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A21B 1/33

Ovens heated directly by combustion products

Official title: Ovens heated directly by combustion products (A21B1/04 takes precedence)

A21B1/33 (Ovens heated directly by combustion products) appears on 30 US grants and 31 published applications in this corpus.

Search patents in A21B

Granted patents: 30
Published applications: 31
Assignees: 22
Inventors: 63
Latest grant: 22 Sep 2026

Filings by year

A21B 1/33: granted patents and published applications per publication year
Year	Granted patents	Published applications
1977	1	0
1978	0	0
1979	0	0
1980	0	0
1981	0	0
1982	0	0
1983	0	0
1984	0	0
1985	0	0
1986	1	0
1987	0	0
1988	1	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	0	0
1999	0	0
2000	0	0
2001	0	0
2002	0	1
2003	1	0
2004	1	0
2005	0	0
2006	0	0
2007	0	1
2008	0	0
2009	0	1
2010	0	0
2011	0	0
2012	2	2
2013	1	1
2014	2	4
2015	1	1
2016	2	0
2017	2	2
2018	1	3
2019	1	2
2020	1	1
2021	1	3
2022	2	4
2023	3	2
2024	1	3
2025	2	0
2026	3	0

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

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