B28B 7/28
Cores
Official title: Cores; Mandrels {(B28B1/44 takes precedence; of special materials in general B28B7/34; cores for making blind holes in situ E04G15/04; for making recesses E04G15/06)}
B28B7/28 (Cores) appears on 216 US grants and 193 published applications in this corpus.
Search patents in B28B- Granted patents
- 216
- Published applications
- 193
- Assignees
- 142
- Inventors
- 356
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 6 | 0 |
| 1978 | 7 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 3 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 0 |
| 2002 | 1 | 3 |
| 2003 | 0 | 5 |
| 2004 | 4 | 6 |
| 2005 | 3 | 8 |
| 2006 | 2 | 6 |
| 2007 | 3 | 6 |
| 2008 | 3 | 7 |
| 2009 | 1 | 4 |
| 2010 | 4 | 6 |
| 2011 | 7 | 6 |
| 2012 | 4 | 9 |
| 2013 | 2 | 10 |
| 2014 | 9 | 7 |
| 2015 | 7 | 15 |
| 2016 | 9 | 7 |
| 2017 | 9 | 9 |
| 2018 | 9 | 11 |
| 2019 | 7 | 9 |
| 2020 | 10 | 8 |
| 2021 | 5 | 11 |
| 2022 | 6 | 8 |
| 2023 | 5 | 7 |
| 2024 | 7 | 8 |
| 2025 | 12 | 11 |
| 2026 | 5 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Airforming constructive system29 Sep 2026US 12,746,707 B2
- Multi-piece mandrel for building up airfoil structure18 Aug 2026US 12,709,985 B2Rtx Corporation
- Systems and methods for manufacturing in-situ hollow core / hollow core analogue slabs, walls, and columns4 Aug 2026US 12,697,751 B2
- Needled ceramic matrix composite cooling passages10 Mar 2026US 12,570,580 B2Rtx Corporation
- Methods for complex geometry mandrel removal of ceramic matrix composite components20 Jan 2026US 12,528,228 B2Rtx Corporation
- Multi-level segmented mandrel system and method for composite shapes with negative draft1 Oct 2026US 2026/0295900 A1Rtx Corporation
- Cavity consolidation apparatus27 Aug 2026US 2026/0250210 A1General Electric Company
- Printable concrete structure mold for concrete structures16 Apr 2026US 2026/0102942 A11Print LLC
- Mold part for manufacturing toothed vertical joints of keystones and mold comprising the mold part12 Mar 2026US 2026/0070258 A1Nordex Energy Spain, S.A.U.
- Mandrel extraction system and method5 Mar 2026US 2026/0061666 A1Rtx Corporation
Most cited
By later US patents
- Biaxial concrete masonry casting apparatus122US 4,909,717 ANational Concrete Masonry Association · 1990
- Method for making antiqued concrete cored bricks and capping bricks119US 5,183,616 AHedrick Concrete Products Corp. · 1993
- Core body for the recessed positioning of an anchor element in a concrete member64US 4,383,674 A1983
- Reef ball53US 5,564,369 A1996
- Mold box apparatus49US 4,218,206 A1980