patentgrepDocs Get an API key

C09B 1/51

N-substituted amino-hydroxy anthraquinone

C09B1/51 (N-substituted amino-hydroxy anthraquinone) appears on 103 US grants and 36 published applications in this corpus.

Search patents in C09B

Granted patents: 103
Published applications: 36
Assignees: 53
Inventors: 232
Latest grant: 17 Jun 2025

Filings by year

C09B 1/51: granted patents and published applications per publication year
Year	Granted patents	Published applications
1976	9	0
1977	5	0
1978	10	0
1979	4	0
1980	3	0
1981	5	0
1982	4	0
1983	5	0
1984	5	0
1985	3	0
1986	3	0
1987	1	0
1988	3	0
1989	1	0
1990	3	0
1991	1	0
1992	1	0
1993	0	0
1994	0	0
1995	0	0
1996	0	0
1997	2	0
1998	0	0
1999	0	0
2000	1	0
2001	0	0
2002	4	1
2003	1	2
2004	1	3
2005	2	1
2006	2	4
2007	0	0
2008	1	1
2009	2	2
2010	2	2
2011	2	4
2012	2	4
2013	1	0
2014	1	1
2015	4	2
2016	1	0
2017	2	0
2018	0	0
2019	0	2
2020	0	0
2021	0	1
2022	1	1
2023	0	0
2024	3	4
2025	2	0
2026	0	1

By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.

Subgroups

Granted patents

Recent patents

Anthraquinone compound, liquid crystal composition containing said compound, and light-controlling element17 Jun 2025US 12,331,240 B2Nippon Kayaku Kabushiki Kaisha
Anthraquinone compound, liquid crystal composition containing said compound, and dimming element27 May 2025US 12,312,294 B2Nippon Kayaku Kabushiki Kaisha
Contact lens10 Dec 2024US 12,164,182 B2CooperVision International Limited
Anthraquinone compound-containing liquid crystal composition for controlling light, photocured product thereof, and light-controlling element3 Dec 2024US 12,157,851 B2Nippon Kayaku Kabushiki Kaisha
Anthraquinone compound-containing liquid crystal composition for controlling light, photocured product thereof, and light-controlling element12 Nov 2024US 12,139,656 B2Nippon Kayaku Kabushiki Kaisha

Most cited

By later US patents