G02B 6/29362
Serial cascade of filters or filtering operations
Official title: {Serial cascade of filters or filtering operations, e.g. for a large number of channels}
G02B6/29362 (Serial cascade of filters or filtering operations) appears on 590 US grants and 560 published applications in this corpus.
Search patents in G02B- Granted patents
- 590
- Published applications
- 560
- Assignees
- 282
- Inventors
- 1,271
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 5 | 0 |
| 1998 | 9 | 0 |
| 1999 | 12 | 0 |
| 2000 | 8 | 0 |
| 2001 | 18 | 7 |
| 2002 | 25 | 51 |
| 2003 | 30 | 49 |
| 2004 | 46 | 39 |
| 2005 | 30 | 25 |
| 2006 | 20 | 18 |
| 2007 | 21 | 12 |
| 2008 | 18 | 19 |
| 2009 | 13 | 9 |
| 2010 | 11 | 11 |
| 2011 | 8 | 12 |
| 2012 | 9 | 7 |
| 2013 | 10 | 14 |
| 2014 | 6 | 12 |
| 2015 | 17 | 15 |
| 2016 | 17 | 21 |
| 2017 | 28 | 41 |
| 2018 | 35 | 33 |
| 2019 | 28 | 22 |
| 2020 | 32 | 29 |
| 2021 | 23 | 23 |
| 2022 | 19 | 19 |
| 2023 | 16 | 24 |
| 2024 | 18 | 23 |
| 2025 | 14 | 16 |
| 2026 | 8 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Bi-directional and multi-channel optical module with single cavity accommodating both optical transmitter and receiver assemblies11 Aug 2026US 12,706,676 B2Global Technology Inc.
- Wavelength-division multiplexing device and communications device7 Jul 2026US 12,674,936 B2Huawei Technologies Co., Ltd.
- Red green blue laser module16 Jun 2026US 12,658,676 B2KYOCERA SLD Laser, Inc.
- Optical module having electrically-connected substrate10 Mar 2026US 12,571,969 B2Hisense Broadband Multimedia Technologies Co., Ltd.
- Optic multiplexer or demultiplexer17 Feb 2026US 12,554,081 B2Cisco Technology, Inc.
- A Compact Optical Multiplexer - Demultiplexer System13 Aug 2026US 2026/0238375 A1Optimal Coatech (Guangzhou) Co., Ltd.
- Optical receiver and optical module with multiple wavelength tunable filters25 Jun 2026US 2026/0177847 A1Phovel. Co. Ltd
- Lens-type total reflection wavelength division multiplexing passive element structure18 Jun 2026US 2026/0169225 A1Foci Fiber Optic Communications, Inc.
- Optic multiplexer or demultiplexer21 May 2026US 2026/0140335 A1Cisco Technology, Inc.
- Optical communication device14 May 2026US 2026/0133385 A1FUJIFILM Corporation
Most cited
By later US patents
- High reflection isolation optical devices and the method for making the same357US 7,289,733 B1Alliance Fiber Optic Products, Inc. · 2007
- Optical multiplexing device186US 5,583,683 AOptical Corporation of America · 1996
- Optical multiplexer and demultiplexer151US 4,244,045 ANippon Telegraph & Telephone Public Corporation · 1981
- Modular all-optical cross-connect126US 6,614,953 B2Photuris, Inc. · 2003
- Optical branching device with internal waveguide120US 4,693,544 ANippon Sheet Glass Co., Ltd. · 1987