G01N 3/40
Investigating hardness or rebound hardness
G01N3/40 (Investigating hardness or rebound hardness) appears on 950 US grants and 790 published applications in this corpus.
Search patents in G01N- Granted patents
- 950
- Published applications
- 790
- Assignees
- 669
- Inventors
- 2,317
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 14 | 0 |
| 1978 | 10 | 0 |
| 1979 | 11 | 0 |
| 1980 | 10 | 0 |
| 1981 | 11 | 0 |
| 1982 | 11 | 0 |
| 1983 | 8 | 0 |
| 1984 | 10 | 0 |
| 1985 | 10 | 0 |
| 1986 | 8 | 0 |
| 1987 | 13 | 0 |
| 1988 | 7 | 0 |
| 1989 | 15 | 0 |
| 1990 | 10 | 0 |
| 1991 | 10 | 0 |
| 1992 | 12 | 0 |
| 1993 | 6 | 0 |
| 1994 | 20 | 0 |
| 1995 | 8 | 0 |
| 1996 | 15 | 0 |
| 1997 | 10 | 0 |
| 1998 | 13 | 0 |
| 1999 | 12 | 0 |
| 2000 | 14 | 0 |
| 2001 | 13 | 1 |
| 2002 | 19 | 13 |
| 2003 | 21 | 17 |
| 2004 | 21 | 20 |
| 2005 | 15 | 28 |
| 2006 | 18 | 29 |
| 2007 | 23 | 19 |
| 2008 | 14 | 20 |
| 2009 | 14 | 24 |
| 2010 | 15 | 31 |
| 2011 | 14 | 25 |
| 2012 | 29 | 24 |
| 2013 | 22 | 43 |
| 2014 | 24 | 40 |
| 2015 | 28 | 39 |
| 2016 | 33 | 44 |
| 2017 | 35 | 39 |
| 2018 | 41 | 48 |
| 2019 | 39 | 42 |
| 2020 | 33 | 37 |
| 2021 | 37 | 43 |
| 2022 | 37 | 46 |
| 2023 | 37 | 34 |
| 2024 | 32 | 30 |
| 2025 | 34 | 32 |
| 2026 | 18 | 22 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01N 3/42By performing impressions under a steady load by indentors563
- G01N 3/48By performing impressions under impulsive load by indentors120
- G01N 3/405By determining the vibration frequency of a sensing element in contact with46
- G01N 3/52By measuring extent of rebound of a striking body34
- G01N 3/54Performing tests at high or low temperatures24
- G01N 3/50By measuring rolling friction10
Recent patents
- Method for evaluating rock compressive strength based on cuttings mineral composition, nano-indentation, and friction tests22 Sep 2026US 12,742,713 B2Southwest Petroleum University
- Complex soil rotational penetrometer device25 Aug 2026US 12,716,186 B2The Government of the United States of America, as represented by the Secretary of the Navy
- Durometer equipped with a rotating head mounted on a tilting system11 Aug 2026US 12,704,445 B2
- Device and method to calibrate or verify the displacement-measurement system of an instrumented indenter11 Aug 2026US 12,704,447 B2KLA Corporation
- Acoustic emission-based indentation deformation monitoring system for indentation plastometry21 Jul 2026US 12,687,471 B2The Florida International University Board of Trustees
- Method and apparatus for determining the condition of a track bed by means of a tamping assembly1 Oct 2026US 2026/0297857 A1Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M. B. H.
- Method for evaluating rock compressive strength based on cuttings mineral composition, nano-indentation, and friction tests20 Aug 2026US 2026/0243642 A1Southwest Petroleum University
- Material testing for a bearing inner ring20 Aug 2026US 2026/0243643 A1Pratt & Whitney Canada Corp.
- Bioinks and methods of synthesizing, characterizing, and deploying bioinks23 Jul 2026US 2026/0207790 A1Voxcell Bioinnovation Inc.
- Universal apparatus for electrotribological testing of rolling elements16 Jul 2026US 2026/0202266 A1
Most cited
By later US patents
- Arthroscopic cartilage evaluator and method for using the same165US 5,503,162 ABoard of Regents, The University of Texas System · 1996
- Multi-dimensional capacitive transducer146US 5,869,751 AHysitron, Inc. · 1999
- Method and apparatus for recording three-dimensional topographies140US 5,771,310 AShriners Hospitals for Children · 1998
- Frequency deviation detecting circuit and measuring apparatus using the frequency deviation detecting circuit109US 5,766,137 AAxiom · 1998
- Method for optimizing drill bit design parameters108US 6,349,595 B1Smith International, Inc. · 2002