Company Filing History:
4 out of 384 
1 out of 196 Years Active: 1988-1999
Title: Yasuyuki Iwase: Innovator in Liquid Applicator Technology
Introduction
Yasuyuki Iwase is a notable inventor based in Fujioka, Japan. He has made significant contributions to the field of liquid applicators, holding a total of 5 patents. His innovative designs have enhanced the functionality and efficiency of various writing instruments and applicators.
Latest Patents
One of Iwase's latest patents is an applicator that features a barrel body and a holder with a ball house. This design includes an ejecting opening at the front end, allowing liquid to flow out. A ball is held in the ball house, partially exposed through the ejecting opening, while a spherical evading member is positioned on the rear side of the ball. This evading member has a smaller diameter than the ball, and a ball seat is located in the rear part of the ball house to receive the evading member. The applicator also includes a liquid conduit with longitudinal grooves and a pressing means to urge the evading member forward.
Another significant patent is a valve unit for writing instruments or liquid applicators. This valve unit is designed to apply liquid to articles and includes a spring support with front and rear openings. The front opening features an annular projection that serves as a sealing means. The valve seat has a cylindrical portion and a seat portion, while the valve stem is equipped with an edged piston portion that slides closely against the cylindrical portion of the valve seat. A valve spring resiliently urges the valve stem to close the valve unit.
Career Highlights
Yasuyuki Iwase has worked with prominent companies in the industry, including Mitsubishi Pencil Company, Limited and Mitsubishi Pencil Kabushiki Kaisha. His experience in these organizations has allowed him to refine his skills and contribute to the development of innovative products.
Collaborations
Iwase has collaborated with notable coworkers such as Yoshiaki Akaishi and Masaomi Muranishi. Their combined expertise has likely played a role in the successful development of Iwase's patents.
Conclusion
Yasuyuki Iwase is a distinguished inventor whose work in liquid applicator technology has led to several innovative patents. His contributions continue to influence the industry and enhance the functionality of writing instruments.