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Azur A

(7-aminophenothiazin-3-ylidene)-dimethylazanium chloride · also: Sinitest, Azuresin, Giemsa stain, giemsa-stain, Diagnex Blue, Mancha Giemsa

FormulaC14H14ClN3S
Mol. weight291.797
PubChem CID13735
InChIKeyNALREUIWICQLPS-UHFFFAOYSA-N
SMILESC[N+](=C1C=CC2=NC3=C(C=C(C=C3)N)SC2=C1)C.[Cl-]
6,965Patents
119Research papers
949Patents - last 3 years
6Papers - last 3 years

Who owns the IP

The organizations most actively patenting around this compound, ranked by referenced patent volume.

#AssigneePatents
110X Genomics Inc155
2LG Chem Ltd90
3Covestro Deutschland AG75
4Kimberly Clark Worldwide Inc69
5SmithKline Beecham Corp52
6F Hoffmann La Roche AG51
7Labrador Diagnostics LLC48
8Arkray Inc46
9Massachusetts Institute of Technology46
10Procter and Gamble Co41

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This preview shows the leading assignees. Cypris reveals the full ownership landscape - every filing entity, filing trends, and portfolio momentum.

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Where innovation is concentrated

Patent classifications ranked by volume reveal the technical domains with the most active filing.

#CodeAreaPatents
1A61KMedicinal preparations2,929
2A61PTherapeutic activity (drug indications)2,734
3G01NInvestigating / analysing materials1,811
4C12NMicroorganisms, enzymes1,079
5C07KPeptides1,056
6C12QMeasuring/testing involving enzymes873
7C07DHeterocyclic compounds614
8Y02AClimate change adaptation612
9A61LSterilising / disinfecting materials462
10Y10SCross-reference (legacy)252

AI mapped opportunity space

This preview shows where patent activity concentrates. Cypris maps the full classification landscape to surface technical whitespace and IP headroom.

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Most-cited patents

Patents ranked by forward citations reveal the foundational inventions the field continues to build on.

TitleYearAssigneeCited by
GRAPHIC DIAGNOSIS PROBE FOR DISEASE ACCEPTING ACCUMULATING AMYLOID BY AZURE A ANALOG COMPOUND AND COMPOSITION FOR GRAPHIC DIAGNOSIS CONTAINING THE SAME2000BF KENKYUSHO:KK14
A kind of method of quick carry out Rui Shi Giemsa stainings2018SUZHOU FENGTAI MEDICAL SUPPLIES TRADING CO., LTD.8
Method for purifying electronic mediator azure C2022Genclonn Biotech (Hangzhou) Co.,Ltd.1
Method for detecting quality of Rui-Giemsa staining solution and method for improving quality of Rui-Giemsa staining solution2023HENAN CELNOVTEBIO BIOTECHNOLOGY. Inc.0
Method for purifying electronic mediator azure C2022Genclonn Biotech (Hangzhou) Co.,Ltd.0

Where research is gaining momentum

Research themes ranked by publication activity show where scientific interest is accelerating around this compound.

#Research topicPapers
1Food Quality and Safety Studies1
2Quinazolinone synthesis and applications1

Who's driving the science

The most-published authors working with this compound, alongside their primary affiliations.

#AuthorAffiliationPapers
1Guangwen CaoNanjing University4
2Qingcai Jiao4
3Victor C. YangUniversity of Michigan4
4Encarnación LorenzoUniversidad Autónoma de Madrid3
5F. ParienteUniversidad Autónoma de Madrid3
6Gopinatha Suresh KumarIndian Institute of Chemical Biology3
7Robert A. DrongowskiUniversity of Michigan3
8Tania García‐MendiolaUniversidad Autónoma de Madrid3
9C. Gómez-AnquelaUniversidad Autónoma de Madrid2
10C.-L. C. TengUniversity of Michigan2

Research leaders

This preview lists the top authors. Cypris surfaces the full researcher landscape, their affiliations, and how scientific influence is shifting.

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The literature that defines it

The most-cited papers anchoring the scientific record for this compound.

Frequently asked questions

Common questions about this compound's patent and research landscape, answered from the underlying data.

What is the chemical composition and molecular formula of Azur A?

Azur A has the molecular formula C14H14ClN3S and a molecular weight of 291.797. Its canonical chemical name is (7-aminophenothiazin-3-ylidene)-dimethylazanium chloride, and it is also known by several other names including Azure A chloride, Dimethylthionine, and Giemsa stain.

Which organizations hold the most patents related to Azur A?

The leading patent assignees for Azur A are 10X Genomics Inc with 155 patents, LG Chem Ltd with 90 patents, and Covestro Deutschland AG with 75 patents. Other significant patent holders include Kimberly Clark Worldwide Inc, SmithKline Beecham Corp, and F Hoffmann La Roche AG.

What patent classifications dominate the Azur A patent landscape?

The most prevalent CPC subclasses in Azur A patents are A61K (pharmaceutical preparations) with 2929 patents, A61P (specific therapeutic activity of chemical compounds) with 2734 patents, and G01N (investigating or analyzing materials by determining their chemical or physical properties) with 1811 patents. These reflect strong emphasis on pharmaceutical and diagnostic applications.

What recent research topics have been published on Azur A?

Recent academic papers on Azur A have addressed photocatalytic degradation of Azure dyes using nano TiO2, potentiation of photoinactivation of bacteria mediated by phenothiazinium dyes, and metachromatic dye applications for identification of skeletal muscle fiber types. The compound has also been studied in contexts including dendrimer-based drug delivery and mitochondrial function applications.

How has patent activity for Azur A evolved in recent years?

Patent filings related to Azur A have shown significant growth, with 213 patents filed in 2016 rising to 403 in 2024. There was particularly strong activity in 2022–2024, with 350, 395, and 403 patents respectively. The last three years (2022–2024) account for 959 of the total 6965 patents in the database, representing approximately 14% of all Azur A-related patent activity.

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