RESISTANCE |