B28B 21/765
Top or bottom rings
Official title: {Top or bottom rings}
B28B21/765 (Top or bottom rings) appears on 16 US grants and 19 published applications in this corpus.
Search patents in B28B- Granted patents
- 16
- Published applications
- 19
- Assignees
- 5
- Inventors
- 20
- Latest grant
- 14 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 2 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 2 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 1 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 1 |
| 2019 | 0 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
| 2025 | 2 | 3 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Adjustable magnetic support stand for pallet14 Oct 2025US 12,441,025 B2Hawkeyepedershaab Concrete Technologies, Inc.
- Form for vertically casting flared end products and method of manufacturing the same22 Jul 2025US 12,365,113 B2Hawkeyepedershaab Concrete Technologies, Inc.
- System and method for producing concrete products by a casting method13 Aug 2024US 12,059,820 B2
- Method for producing concrete pipes15 Aug 2023US 11,724,417 B2
- Composite pallet for concrete pipe18 Oct 2016US 9,469,053 B2Hawkeye Concrete Products Co.
- Adjustable Magnetic Support Stand for Pallet16 Jul 2026US 2026/0200131 A1Hawkeyepedershaab Concrete Technologies, Inc.
- Adjustable Magnetic Support Stand for Pallet8 Jan 2026US 2026/0008203 A1Hawkeyepedershaab Concrete Technologies, Inc.
- Form for vertically casting flared end products and method of manufacturing the same16 Oct 2025US 2025/0319629 A1Hawkeyepedershaab Concrete Technologies, Inc.
- Adjustable Magnetic Support Stand for Pallet24 Jul 2025US 2025/0236048 A1Hawkeyepedershaab Concrete Technologies, Inc.
- Form for vertically casting flared end products and method of manufacturing the same6 Mar 2025US 2025/0073950 A1Hawkeyepedershaab Concrete Technologies, Inc.
Most cited
By later US patents
- Concrete manhole22US 4,592,674 A1986
- Supporting ring for use in the casting of concrete pipes4US 4,047,693 APedershaab Maskinfabrik A/S · 1977
- Gripping device4US 4,799,724 AFirma Dipl.-Ing. Karl Rekers Maschinenbau · 1989
- Mold insert for forming precast concrete modules4US 5,259,586 A1993
- Pipe joint4US 5,280,972 AForsheda AB · 1994