B28B 21/60
Prestressed reinforcements
Official title: prestressed reinforcements
B28B21/60 (Prestressed reinforcements) appears on 24 US grants and 10 published applications in this corpus.
Search patents in B28B- Granted patents
- 24
- Published applications
- 10
- Assignees
- 21
- Inventors
- 43
- Latest grant
- 31 Jan 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 1 | 3 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 2 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for manufacturing segments for a tower, prestressed segment, tower ring, tower, wind turbine, and prestressing device31 Jan 2023US 11,566,605 B2Wobben Properties GmbH
- Pre-stressed concrete pipe17 Jan 2023US 11,555,562 B1
- Strengthened polyethylene tubular member9 Jul 2019US 10,344,904 B2Milliken Infrastructure Solutions, LLC
- Method for forming an elongate support structure7 Feb 2017US 9,561,632 B2Vijay Investments Pty Ltd.
- Pre-stress corrosion-resistant tubular pile used in special coastal geological conditions and manufacturing method6 Sep 2016US 9,435,095 B2Jiangsu Dongpu Pile. Co., Ltd.
- Core wall-thinning design method for prestressed high-performance concrete cylinder pipe22 Jan 2026US 2026/0022072 A1Zhengzhou University
- Novel pre-stressed concrete cylinder pipe with pre-embedded acoustic emission sensor and distributed optical fiber, and manufacturing and monitoring methods thereof15 Jan 2026US 2026/0016448 A1Beijing Hanjianheshan Pipeline Co., Ltd
- Method for manufacturing segments for a tower, prestressed segment, tower ring, tower, wind turbine, and prestressing device10 Jun 2021US 2021/0172426 A1Wobben Properties GmbH
- Strengthened polyethylene tubular member14 Feb 2019US 2019/0049057 A1Milliken Infrastructure Solutions, LLC
- Ultrathin concrete composite pipe with oriented and localized fiber15 Feb 2018US 2018/0045339 A1Hawkeyepedershaab Concrete Technologies, Inc.
Most cited
By later US patents
- Application of inwardly directed prestressing pressure to concrete members14US 4,771,530 AGeneral Atomics · 1988
- Concrete pipes13US 3,950,465 AAmey Roadstone Corporation Limited · 1976
- Bevel pipe winder9US 3,964,522 AUnited States Pipe and Foundry Company · 1976
- Method of manufacturing prestressed concrete pipe9US 4,113,823 ANippon Hume Pipe Company Limited · 1978
- Concrete pipes8US 3,945,782 AAmey Roadstone Corporation Limited · 1976