C03B 2201/03
Impurity concentration specified
C03B2201/03 (Impurity concentration specified) appears on 127 US grants and 155 published applications in this corpus.
Search patents in C03B- Granted patents
- 127
- Published applications
- 155
- Assignees
- 70
- Inventors
- 416
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 7 | 3 |
| 2003 | 4 | 9 |
| 2004 | 3 | 13 |
| 2005 | 4 | 16 |
| 2006 | 6 | 16 |
| 2007 | 2 | 5 |
| 2008 | 4 | 9 |
| 2009 | 7 | 4 |
| 2010 | 4 | 10 |
| 2011 | 8 | 3 |
| 2012 | 9 | 8 |
| 2013 | 6 | 4 |
| 2014 | 3 | 6 |
| 2015 | 2 | 5 |
| 2016 | 5 | 5 |
| 2017 | 3 | 1 |
| 2018 | 2 | 3 |
| 2019 | 2 | 11 |
| 2020 | 3 | 4 |
| 2021 | 2 | 4 |
| 2022 | 5 | 6 |
| 2023 | 4 | 1 |
| 2024 | 5 | 4 |
| 2025 | 1 | 5 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Large-sized hollow porous quartz glass preform and method of manufacturing the same28 Jul 2026US 12,692,184 B2Shin-Etsu Quartz Products Co., Ltd.
- Preform for optical fiber with low chlorine concentration improvements relating to loss and its use, method of its production and use thereof15 Apr 2025US 12,276,829 B2Nkt Photonics A/S
- Apparatus and method for manufacturing silica glass crucible17 Sep 2024US 12,091,346 B2Sumco Corporation
- Glass fiber and method for producing the same23 Jul 2024US 12,043,566 B2Nippon Sheet Glass Co., Ltd.
- Quartz glass with low content of hydroxyl and high purity and method for preparing the same14 May 2024US 11,981,594 B2Jiangsu Zhongtian Technology Co., Ltd.
- Silica glass porous body and manufacturing method therefor25 Dec 2025US 2025/0388508 A1AGC Inc.
- Manufacturing method of optical fiber preform, optical fiber preform, and optical fiber3 Jul 2025US 2025/0214880 A1Shin-Etsu Chemical Co., Ltd.
- Optical fiber with low chlorine concentration improvements relating to loss and its use, method of its production and use thereof26 Jun 2025US 2025/0208338 A1Nkt Photonics A/S
- Tubular composite body of quartz glass and method for producing and using the same13 Feb 2025US 2025/0051211 A1Heraeus Quarzglas GmbH & Co.KG
- Optical Fiber Drawing Apparatus and Method Thereof2 Jan 2025US 2025/0002391 A1
Most cited
By later US patents
- Method of producing an optical fiber preform from a plurality of tubes having different thermal conductivities44US 5,702,497 ASamsung Electronics Co., Ltd. · 1997
- Method of making a fiber having low loss at 1385 nm by cladding a VAD preform with a D/d<7.537US 6,131,415 ALucent Technologies Inc. · 2000
- Method of manufacturing a monomode optical fiber36US 5,106,402 AU. S. Philips Corporation · 1992
- Manufacture of quartz glass crucible for use in the manufacture of single crystal silicon36US 5,174,801 AShin-Etsu Quartz Products Co., Ltd. · 1992
- Method of making a large MCVD single mode fiber preform by varying internal pressure to control preform straightness33US 6,105,396 ALucent Technologies Inc. · 2000