US 11,845,867 B2Granted

Process for the preparation of indigotindisulfonate sodium (indigo carmine)

AssigneeProvepharm Life Solutions

InventorsManik Reddy Pullagurla, Jagadeesh Babu Rangisetty

Life of this patent

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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.

Claims16

Dependent claims

Indigotindisulfonate sodium of formula (I) in a crystalline form having a purity greater than 99.0% by HPLC at 245 nm

Dependencies are inferred from the claim text.

Facts

Application: 18/045,584Filed 11 Oct 2022 · continuation
Priority: IN 20164104415423 Dec 2016
Published: US 2023/0093526 A123 Mar 2023
Granted: 19 Dec 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

C09B 7/02
Indigoid dyes: bis-indole indigos
C09B 67/0025
Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents…
C09B
Organic dyes or closely-related compounds for producing dyes

Family

PCT/IN2017/050615Parent of this division · filed 23 Dec 2017
Application17/150,123Parent of this continuation · filed 15 Jan 2021
US 10,927,258 B2Parent of this division · filed 3 Feb 2021
US 2023/0093526 A1Pre-grant publication · published 23 Mar 2023
US 11,499,050 B2Parent of this continuation
Application16/471,999Parent of this division
Application17/150,123Parent of this division
US 2020/0017689 A1Published application
US 2021/0206978 A1Published application
US 11,845,867 B2This patent

From the US filing history. Foreign family members aren’t listed.

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