Company Filing History:
5 out of 1,807 
2 out of 864 
2 out of 9 
Years Active: 1987-1997
Title: Innovations of Sadao Chigira: Leading Patents in Invisible Marking Technology
Introduction
Sadao Chigira, an accomplished inventor based in Chiba, Japan, has made significant strides in the field of invisible marking technology. With a total of five patents to his name, Chigira has contributed valuable innovations that are poised to enhance information security and identification processes across various industries.
Latest Patents
Chigira's latest patents showcase his expertise in creating advanced methods for reading and forming invisible markings. One notable patent is a method for reading invisible markings, which involves printing information on a substrate capable of transmitting infrared rays within the wavelength range of 2-10 μm. This method utilizes a special marking ink containing tin oxide and indium-tin mixed oxide, along with additional compounds such as alumina and silicon dioxide. A key feature of this invention is its ability to allow easy identification of the printed information using a CCD camera or infrared detector, regardless of the substrate's surface reflectance.
Another patent focuses on the formation of invisible markings, where information is printed on the substrate using a similar marking ink. Infrared rays are then applied to measure infrared absorptivities, enabling the identification of the invisibly marked information. This innovation is particularly beneficial as it maintains clarity and accuracy even in challenging visual conditions.
Career Highlights
Throughout his professional journey, Sadao Chigira has worked with renowned companies, including Fujikura Limited and Kansai Paint Company, Ltd. His experience within these organizations has facilitated his innovative endeavors and helped him refine his technical expertise in materials and printing technologies.
Collaborations
Chigira has collaborated with notable individuals in his field, including Kazuo Sanada and Tsutomu Maruyama. These partnerships have proven fruitful in developing his patentable technologies and furthering innovation in invisible marking methodologies.
Conclusion
Sadao Chigira's contributions to the realm of invisible marking technology demonstrate his commitment to innovation and advancement. With his patents, he is not only pushing the boundaries of what is possible in information safeguarding but also paving the way for future developments in the field. His work will undoubtedly leave a lasting impact on various industries that rely on secure identification methods.