F42D 1/08
Tamping methods
Official title: Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
F42D1/08 (Tamping methods) appears on 346 US grants and 280 published applications in this corpus.
Search patents in F42D- Granted patents
- 346
- Published applications
- 280
- Assignees
- 188
- Inventors
- 648
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 10 | 0 |
| 1978 | 5 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 7 | 0 |
| 1985 | 8 | 0 |
| 1986 | 6 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 6 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 6 | 0 |
| 1999 | 5 | 0 |
| 2000 | 6 | 0 |
| 2001 | 6 | 0 |
| 2002 | 8 | 3 |
| 2003 | 5 | 5 |
| 2004 | 2 | 4 |
| 2005 | 5 | 4 |
| 2006 | 2 | 7 |
| 2007 | 1 | 8 |
| 2008 | 4 | 5 |
| 2009 | 3 | 3 |
| 2010 | 5 | 11 |
| 2011 | 6 | 12 |
| 2012 | 9 | 4 |
| 2013 | 10 | 10 |
| 2014 | 7 | 6 |
| 2015 | 5 | 15 |
| 2016 | 7 | 13 |
| 2017 | 11 | 19 |
| 2018 | 7 | 10 |
| 2019 | 19 | 17 |
| 2020 | 14 | 17 |
| 2021 | 7 | 21 |
| 2022 | 18 | 14 |
| 2023 | 13 | 16 |
| 2024 | 27 | 21 |
| 2025 | 15 | 19 |
| 2026 | 15 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F42D 1/10Feeding explosives in granular or slurry form164
- F42D 1/22Methods for holding or positioning for blasting cartridges or tamping cartridges78
- F42D 1/18Plugs for boreholes48
- F42D 1/24Characterised by the tamping material29
- F42D 1/20Tamping cartridges, i.e. cartridges containing tamping material24
- F42D 1/12Feeding tamping material by pneumatic or hydraulic pressure9
- F42D 1/14Hand-operated tamping or loading8
Recent patents
- Apparatus and method for stemming blast holes6 Oct 2026US 12,753,003 B2
- Blasthole stemming based on formaldehyde resins, system and charging method6 Oct 2026US 12,754,001 B2Oxiquim S.A.
- External homogenization systems and methods related thereto6 Oct 2026US 12,754,002 B2Dyno Nobel Asia Pacific Pty Limited
- Explosive cartridge delivery tube14 Jul 2026US 12,680,800 B2Shan Xi Hui Feng Special Motor Vehicle Co., Ltd.
- Systems and methods for determining water depth and explosive depth in blastholes7 Jul 2026US 12,674,386 B2Dyno Nobel Asia Pacific Pty Limited
- Blasting accessories8 Oct 2026US 2026/0309474 A1Steel King Trust
- Inflatable down hole bag24 Sep 2026US 2026/0286806 A1Mti Group Pty Ltd
- Systems, apparatuses, and methods for delivering explosive compositions into boreholes24 Sep 2026US 2026/0287317 A1Orica International Pte Ltd
- Triggering explosives in holes17 Sep 2026US 2026/0276352 A1Olitek Pty Ltd
- Systems for delivering explosives and methods related thereto17 Sep 2026US 2026/0276360 A1Dyno Nobel Inc.
Most cited
By later US patents
- Explosive well tool firing head52US 8,136,439 B22012
- Formulating and delivery system for emulsion blasting40US 4,526,633 AIreco, Inc. · 1985
- Hose feeding winch38US 4,066,093 ANitro Nobel AB · 1978
- Explosive pipe severing tool38US 6,959,765 B2Titan Specialties, Ltd. · 2005
- Controlled fracture method and apparatus for breaking hard compact rock and concrete materials37US 5,098,163 ASunburst Recovery, Inc. · 1992