H04S 3/006

In which a plurality of audio signals are transformed in a combination

Official title: {in which a plurality of audio signals are transformed in a combination of audio signals and modulated signals, e.g. CD-4 systems}

H04S3/006 (In which a plurality of audio signals are transformed in a combination) appears on 90 US grants and 66 published applications in this corpus.

Search patents in H04S

Granted patents: 90
Published applications: 66
Assignees: 53
Inventors: 143
Latest grant: 4 Aug 2026

Filings by year

H04S 3/006: granted patents and published applications per publication year
Year	Granted patents	Published applications
1976	18	0
1977	4	0
1978	5	0
1979	1	0
1980	1	0
1981	0	0
1982	0	0
1983	0	0
1984	0	0
1985	0	0
1986	0	0
1987	0	0
1988	0	0
1989	0	0
1990	0	0
1991	0	0
1992	0	0
1993	0	0
1994	0	0
1995	0	0
1996	0	0
1997	0	0
1998	4	0
1999	0	0
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	1	2
2005	0	0
2006	1	2
2007	0	1
2008	1	2
2009	0	2
2010	2	0
2011	0	0
2012	0	2
2013	0	2
2014	3	7
2015	2	3
2016	6	5
2017	7	5
2018	3	5
2019	7	7
2020	8	4
2021	2	3
2022	5	3
2023	1	4
2024	4	2
2025	2	3
2026	2	2

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

Recent patents

Most cited

By later US patents