Company Filing History:
2 out of 2,297 
1 out of 832,891 Years Active: 1989-1991
Title: The Innovations of Stephen J. Shaffer
Introduction
Stephen J. Shaffer is an accomplished inventor based in Harvard, MA (US). He holds a total of 3 patents that showcase his contributions to the field of data processing systems. His work focuses on enhancing the efficiency and functionality of data management through innovative techniques.
Latest Patents
One of Shaffer's notable patents is the "Apparatus and method for prohibiting access in a multi-cache data." This invention aims to prevent simultaneous usage of selected data signal groups in a data processing system. The technique involves assigning a register cell to each location capable of storing a data signal group, which can be either in the main memory or in the cache memory units. When a data processing unit requests a data signal group, a control signal stored in the register cell prohibits usage by another processing unit. Once the activity concludes, the control signal is removed, making the data signal group available for other units.
Another significant patent is the "Split bus multiprocessing system with data transfer between main memory." This invention increases the utilization of the system bus in a data processing system with multiple data processing units. By dividing the system bus access operation into sub-operations and establishing a cyclic sequence for cache memory units, the efficiency of data transfer is enhanced. The main memory unit is equipped to execute write-modify-read operations efficiently, further optimizing the system's performance.
Career Highlights
Stephen J. Shaffer has worked with prominent companies, including Digital Equipment Corporation. His experience in these organizations has contributed to his expertise in data processing technologies and innovations.
Collaborations
Throughout his career, Shaffer has collaborated with notable individuals such as Richard A. Warren and Thomas W. Eggers. These partnerships have likely enriched his work and led to further advancements in his inventions.
Conclusion
Stephen J. Shaffer's contributions to data processing systems through his patents reflect his innovative spirit and technical expertise. His work continues to influence the field, showcasing the importance of advancements in technology.