B28B 21/566
Climbing elements
Official title: {Climbing elements}
B28B21/566 (Climbing elements) appears on 9 US grants and 2 published applications in this corpus.
Search patents in B28B- Granted patents
- 9
- Published applications
- 2
- Assignees
- 5
- Inventors
- 11
- Latest grant
- 19 Sep 2006
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 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 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Manhole insert for manufacture of a cast member and to provide a step insert having increased structural and holding strength19 Sep 2006US 7,108,101 B1Poly-Tec Products, Inc.
- Core segment for concrete forming apparatus21 Oct 1986US 4,618,122 AGeorg Prinzing GmbH & Co. KG Betonformen-und Maschinenfabrik
- Moulding apparatus for shaping concrete parts9 Sep 1986US 4,610,422 AGeorg Prinzing GmbH & Co. KG Betonformen-und Maschinenfabrik
- Method and apparatus for forming concrete articles containing one or more projecting elements13 May 1986US 4,588,544 AGeorg Prinzing GmbH & Co. KG Betonformen- and Maschinenfabrik
- Step driver31 Jan 1984US 4,428,522 AConcrete Pipe & Products Corp.
Most cited
By later US patents
- Method of installing manhole safety steps and plugs therefor31US 4,241,543 A1980
- Apparatus for forming steps in manholes and the like20US 3,974,615 AA-Lok Corporation · 1976
- Manhole insert for manufacture of a cast member and to provide a step insert having increased structural and holding strength18US 7,108,101 B1Poly-Tec Products, Inc. · 2006
- Moulding apparatus for shaping concrete parts10US 4,610,422 AGeorg Prinzing GmbH & Co. KG Betonformen-und Maschinenfabrik · 1986
- Ladder rung implanter1US 3,989,177 A1976