C21C 2250/00
Specific additives
Official title: Specific additives; Means for adding material different from burners or lances
C21C2250/00 (Specific additives) appears on 25 US grants and 24 published applications in this corpus.
Search patents in C21C- Granted patents
- 25
- Published applications
- 24
- Assignees
- 28
- Inventors
- 89
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 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 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 2 |
| 2011 | 0 | 2 |
| 2012 | 2 | 0 |
| 2013 | 1 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 3 |
| 2016 | 1 | 1 |
| 2017 | 1 | 3 |
| 2018 | 1 | 1 |
| 2019 | 2 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 1 |
| 2022 | 1 | 1 |
| 2023 | 0 | 2 |
| 2024 | 2 | 1 |
| 2025 | 1 | 2 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Blowing control method for maintaining mushroom head of bottom-blowing nozzle converter10 Mar 2026US 12,571,061 B2Soochow University
- Additive for treating molten iron to produce cast iron with zero contraction and with Lonsdaleite-type spheroidal graphite5 Aug 2025US 12,378,618 B2
- Method for smelting low nitrogen steel using electric furnace25 Jun 2024US 12,018,341 B2Baoshan Iron & Steel Co., Ltd.
- System and method for porous plug removal and installation2 Jan 2024US 11,858,033 B2J.H. Fletcher & Co.
- Method for recycling used or discarded portable electric batteries16 Aug 2022US 11,417,893 B2Eco'ring
- Apparatus and method for refining liquid metal24 Sep 2026US 2026/0284739 A1Danieli & C. Officine Meccaniche SpA
- Composition of charcoal for use in production of steel, process of foaming slag in the production of steel in electric arc furnaces and use of a composition of charcoal3 Sep 2026US 2026/0258517 A1Vallourec SoluçõEs Tubulares Do Brasil S.A.
- Method and apparatus for metals, alloys, mattes, or enriched and cleaned slags production from predominantly oxide feeds16 Oct 2025US 2025/0320570 A1Hertha Metals, Inc.
- Additive for treating molten iron to produce cast iron with zero contraction and with lonsdaleite-type spheroidal graphite11 Sep 2025US 2025/0283187 A1
- Method and apparatus for metals, alloys, mattes, or enriched and cleaned slags production from predominantly oxide feeds25 Jan 2024US 2024/0026476 A1Hertha Metals, Inc.
Most cited
By later US patents
- Converter process for the production of iron26US 5,518,523 ATechnological Resources Pty. Limited · 1996
- Process for gasification of solid carbonaceous material16US 4,388,084 ASumitomo Metal Industries, Ltd. · 1983
- Gasification process of solid carbonaceous material14US 4,389,246 ASumitomo Metal Industries, Ltd. · 1983
- Method for making iron-chromium alloys6US 4,177,061 AASEA Aktiebolag · 1979
- Method for an improved energy input into a scrap bulk4US 6,030,431 AL'Air Liquide, Societe Anonyme pour l'Etude et l'Expolitation des Procedes George Claude · 2000