B21D 53/20
Washers
Official title: washers, e.g. for sealing
B21D53/20 (Washers) appears on 41 US grants and 44 published applications in this corpus.
Search patents in B21D- Granted patents
- 41
- Published applications
- 44
- Assignees
- 41
- Inventors
- 72
- Latest grant
- 15 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 4 |
| 2009 | 1 | 4 |
| 2010 | 0 | 4 |
| 2011 | 1 | 3 |
| 2012 | 4 | 4 |
| 2013 | 1 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 2 |
| 2018 | 1 | 5 |
| 2019 | 3 | 5 |
| 2020 | 1 | 3 |
| 2021 | 3 | 1 |
| 2022 | 3 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 1 |
| 2025 | 1 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Self-controllable load spring washer15 Apr 2025US 12,274,862 B2Becton, Dickinson and Company
- Washer and washer manufacturing method4 Oct 2022US 11,460,067 B2Taiho Kogyo Co., Ltd.
- Manufacturing method for slinger used in rotary seal, and rotary seal23 Aug 2022US 11,421,741 B2Nakanishi Metal Works Co., Ltd.
- Method of manufacturing washer and washer24 May 2022US 11,339,828 B2Taiho Kogyo Co., Ltd.
- Process of forming and a seal for an engine2 Nov 2021US 11,161,207 B2Dynamic Metals, LLC
- Packing material cartridge28 May 2026US 2026/0146681 A1A. W. Chesterton Company
- Self-Controllable Load Spring Washer26 Jun 2025US 2025/0205428 A1Becton, Dickinson and Company
- Terminal part for a secondary cell20 Feb 2025US 2025/0062506 A1Northvolt AB
- Packing material cartridge22 Aug 2024US 2024/0280190 A1A. W. Chesterton Company
- Washer and method for manufacturing the same25 May 2023US 2023/0158561 A1
Most cited
By later US patents
- Method of producing semicircular washers having a projection to prevent rotation42US 4,310,939 ADaido Metal Company Ltd. · 1982
- Method for selectively forming (plastic working) at least one region of a sheet metal layer made from a sheet of spring steel, and a device for carrying out this method33US 8,336,359 B2ElringKlinger AG · 2012
- Lock washer26US 8,186,919 B2Saint Technologies, Inc. · 2012
- Method of forming a joined pair of wedge-action lock washers23US 4,538,313 ANobex Corporation · 1985
- Bowed external spring retaining ring of the E-shaped type19US 4,886,408 AWaldes Truarc, Inc. · 1989