C03B 2201/50
Doped with alkali metals
Official title: doped with alkali metals
C03B2201/50 (Doped with alkali metals) appears on 143 US grants and 135 published applications in this corpus.
Search patents in C03B- Granted patents
- 143
- Published applications
- 135
- Assignees
- 55
- Inventors
- 303
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 6 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 0 | 0 |
| 1989 | 4 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 6 | 5 |
| 2003 | 2 | 12 |
| 2004 | 5 | 2 |
| 2005 | 5 | 8 |
| 2006 | 5 | 3 |
| 2007 | 2 | 3 |
| 2008 | 2 | 3 |
| 2009 | 3 | 0 |
| 2010 | 1 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 8 |
| 2013 | 1 | 5 |
| 2014 | 5 | 3 |
| 2015 | 4 | 12 |
| 2016 | 9 | 10 |
| 2017 | 8 | 7 |
| 2018 | 6 | 7 |
| 2019 | 2 | 6 |
| 2020 | 5 | 6 |
| 2021 | 5 | 3 |
| 2022 | 3 | 1 |
| 2023 | 4 | 11 |
| 2024 | 0 | 6 |
| 2025 | 6 | 7 |
| 2026 | 1 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Optical fiber manufacturing method and apparatus10 Mar 2026US 12,570,566 B2Furukawa Electric Co., Ltd.
- Multicore fiber, manufacturing method for multicore fiber, multicore fiber preform, and manufacturing method for multicore fiber preform25 Nov 2025US 12,481,097 B2Furukawa Electric Co., Ltd.
- Production method for optical fiber base material, and optical fiber base material11 Nov 2025US 12,466,757 B2Sumitomo Electric Industries, Ltd.
- Method for producing optical fiber base material, and optical fiber base material26 Aug 2025US 12,398,062 B2Sumitomo Electric Industries, Ltd.
- Quartz glass crucible and manufacturing method thereof29 Jul 2025US 12,371,812 B2Sumco Corporation
- Methods of recycling cullet and fibreglass17 Sep 2026US 2026/0274733 A1Sibelco Nederland N.V.
- Reservoir, method for producing optical fiber, and device for producing optical fiber18 Jun 2026US 2026/0167553 A1Sumitomo Electric Industries, Ltd.
- Multicore optical fiber4 Jun 2026US 2026/0153668 A1Sumitomo Electric Industries, Ltd.
- Method for producing optical fiber preform, and optical fiber preform26 Mar 2026US 2026/0084997 A1Sumitomo Electric Industries, Ltd.
- Optical fiber with reduced attenuation due to reduced absorption contribution5 Mar 2026US 2026/0063835 A1Corning Incorporated
Most cited
By later US patents
- Method of making fused silica by decomposing siloxanes106US 5,043,002 ACorning Incorporated · 1991
- Method of making fused silica70US 5,152,819 ACorning Incorporated · 1992
- Method of producing optical wave guide fibers67US 3,938,974 A1976
- High index-contrast fiber waveguides and applications61US 6,788,864 B2OmniGuide Communications · 2004
- Drying control chemical additives for rapid production of large sol-gel derived silicon, boron and sodium containing monoliths50US 4,851,150 AUniversity of Florida · 1989