B32B 2250/40
Symmetrical or sandwich layers
Official title: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
B32B2250/40 (Symmetrical or sandwich layers) appears on 3,332 US grants and 5,557 published applications in this corpus.
Search patents in B32B- Granted patents
- 3,332
- Published applications
- 5,557
- Assignees
- 2,204
- Inventors
- 10,707
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 13 | 0 |
| 1978 | 12 | 0 |
| 1979 | 6 | 0 |
| 1980 | 3 | 0 |
| 1981 | 7 | 0 |
| 1982 | 13 | 0 |
| 1983 | 9 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 16 | 0 |
| 1991 | 16 | 0 |
| 1992 | 16 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 6 | 0 |
| 1997 | 17 | 0 |
| 1998 | 11 | 0 |
| 1999 | 6 | 0 |
| 2000 | 4 | 0 |
| 2001 | 21 | 2 |
| 2002 | 16 | 13 |
| 2003 | 8 | 11 |
| 2004 | 15 | 45 |
| 2005 | 8 | 41 |
| 2006 | 15 | 196 |
| 2007 | 27 | 88 |
| 2008 | 22 | 63 |
| 2009 | 39 | 101 |
| 2010 | 45 | 82 |
| 2011 | 61 | 82 |
| 2012 | 33 | 118 |
| 2013 | 52 | 130 |
| 2014 | 64 | 160 |
| 2015 | 65 | 183 |
| 2016 | 90 | 221 |
| 2017 | 112 | 353 |
| 2018 | 150 | 431 |
| 2019 | 259 | 420 |
| 2020 | 301 | 488 |
| 2021 | 289 | 451 |
| 2022 | 291 | 479 |
| 2023 | 320 | 471 |
| 2024 | 318 | 387 |
| 2025 | 329 | 324 |
| 2026 | 189 | 217 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Multi-material sheathing system6 Oct 2026US 12,752,520 B2Owens Corning Intellectual Capital, LLC
- Laminate and frozen food container and packaging6 Oct 2026US 12,752,521 B2Earth Create Co., Ltd.
- Illuminable laminated glazing for a vehicle and vehicle comprising such a glazing6 Oct 2026US 12,752,609 B2Saint-Gobain Sekurit France
- Method for the production of a polyurethane sandwich element6 Oct 2026US 12,753,284 B2Covestro Deutschland AG
- High strength composite structure and method of production6 Oct 2026US 12,753,700 B2
- Ice protection panel system8 Oct 2026US 2026/0306936 A1Signature Systems Group, LLC
- Fire-resistant pad8 Oct 2026US 2026/0307375 A1LG Energy Solution, Ltd.
- Hot mopped asphalt roofing systems incorporating polyisocyanurate coverboards1 Oct 2026US 2026/0295967 A1Johns Manville
- Sandwich panel structure and method of manufacturing sandwich panel structure1 Oct 2026US 2026/0295972 A1Mitsubishi Electric Corporation
- Lamination of two glass sheets by injection1 Oct 2026US 2026/0295978 A1Agc Glass Europe
Most cited
By later US patents
- Woven constructs with interlocked standing fibers858US 10,271,849 B2Ethicon, Inc. · 2019
- Compressible adjuncts with bonding nodes852US 10,172,620 B2Ethicon, Inc. · 2019
- Compressible adjunct assemblies with attachment layers823US 10,307,160 B2Ethicon, Inc. · 2019
- Compressible adjunct808US 10,285,699 B2Ethicon, Inc. · 2019
- Implantable layer comprising plastically deformed fibers796US 10,327,777 B2Ethicon, Inc. · 2019