Company Filing History:
1 out of 16 
1 out of 51 Years Active: 1978-1979
Title: Philippe-Hubert De Rivet: Innovator in Data Protection Systems
Introduction
Philippe-Hubert De Rivet is a notable inventor based in Paris, France. He has made significant contributions to the field of data protection in information systems. With a total of two patents to his name, his work focuses on enhancing the security and efficiency of computer processes.
Latest Patents
De Rivet's latest patents revolve around the protection of data in an information multiprocessing system. One of his key innovations involves a method for preventing processes from interfering with each other or sharing each other's address space in an unauthorized manner. This is achieved through hardware and firmware solutions that restrict addressability to a segmented memory and implement a ring protection mechanism. The system utilizes four ring classes, numbered 0 through 3, where each ring represents a different level of system privilege. The innermost ring, level 0, has the highest privilege, while level 3, the outermost ring, has the least. Each procedure in the system is assigned a minimum and maximum execute ring number, which determines who may legally call the procedure. Additionally, maximum write and read ring numbers specify the permissible operations for each process. The hardware checks ensure that processes can only access their designated address space, preventing unauthorized data access.
Career Highlights
Throughout his career, Philippe-Hubert De Rivet has worked with prominent companies such as Compagnie Honeywell Bull and Compagnie Internationale Pour L'Informatique CII-Honeywell Bull. His experience in these organizations has contributed to his expertise in computer systems and data protection.
Collaborations
De Rivet has collaborated with notable individuals in the field, including John J. Bradley and Benjamin S. Franklin. These partnerships have likely enriched his work and expanded his impact on the industry.
Conclusion
Philippe-Hubert De Rivet is a distinguished inventor whose work in data protection systems has advanced the field of information technology. His innovative patents and career achievements reflect his commitment to enhancing computer security and efficiency.