H01P 1/39
Hollow waveguide circulators
H01P1/39 (Hollow waveguide circulators) appears on 85 US grants and 67 published applications in this corpus.
Search patents in H01P- Granted patents
- 85
- Published applications
- 67
- Assignees
- 44
- Inventors
- 108
- Latest grant
- 5 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 2 |
| 2004 | 1 | 0 |
| 2005 | 1 | 3 |
| 2006 | 1 | 3 |
| 2007 | 5 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 1 |
| 2010 | 2 | 2 |
| 2011 | 0 | 0 |
| 2012 | 2 | 3 |
| 2013 | 1 | 1 |
| 2014 | 5 | 9 |
| 2015 | 8 | 8 |
| 2016 | 11 | 12 |
| 2017 | 6 | 1 |
| 2018 | 3 | 8 |
| 2019 | 4 | 4 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 1 | 1 |
| 2023 | 0 | 4 |
| 2024 | 1 | 2 |
| 2025 | 4 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Radiofrequency source having a phase stabilization element5 Aug 2025US 12,382,572 B2Siemens Healthineers AG
- Broadband junction ferrite circulator3 Jun 2025US 12,322,848 B2Millimeter Wave Systems, LLC
- Gapless ferrite structure for circulator or isolator22 Apr 2025US 12,283,735 B2Universal Microwave Technology, Inc.
- Microwave heating device with reflection protection21 Jan 2025US 12,207,379 B2Sichuan University
- Circular filter assembly16 Apr 2024US 11,962,058 B1Chengdu Lingyi Communication Technology Co., Ltd.
- Four-port circulator16 Apr 2026US 2026/0106363 A1Sichuan University
- Gapless ferrite structure for circulator or isolator30 May 2024US 2024/0177905 A1Universal Microwave Technology, Inc.
- Circular filter assembly2 May 2024US 2024/0145895 A1Chengdu Lingyi Communication Technology Co., Ltd.
- Broadband junction ferrite circulator28 Dec 2023US 2023/0420820 A1Millimeter Wave Systems, LLC
- Compact High Power Radio Frequency Polarizer Group19 Oct 2023US 2023/0335878 A1TibaRay, Inc.
Most cited
By later US patents
- Structure comprising at least a first element bonded to a carrier having a closed metallic channel waveguide formed therein206US 10,276,909 B2Invensas Bonding Technologies, Inc. · 2019
- Multi-junction waveguide circulator without internal transitions31US 6,885,257 B2EMS Technologies, Inc. · 2005
- Reduced height waveguide circulator25US 4,697,158 AElectromagnetic Sciences, Inc. · 1987
- Multi-junction waveguide circulator with overlapping quarter-wave transformers19US 7,561,003 B2EMS Technologies, Inc. · 2009
- Waveguide circulator18US 4,058,780 AMicrowave Development Labs. Inc. · 1977