H04B 3/26
Improving frequency characteristic by the use of loading coils
H04B3/26 (Improving frequency characteristic by the use of loading coils) appears on 20 US grants and 18 published applications in this corpus.
Search patents in H04B- Granted patents
- 20
- Published applications
- 18
- Assignees
- 19
- Inventors
- 51
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 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 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 1 |
| 2018 | 1 | 2 |
| 2019 | 2 | 3 |
| 2020 | 3 | 0 |
| 2021 | 1 | 3 |
| 2022 | 0 | 1 |
| 2023 | 0 | 2 |
| 2024 | 1 | 0 |
| 2025 | 2 | 0 |
By publication year. Applications have been published since 2001.
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Most cited
By later US patents
- Digital subscriber line induction neutralizing transformer network227US 7,266,154 B2Southwestern Bell Telephone Company · 2007
- Load coil device12US 6,546,100 B1Nortel Networks Limited · 2003
- Electronic loaded/nonloaded telephone loop identification circuit10US 4,224,483 ABell Telephone Laboratories, Incorporated · 1980
- Automatic telephone loaded/nonloaded facility type identification circuit5US 4,368,362 ABell Telephone Laboratories, Incorporated · 1983
- Magnetic shield system for electric cars4US 4,041,324 AHitachi, Ltd. · 1977