C21C 1/10
Making spheroidal graphite cast-iron
C21C1/10 (Making spheroidal graphite cast-iron) appears on 239 US grants and 96 published applications in this corpus.
Search patents in C21C- Granted patents
- 239
- Published applications
- 96
- Assignees
- 156
- Inventors
- 450
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 14 | 0 |
| 1978 | 7 | 0 |
| 1979 | 9 | 0 |
| 1980 | 20 | 0 |
| 1981 | 7 | 0 |
| 1982 | 7 | 0 |
| 1983 | 9 | 0 |
| 1984 | 7 | 0 |
| 1985 | 13 | 0 |
| 1986 | 5 | 0 |
| 1987 | 11 | 0 |
| 1988 | 9 | 0 |
| 1989 | 7 | 0 |
| 1990 | 11 | 0 |
| 1991 | 1 | 0 |
| 1992 | 7 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 4 | 2 |
| 2002 | 3 | 1 |
| 2003 | 3 | 3 |
| 2004 | 1 | 5 |
| 2005 | 2 | 4 |
| 2006 | 3 | 3 |
| 2007 | 1 | 2 |
| 2008 | 2 | 2 |
| 2009 | 1 | 1 |
| 2010 | 1 | 2 |
| 2011 | 0 | 1 |
| 2012 | 1 | 5 |
| 2013 | 1 | 4 |
| 2014 | 2 | 5 |
| 2015 | 1 | 4 |
| 2016 | 2 | 5 |
| 2017 | 5 | 4 |
| 2018 | 1 | 6 |
| 2019 | 2 | 7 |
| 2020 | 3 | 8 |
| 2021 | 2 | 1 |
| 2022 | 6 | 9 |
| 2023 | 4 | 2 |
| 2024 | 5 | 5 |
| 2025 | 2 | 3 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process and system for the production of iron nuggets12 May 2026US 12,624,406 B2Carbontec Energy Corporation
- Spheroidal graphite cast iron, cast article and automobile structure part made thereof, and method for producing spheroidal graphite cast iron article13 Jan 2026US 12,522,901 B2Proterial, Ltd.
- Additive for treating molten iron to produce cast iron with zero contraction and with Lonsdaleite-type spheroidal graphite5 Aug 2025US 12,378,618 B2
- Vermicular cast iron alloy, combustion engine block and head5 Aug 2025US 12,378,646 B2Tupy S. A.
- Method for producing an improved ductile iron alloy with pearlitic matrix20 Aug 2024US 12,065,723 B2Verdeloong Enterprises Pty. Ltd.
- Cast iron comprising niobium particles and method for producing cast iron30 Apr 2026US 2026/0117348 A1Instituto HercíLio Randon
- High mechanical strength and high thermal conductivity vermicular cast iron alloy, high mechanical strength and high thermal conductivity vermicular cast iron alloy manufacturing process, and internal combustion engine part15 Jan 2026US 2026/0015698 A1Tupy S. A.
- Additive for treating molten iron to produce cast iron with zero contraction and with lonsdaleite-type spheroidal graphite11 Sep 2025US 2025/0283187 A1
- Grade of ductile iron with reinforced ferritic matrix17 Apr 2025US 2025/0122600 A1Sediver
- Composite additive for forming inclusions with core-shell structure, preparation method and smelting method6 Feb 2025US 2025/0043371 A1Sino-Energy Huayuan Floating Wind Institute
Most cited
By later US patents
- Immersion and vaporization chamber107US 4,496,393 AGeorge Fischer Ltd. · 1985
- Method and apparatus for the treatment of iron with a reactant86US 4,509,979 AModern Equipment Company · 1985
- Cast iron inoculant and method for production of cast iron inoculant25US 6,102,983 AElkem ASA · 2000
- Addition of magnesium to molten metal24US 3,957,502 AMagnesium Elektron Limited · 1976
- Additive for use in refining iron23US 4,137,072 AToyo Soda Manufacturing Co., Ltd. · 1979