H01T 4/20
Arrangements for improving potential distribution
H01T4/20 (Arrangements for improving potential distribution) appears on 33 US grants and 20 published applications in this corpus.
Search patents in H01T- Granted patents
- 33
- Published applications
- 20
- Assignees
- 23
- Inventors
- 84
- Latest grant
- 9 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 3 |
| 2015 | 0 | 0 |
| 2016 | 2 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 2 |
| 2019 | 0 | 2 |
| 2020 | 3 | 1 |
| 2021 | 1 | 1 |
| 2022 | 2 | 2 |
| 2023 | 0 | 3 |
| 2024 | 3 | 1 |
| 2025 | 3 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Graded spark gap design for internally gapped surge arrester9 Dec 2025US 12,494,308 B2Hubbell Incorporated
- Spark gap assembly for overvoltage protection and surge arrester15 Jul 2025US 12,362,542 B2Hubbell Incorporated
- Spark gap arrangement4 Mar 2025US 12,244,123 B2Phoenix Contact GmbH & Co.KG
- Multi-spark gap12 Nov 2024US 12,142,897 B2Phoenix Contact GmbH & Co.KG
- Spark gap arrangement with ignition apparatus for protecting a high-voltage device and ignition apparatus therefor17 Sep 2024US 12,095,237 B2Siemens Energy Global GmbH & Co. KG
- Graded spark gap design for internally gapped surge arrester27 Aug 2026US 2026/0253768 A1
- Spark gap assembly for overvoltage protection and surge arrester6 Nov 2025US 2025/0343398 A1
- Spark gap assembly for overvoltage protection and surge arrester12 Sep 2024US 2024/0305067 A1Hubbell Incorporated
- Spark gap arrangement2 Nov 2023US 2023/0352914 A1Phoenix Contact GmbH & Co.KG
- Multi-spark gap2 Nov 2023US 2023/0352916 A1Phoenix Contact GmbH & Co.KG
Most cited
By later US patents
- Arrester with graded capacitance varistors15US 4,276,578 AGeneral Electric Company · 1981
- Surge arrester9US 4,547,831 AASEA Aktiebolag · 1985
- Spark gap retrofit module for surge arrester9US 6,493,201 B1McGraw-Edison Company · 2002
- Enclosed lightning arrester5US 4,234,902 AMitsubishi Denki Kabushiki Kaisha · 1980
- Surge diverter4US 4,158,872 ASprecher & Schuh AG · 1979