John H Marsden

Title: John H. Marsden: Pharmaceutical and Agricultural Chemistry Patents.

Introduction

John H. Marsden was an inventor associated with Manchester, Great Britain, and Imperial Chemical Industries Limited. His patent work covered chemical processes and compounds with potential pharmaceutical and agricultural applications. The supplied information lists 2 patents.

Latest Patents

Marsden’s listed patents include “Process for Making 4-Methyl-4,5-Dihydrotetrazolo [1,5-a] Quinazolin-5-one.” The patent describes a preparation process that reacts anthranilic acid with cyanamide, treats the resulting product with hydrazine hydrate, forms a tetrazole through diazotization, and then methylates it. Its stated improvement is the use of n-butanol as the organic solvent during the hydrazine reaction.

His other listed patent, “Thienopyrimidines,” concerns a family of chemical compounds with varied substituents and forms, including optical isomers, tautomers, and salts. The disclosure identifies potential uses in regulating plant growth and combating fungal, viral, and bacterial plant diseases, as well as insect pests.

Career Highlights

Marsden’s listed inventions reflect work on both synthetic chemistry and compounds intended for practical applications. The process patent focuses on a specific solvent choice in a multistep chemical preparation, while the thienopyrimidine patent describes a broader class of compounds and their potential agricultural uses. The supplied information associates his work with Imperial Chemical Industries Limited.

Collaborations

The supplied information names Norman Elmore and Norman Harrison as Marsden’s coworkers. It does not specify their roles or the details of any joint patent work.

Conclusion

John H. Marsden’s listed patents connect chemical synthesis with potential pharmaceutical and agricultural applications, documenting his inventive work at Imperial Chemical Industries Limited.