Fumio Tsutsumi

Title: Fumio Tsutsumi: Innovator in Telephone Technology

Introduction

Fumio Tsutsumi is a notable inventor based in Takasaki, Japan. He has made significant contributions to the field of telecommunications, particularly in the development of key telephone systems. With a total of three patents to his name, Tsutsumi's work has had a lasting impact on how telephone signaling circuits operate.

Latest Patents

One of Tsutsumi's latest patents is a key telephone call signaling circuit. This invention is designed to control the connection of two different audio signal sources to a single audio signal transmission path. It allows for the broadcasting of audio signals over a telephone set loudspeaker while also managing the energization of indicators in the telephone set and at the main control circuit. Notably, this circuit utilizes only four conductors to connect the telephone set with the main control circuit, two of which serve as power supply conductors that can also supply other circuits.

Another significant patent is a pulse counting circuit. This circuit generates an electrical representation corresponding to the number of pulses in multiple pulse trains, with each pulse train containing a maximum of ten pulses. The counting process does not commence until a first pulse train with more than a preselected number of pulses is received. Subsequently, the circuit counts each pulse in the following pulse trains for a predetermined number of pulse trains. This invention is particularly useful in key telephone dial pulse signaling apparatus, functioning as a register circuit that is not affected by false pulses generated when lifting the handset.

Career Highlights

Throughout his career, Fumio Tsutsumi has worked with several companies, including Nippon Tsu Shin Kogyo K.K. and Tie Communications, Inc. His experience in these organizations has contributed to his expertise in telecommunications technology and innovation.

Collaborations

Tsutsumi has collaborated with notable individuals in the field, including Stephen E. Kerman and Fumikazu Hamatani. These partnerships have likely enriched his work and led to advancements in his inventions.

Conclusion

Fumio Tsutsumi's contributions to telephone technology through his innovative patents demonstrate his significant role as an inventor. His work continues to influence the telecommunications industry, showcasing the importance of innovation in enhancing communication systems.