Description
Class C21C : PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL
Subclass 5/00: Manufacture of carbon steel, e.g. plain mild steel, medium carbon steel, or cast-steel
C21C 5/00
Sub-Class
Stats
- 28 US PATENTS IN FORCE
- 3 US APPLICATIONS PENDING
- 17 Total Patent Owners
- 150 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12138674 | High performance alloy for corrosion resistance | Jun 27, 23 | Nov 12, 24 | Saudi Arabian Oil Company |
| 12134799 | Method for producing chromium-containing molten iron | Mar 31, 20 | Nov 05, 24 | 501 Nippon Steel Corporation |
| 12024754 | Method for manufacturing a low-carbon nitrogen-containing austenitic stainless steel bar | Dec 08, 22 | Jul 02, 24 | DAYE SPECIAL STEEL CO., LTD. |
| 11851723 | Carbon-negative metallurgical products | Feb 17, 22 | Dec 26, 23 | Carbon Technology Holdings, LLC |
| 11794228 | High performance alloy for corrosion resistance | Mar 18, 21 | Oct 24, 23 | Saudi Arabian Oil Company |
| 11142814 | Ferritic-austenitic duplex stainless steel sheet | Jan 18, 18 | Oct 12, 21 | JFE Steel Corporation |
| 10451349 | Metallurgical container | Mar 09, 15 | Oct 22, 19 | PRIMETALS TECHNOLOGIES AUSTRIA GMBH |
| 10386119 | Method for operating a shaft furnace | Feb 27, 15 | Aug 20, 19 | THYSSENKRUPP AG |
| 10125413 | Method for producing manganese containing ferroalloy | Dec 16, 14 | Nov 13, 18 | OUTOTEC (FINLAND) OY |
| 9909810 | Immersion device for molten metal and steelmaking method | Jun 09, 16 | Mar 06, 18 | HERAEUS ELECTRO-NITE INTERNATIONAL N.V. |
| 9869002 | Method for manufacturing duplex stainless steel sheet having reduced inclusions | Dec 08, 15 | Jan 16, 18 | POSCO |
| 9732393 | Blowing spear for fabrication of metals and maintenance of loading and blowing operational conditions | Jul 08, 13 | Aug 15, 17 | LUMAR METALS LTDA. |
| 9663838 | Metal recovery method | Jul 25, 13 | May 30, 17 | NISSHIN STEEL CO., LTD. |
| 9650688 | Method of recovering Fe from steel-making slag | Mar 28, 14 | May 16, 17 | INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY |
| 9612027 | Cooling system for forming a mist and methods of repairing or replacing a component thereof | Jan 16, 14 | Apr 04, 17 | CIM TECHNOLOGY INC. |
| 9599400 | Apparatus and method to feed and preheat a metal charge to a melting furnace | Mar 07, 13 | Mar 21, 17 | DANIELI & C. OFFICINE MECCANICHE S.P.A. |
| 9581398 | Heat exchanger | Jan 28, 15 | Feb 28, 17 | KEIHIN THERMAL TECHNOLOGY CORPORATION |
| 9458518 | Starting a smelting process | Dec 06, 12 | Oct 04, 16 | TECHNOLOGICAL RESOURCES PTY. LIMITED |
| 9347108 | Advanced technology for iron-chrome alloys production and related plant | Feb 25, 14 | May 24, 16 | Not available |
| 9103007 | Zinc-modified ferritic stainless steels and manufacturing method thereof | Jan 29, 13 | Aug 11, 15 | NATIONAL TSING HUA UNIVERSITY |
Recent Publications
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2025/0084,495 | CARBON-NEGATIVE METALLURGICAL PRODUCTS | Oct 11, 24 | Mar 13, 25 | Not available |
| 2024/0294,997 | CARBON-NEGATIVE METALLURGICAL PRODUCTS | Apr 29, 24 | Sep 05, 24 | Not available |
| 2020/0291,497 | METHOD OF MAKING STAINLESS STEEL | Apr 01, 19 | Sep 17, 20 | Not available |
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 29 Months (last 2 years Issuances)
- 29 Months (last 5 years Issuances)