H01G 4/221
Characterised by the composition of the impregnant
Official title: {characterised by the composition of the impregnant}
H01G4/221 (Characterised by the composition of the impregnant) appears on 122 US grants and 14 published applications in this corpus.
Search patents in H01G- Granted patents
- 122
- Published applications
- 14
- Assignees
- 47
- Inventors
- 128
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 2 | 0 |
| 1978 | 9 | 0 |
| 1979 | 7 | 0 |
| 1980 | 4 | 0 |
| 1981 | 7 | 0 |
| 1982 | 7 | 0 |
| 1983 | 7 | 0 |
| 1984 | 7 | 0 |
| 1985 | 12 | 0 |
| 1986 | 11 | 0 |
| 1987 | 7 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 5 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 4 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 2 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 1 | 1 |
| 2021 | 1 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 2 |
| 2024 | 0 | 2 |
| 2025 | 0 | 1 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Dielectric nanofluid for a capacitor system15 Sep 2026US 12,738,421 B2Eaton Intelligent Power Limited
- Capacitor with multiple elements for multiple replacement applications17 Mar 2026US 12,580,132 B2HVAC South, LLC
- Electronic component13 Jan 2026US 12,525,395 B2Murata Manufacturing Co., Ltd.
- Capacitor with multiple elements for multiple replacement applications7 Dec 2021US 11,195,663 B2AmRad Manufacturing, LLC
- Super dielectric capacitor having electrically and ionically conducting electrodes14 Jan 2020US 10,535,466 B1The United States of America as represented by the Secretary of the Navy
- Rapid Solution Combustion Synthesis of Highly Ordered Porous Metal Oxide Layers2 Jul 2026US 2026/0188580 A1The Board of Trustees of the Leland Stanford Junior University
- Methods and systems for capacitor impregnation22 Jan 2026US 2026/0024701 A1
- Capacitor with multiple elements for multiple replacement applications24 Jul 2025US 2025/0239413 A1AmRad Manufacturing, LLC
- Film suitable for capacitor use16 May 2024US 2024/0161979 A1Oji Holdings Corporation
- Electronic component9 May 2024US 2024/0153703 A1Murata Manufacturing Co., Ltd.
Most cited
By later US patents
- Electrical insulating oil and oil-filled electrical appliances166US 4,618,914 ANippon Petrochemicals Company, Limited · 1986
- Metallized polymer film capacitor having a high viscosity polyurethane oil insulating fluid99US 6,014,308 AAmerican Radionic Company, Inc. · 2000
- Dielectric fluid77US 4,420,791 AEmhart Industries, Inc. · 1983
- Dielectric fluid for a capacitor75US 4,459,637 AEmhart Industries, Inc. · 1984
- Dielectric fluid for a capacitor73US 4,642,731 AEmhart Industries, Inc. · 1987