History
Markush structures are named after Eugene A. Markush, founder of the Pharma Chemical Corporation in New Jersey. He was involved in a legal case that set a precedent for generic chemical structure patent filing. The patent filing was US Application 611,637, filed January 9, 1923. Markush was awarded a patent from the US Patent Office for ''“Pyrazolone Dye and Process of Making the Same”'' on August 26, 1924.Use in patents
In describing a chemical, a Markush structure allows the patent-holder to list several active/effective structural formulas.United States
Patent applicants in the United States are required to reveal their best known embodiment implementing their invention. However, the "best mode" requirement can no longer be used as a basis for invalidity or denying patentability. Separately, patent claims in the United States can be rejected or invalidated as indefinite for failing to particularly point out and distinctly claim the subject matter of the invention.See also
* Molecule editor *References
External links
* {{commons category-inline, Markush structures Chemical structures