G01V 3/24
Using ac
Official title: using AC
G01V3/24 (Using ac) appears on 313 US grants and 261 published applications in this corpus.
Search patents in G01V- Granted patents
- 313
- Published applications
- 261
- Assignees
- 71
- Inventors
- 427
- Latest grant
- 6 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 5 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 4 | 0 |
| 1987 | 7 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 5 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 6 | 0 |
| 2001 | 2 | 0 |
| 2002 | 4 | 6 |
| 2003 | 4 | 5 |
| 2004 | 5 | 3 |
| 2005 | 5 | 8 |
| 2006 | 7 | 8 |
| 2007 | 4 | 13 |
| 2008 | 11 | 14 |
| 2009 | 7 | 13 |
| 2010 | 8 | 14 |
| 2011 | 14 | 20 |
| 2012 | 17 | 12 |
| 2013 | 8 | 18 |
| 2014 | 15 | 14 |
| 2015 | 13 | 18 |
| 2016 | 9 | 15 |
| 2017 | 23 | 24 |
| 2018 | 15 | 11 |
| 2019 | 18 | 5 |
| 2020 | 12 | 10 |
| 2021 | 7 | 14 |
| 2022 | 11 | 4 |
| 2023 | 10 | 8 |
| 2024 | 7 | 2 |
| 2025 | 4 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Circuit and apparatus for generating signal source for impedance measurement of rock and ore samples6 Jan 2026US 12,517,278 B2Giant Sequoia Ai Technology (Changsha) Limited
- High voltage protection and receiver saturation prevention apparatus with high voltage peeking functions for downhole logging17 Jun 2025US 12,331,633 B2Halliburton Energy Services.Inc.
- Combined processing of borehole imagers and dielectric tools10 Jun 2025US 12,326,389 B2Halliburton Energy Services.Inc.
- Formation analysis incorporating identification of immovable and viscous hydrocarbons4 Mar 2025US 12,242,017 B2Schlumberger Technology Corporation
- Apparatus and method for measuring thickness of tubings in downhole applications7 Jan 2025US 12,188,995 B2GOWell International, LLC
- Non-invasive characterization of wells11 Jun 2026US 2026/0160917 A1Halliburton Energy Services.Inc.
- Detection of low resistivity pay zones using spectral induced polarization method5 Jun 2025US 2025/0180769 A1King Fahd University of Petroleum and Minerals
- Circuit and apparatus for generating signal source for impedance measurement of rock and ore samples29 Aug 2024US 2024/0288604 A1Giant Sequoia Ai Technology (Changsha) Limited
- Electromagnetic measurements in a curved wellbore11 Jul 2024US 2024/0230944 A1Schlumberger Technology Corporation
- Instrument structure and measuring method for cross-casing resistivity tool26 Oct 2023US 2023/0341580 A1
Most cited
By later US patents
- Method and apparatus for determining shaliness and oil saturations in earth formations using induced polarization in the frequency domain297US 4,359,687 AShell Oil Company · 1982
- Induced polarization method and apparatus for distinguishing dispersed and laminated clay in earth formations291US 4,769,606 AShell Oil Company · 1988
- Apparatus for focused electrode induced polarization logging288US 4,583,046 AShell Oil Company · 1986
- Method for induced polarization logging287US 4,658,215 AShell Oil Company · 1987
- Method for correcting an electrical log for the presence of shale in a formation283US 4,398,151 AShell Oil Company · 1983