Company Filing History:
6 out of 27,375 
3 out of 16,453 
1 out of 115 
Years Active: 1996-2010
Title: The Innovations of Stephen L Johnson
Introduction
Stephen L Johnson is a notable inventor based in Erdenheim, PA (US). He holds a total of 11 patents, showcasing his significant contributions to the field of technology and security systems. His work primarily focuses on methodologies that enhance inter-process communication and security architecture.
Latest Patents
One of Johnson's latest patents is titled "Methodologies to secure inter-process communication based on trust." This innovative system secures inter-process communication (IPC) by implementing a user quota mechanism that manages IPC resources. It allows a single user to allocate a fixed number of objects, ensuring that the total does not exceed the system maximum. The trusted IPC mechanism mediates access to IPC objects through signed executables, which are verified by a key and include a list of trusted keys. A trust relationship among connected subjects determines whether communication can occur between processes. For processes to communicate via IPC, mutual trust is required, or a kernel must trust one process, which in turn must trust the other.
Another significant patent is "Security architecture and mechanism to access and use security components in operating system." This architecture facilitates access to security components associated with an operating system. It comprises a policy tree that stores various security policies, each defined by system calls correlating to security operations and their corresponding components. A policy manager intercepts system calls from the operating system and determines the appropriate response based on the policy tree, which resides in a protected memory space.
Career Highlights
Throughout his career, Stephen L Johnson has worked with prominent companies such as Matsushita Electric Industrial Co., Ltd. and Panasonic Corporation. His experience in these organizations has contributed to his expertise in developing innovative security solutions.
Collaborations
Johnson has collaborated with notable individuals in the field, including Robert Fish and Dennis Bushmitch. These partnerships have likely enriched his work and led to further advancements in his inventions.
Conclusion
Stephen L Johnson's contributions to technology and security through his patents reflect his innovative spirit and dedication to enhancing communication systems. His work continues to influence the field, showcasing the importance of trust and security in modern technology.