Claims for Patent: 11,499,050

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Summary for Patent: 11,499,050

Title:	Process for the preparation of indigotindisulfonate sodium (indigo carmine)
Abstract:	This invention relates to an improved method for the preparation of highly or substantially pure Indigotindisulfonate sodium (1). It further relates to the novel crystalline form I of Indigotindisulfonate sodium (1) and the process for its preparation.
Inventor(s):	Manik Reddy Pullagurla, Jagadeesh Babu Rangisetty
Assignee:	Provepharm Life Solutions SA
Application Number:	US17/150,123
Patent Claims:	1. A crystalline Indigotindisulfonate sodium of formula (I) comprising one or more of the following i) less than 0.15% of compound A; ii) less than 0.15% of compound B; iii) less than 0.15% of compound C; iv) less than 2 ppm of arsenic and lead combined.

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