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For the Inventor, By the Inventor

Takarazuka, Japan

Shigenari Katayama

USPTO Granted Patents = 13

Average Co-Inventor Count = 5.5

ph-index = 5

Forward Citations = 57(Granted Patents)


Location History:

  • Takarazuka, JA (1976 - 1977)
  • Takarazauka, JP (1980)
  • Takarazuka, JP (1979 - 1983)

Company Filing History:

goldMedal13 out of 6,892 
 
Sumitomo Chemical Company, Limited
 patents

Years Active: 1976-1983

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13 patents (USPTO):Explore Patents
1. 4387223 - Process for preparing 2(1H)-quinazolinone derivatives (1983-06-07),
2. 4202974 - Process for preparing 3,4-dihydro-2(1H)-quinazolinone derivatives (1980-05-13),
3. 4148796 - .gamma.-Piperidinobutyrophenones (1979-04-10),
4. 4065565 - Acylhydrazones and anti-psychotic compositions thereof (1977-12-27),
5. 4048168 - Process for preparing 1-polyhaloalkyl-3,4-dihydro-2-(1H)-quinazolinones (1977-09-13),
6. 4012515 - Aryl ketones and production thereof (1977-03-15),
7. 4012514 - Aryl ketones and production thereof (1977-03-15),
8. 4009173 - Butyrophenone derivatives (1977-02-22),
9. 4001312 - Aminoalcohols (1977-01-04),
10. 3993780 - Phenoxyethylamine derivatives having central nervous system depressant (1976-11-23),
11. 3979390 - Butyrophenone derivatives and production thereof (1976-09-07),
12. 3936468 - Phenylbutanol derivatives (1976-02-03),
13. 3933824 - Piperazinobutyrophenone derivatives (1976-01-20),

Title: Shigenari Katayama: Innovator in Quinazolinone Derivatives

Introduction

Shigenari Katayama is a prominent inventor based in Takarazuka, Japan. He has made significant contributions to the field of chemistry, particularly in the development of quinazolinone derivatives. With a total of 13 patents to his name, Katayama's work has garnered attention for its potential pharmacological applications.

Latest Patents

Among his latest patents, Katayama has developed a process for preparing 2(1H)-quinazolinone derivatives. This innovative method allows for the production of 2(1H)-quinazolinone and quinazolinethione derivatives with excellent pharmacological activities, achieved through heating the corresponding 3,4-dihydro-2(1H)-quinazolinone or quinazolinethione derivatives with sulfur in an inert solvent. Additionally, he has patented a process for preparing 3,4-dihydro-2(1H)-quinazolinone derivatives. This process yields high-purity compounds such as 1-cyclopropylmethyl-4-phenyl-6-methoxy-3,4-dihydro-2(1H)-quinazolinone and its thione derivative by heating arylurea or thiourea with aldehydes in the presence of hydrobromic acid.

Career Highlights

Shigenari Katayama is currently associated with Sumitomo Chemical Company, Limited, where he continues to innovate and contribute to the field of chemical research. His work has not only advanced scientific knowledge but also holds promise for the development of new therapeutic agents.

Collaborations

Throughout his career, Katayama has collaborated with notable colleagues, including Hisao Yamamoto and Masaru Nakao. These partnerships have facilitated the exchange of ideas and expertise, further enhancing the impact of their collective research efforts.

Conclusion

Shigenari Katayama's contributions to the field of quinazolinone derivatives exemplify the importance of innovation in chemistry. His patents reflect a commitment to advancing pharmacological research, and his collaborations highlight the value of teamwork in scientific discovery.

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