E02D 29/122
Steps or handrails for shafts
Official title: {Steps or handrails for shafts}
E02D29/122 (Steps or handrails for shafts) appears on 35 US grants and 29 published applications in this corpus.
Search patents in E02D- Granted patents
- 35
- Published applications
- 29
- Assignees
- 17
- Inventors
- 62
- Latest grant
- 6 Aug 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 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 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 1 |
| 2010 | 1 | 1 |
| 2011 | 1 | 2 |
| 2012 | 0 | 2 |
| 2013 | 2 | 2 |
| 2014 | 3 | 1 |
| 2015 | 2 | 1 |
| 2016 | 1 | 2 |
| 2017 | 3 | 4 |
| 2018 | 3 | 3 |
| 2019 | 3 | 0 |
| 2020 | 2 | 2 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 1 | 3 |
| 2024 | 2 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Underfloor storage vault6 Aug 2024US 12,054,906 B2Atlas Survival Shelters LLC
- Variable sliding manhole safety guard6 Aug 2024US 12,054,907 B2ESSYSTEM CO, Ltd
- Device for securing a rung in a concrete wall14 Nov 2023US 11,814,900 B2
- Safety hatch system9 Jun 2020US 10,676,966 B2Rooftop Anchor, Inc.
- Safety railing for utility hatch4 Feb 2020US 10,550,539 B1Madruga Iron Works, Inc.
- Underfloor Storage Vault30 Jan 2025US 2025/0034829 A1Atlas Survival Shelters LLC
- Variable sliding manhole safety guard26 Oct 2023US 2023/0340751 A1ESSYSTEM CO, Ltd
- Folding barrier assembly and method of use28 Sep 2023US 2023/0304250 A1Ohio Gratings, Inc.
- Underfloor Storage Vault16 Feb 2023US 2023/0049236 A1Atlas Survival Shelters LLC
- Device for securing a rung in a concrete wall16 Jul 2020US 2020/0224496 A1
Most cited
By later US patents
- Underground service bay for vehicles and process for constructing same127US 5,701,706 A1997
- Segmented adjustment riser37US 5,482,400 ANational Rubber Technology Inc. · 1996
- Aircraft servicing pit with retractable ladder36US 5,282,339 ADabico, Inc. · 1994
- Method and apparatus for lining manhole assemblies and the like35US 5,081,802 APoly-Tec Products, Inc. · 1992
- Manhole construction26US 4,023,590 AThe Oregon Drop Corporation · 1977