Osvaldo Roberto Do Vale

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Rio de Janeiro, BR

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Patents Grantslast 30 patents

Information Patent Grant
Helical separator
- Patent number 6,036,749
- Issue date Mar 14, 2000
- Petroleo Brasileiro S.A. - Petrobras
- Geraldo Afonso Spinelli Martins Ribeiro
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
POLYVALENT RISER BALCONY
- Publication number 20230374870
- Publication date Nov 23, 2023
- Petroleo Brasileiro S.A. - PETROBRAS
- Helvio FERREIRA DA SILVA
- E21 - EARTH DRILLING MINING