G02B 6/29383
Adding and dropping
Official title: {Adding and dropping}
G02B6/29383 (Adding and dropping) appears on 383 US grants and 305 published applications in this corpus.
Search patents in G02B- Granted patents
- 383
- Published applications
- 305
- Assignees
- 192
- Inventors
- 709
- Latest grant
- 6 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 3 | 0 |
| 1998 | 17 | 0 |
| 1999 | 11 | 0 |
| 2000 | 14 | 0 |
| 2001 | 30 | 14 |
| 2002 | 27 | 77 |
| 2003 | 38 | 38 |
| 2004 | 37 | 38 |
| 2005 | 32 | 19 |
| 2006 | 24 | 21 |
| 2007 | 30 | 12 |
| 2008 | 24 | 8 |
| 2009 | 9 | 9 |
| 2010 | 10 | 8 |
| 2011 | 6 | 3 |
| 2012 | 6 | 2 |
| 2013 | 3 | 4 |
| 2014 | 7 | 3 |
| 2015 | 7 | 2 |
| 2016 | 5 | 7 |
| 2017 | 4 | 4 |
| 2018 | 5 | 4 |
| 2019 | 4 | 3 |
| 2020 | 8 | 9 |
| 2021 | 5 | 5 |
| 2022 | 6 | 3 |
| 2023 | 2 | 3 |
| 2024 | 4 | 1 |
| 2025 | 1 | 5 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and methods for gas spectroscopic sensing with photon counting and tunable integrated photonic filters6 Jan 2026US 12,517,039 B2The Trustees of the Stevens Institute of Technology
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- Optical switching method and apparatus, liquid crystal on silicon, and wavelength selective switch3 Sep 2024US 12,081,320 B2Huawei Technologies Co., Ltd.
- Optical switching apparatus, redirection method, reconfigurable optical add/drop multiplexer, and system20 Aug 2024US 12,068,842 B2Huawei Technologies Co., Ltd.
- Optical branching/coupling device and optical branching/coupling method27 Feb 2024US 11,914,191 B2NEC Corporation
- Optical network component configuration27 Aug 2026US 2026/0254550 A1Telefonaktiebolaget LM Ericsson (publ)
- Interlocked n-by-n wavelength selective switch19 Feb 2026US 2026/0050125 A1II-Vi Delaware, Inc.
- Multi-ring resonator shared bus structures for optical communications8 Jan 2026US 2026/0009950 A1InfiniLink Inc.
- Optical switch with ring resonator photonic devices18 Sep 2025US 2025/0291116 A1
- Optical switch with ring resonator photonic devices18 Sep 2025US 2025/0291117 A1
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
- Alternating sequential half duplex communication system218US 4,979,170 AQUALCOMM Incorporated · 1990
- Modular all-optical cross-connect126US 6,614,953 B2Photuris, Inc. · 2003
- Optical add-drop multiplexers for WDM optical communication systems125US 5,778,118 ACiena Corporation · 1998
- Optical routing element for use in fiber optic systems121US 6,356,679 B1K2 Optronics, Inc. · 2002