H01P 1/211
Waffle-iron filters
Official title: Waffle-iron filters; Corrugated structures
H01P1/211 (Waffle-iron filters) appears on 51 US grants and 44 published applications in this corpus.
Search patents in H01P- Granted patents
- 51
- Published applications
- 44
- Assignees
- 45
- Inventors
- 124
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 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 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 1 | 1 |
| 2003 | 2 | 1 |
| 2004 | 2 | 1 |
| 2005 | 2 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 4 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 2 |
| 2015 | 1 | 1 |
| 2016 | 1 | 0 |
| 2017 | 2 | 2 |
| 2018 | 2 | 4 |
| 2019 | 4 | 2 |
| 2020 | 1 | 4 |
| 2021 | 2 | 5 |
| 2022 | 6 | 7 |
| 2023 | 2 | 3 |
| 2024 | 4 | 1 |
| 2025 | 3 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Microwave or millimeter wave passive components or devices16 Jun 2026US 12,658,545 B2Ecole Polytechnique Federale De Lausanne (Epfl)
- Corrugated passive radiofrequency device suitable for an additive manufacturing method9 Dec 2025US 12,494,585 B2Swissto12 SA
- RF source protection9 Sep 2025US 12,414,221 B2Elekta Limited
- Waffle iron filter arrangement for high-frequency signals1 Jul 2025US 12,347,913 B2Tesat-Spacecom GmbH & Co. KG
- Waveguide filters10 Dec 2024US 12,166,257 B2Telefonaktiebolaget LM Ericsson (publ)
- Array antenna and electromagnetic wave device1 Jan 2026US 2026/0005446 A1Taiyo Yuden Co., Ltd.
- Corrugated passive radiofrequency device suitable for an additive manufacturing method6 Jun 2024US 2024/0186709 A1Swissto12 SA
- Waffle Iron Filter Arrangement For High-Frequency Signals7 Dec 2023US 2023/0395961 A1Tesat-Spacecom GmbH & Co. KG
- Rf source protection23 Nov 2023US 2023/0380049 A1Elekta Limited
- Microwave or millimeter wave passive components or devices13 Apr 2023US 2023/0109939 A1Ecole Polytechnique Federale De Lausanne (Epfl)
Most cited
By later US patents
- Waveguide and method of manufacture90US 7,280,011 B2Intel Corporation · 2007
- Embedded ridge waveguide filters54US 6,535,083 B1Northrop Grumman Corporation · 2003
- Molded waveguide filter with integral tuning posts32US 3,955,161 AGeneral Dynamics Corporation · 1976
- Waveguide device, and antenna device including the waveguide device30US 10,158,158 B2Nidec Corporation · 2018
- Transverse-electric mode filters and methods30US 6,118,978 AHughes Electronics Corporation · 2000