C03B 2205/80
Means for sealing the preform entry or upper end of the furnace
C03B2205/80 (Means for sealing the preform entry or upper end of the furnace) appears on 64 US grants and 59 published applications in this corpus.
Search patents in C03B- Granted patents
- 64
- Published applications
- 59
- Assignees
- 33
- Inventors
- 133
- Latest grant
- 23 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 4 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 3 | 6 |
| 2003 | 1 | 1 |
| 2004 | 2 | 3 |
| 2005 | 1 | 1 |
| 2006 | 1 | 2 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 3 |
| 2010 | 2 | 2 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 3 | 1 |
| 2015 | 1 | 2 |
| 2016 | 1 | 2 |
| 2017 | 3 | 2 |
| 2018 | 0 | 2 |
| 2019 | 1 | 9 |
| 2020 | 4 | 5 |
| 2021 | 7 | 4 |
| 2022 | 6 | 5 |
| 2023 | 3 | 3 |
| 2024 | 0 | 0 |
| 2025 | 3 | 3 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Seal structure of wire drawing furnace for optical fiber, and production method for optical fiber23 Dec 2025US 12,503,387 B2Sumitomo Electric Industries, Ltd.
- Flexible sealing assembly for optical fiber draw furnace and optical fiber25 Nov 2025US 12,479,752 B2
- Apparatus for drying and/or consolidating a preform for optical fibres18 Mar 2025US 12,252,432 B2Prysmian S P A.
- Optical fiber draw furnace system and method21 Nov 2023US 11,820,696 B2Corning Incorporated
- Furnace gas feeding device, optical fiber production device, and optical fiber production method24 Oct 2023US 11,795,099 B2Sumitomo Electric Industries, Ltd.
- Apparatus for drying and/or consolidating a preform for optical fibres20 Mar 2025US 2025/0091933 A1Prysmian S P A.
- Microgravity crucible-controlled manufacturing13 Mar 2025US 2025/0083990 A1DSTAR Communications, Inc.
- High pressure draw furnace and methods of producing optical fibers23 Jan 2025US 2025/0026675 A1Corning Incorporated
- Apparatus for drying and/or consolidating a preform for optical fibres30 Nov 2023US 2023/0382781 A1Prysmian S P A.
- Flexible sealing assembly for optical fiber draw furnace and optical fiber21 Sep 2023US 2023/0295033 A1
Most cited
By later US patents
- Method for drawing fibers44US 4,030,901 ABell Telephone Laboratories, Incorporated · 1977
- Methods of and apparatus for heating a preform from which lightguide fiber is drawn41US 4,383,843 AWestern Electric Company, Inc. · 1983
- Method of and device for drawing an optical fiber from a solid preform consisting substantially of SiO.sub.2 and doped SiO.sub.238US 4,673,427 AU. S. Philips Corporation · 1987
- Method of drawing optical filaments33US 4,154,592 ACorning Glass Works · 1979
- Method for producing optical fiber in a hydrogen atmosphere to prevent attenuation27US 5,059,229 ACorning Incorporated · 1991