US5474589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
UV light-permeable glass and article comprising the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1994-04-12
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Granted: 1995-12-12
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Expires: 2014-04-12
Abstract
Abstract A UV light-permeable optical glass consisting of a fluorine-doped synthetic quartz glass, which has a long term reliability.
Inventors
- 👤 Yuichi Ohga
- 👤 Shinji Ishikawa
- 👤 Tatsuhiko Saito
- 👤 Hiroshi Yokota
- 👤 Michihisa Kyoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:45
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/0085; C03B; C03B19/00; C03B19/12; C03C3/00; C03C3/04; C03C3/06; G; G02; G02B; G02B6/00; G02B6/02; C03B2201/00; C03B2201/06; C03B2201/08; C03B2201/12; C03C2201/00; C03C2201/06; C03C2201/08; C03C2201/12; C03C2203/00; C03C2203/40; C03C2203/42; C03C2203/44; C03C2203/50; C03C2203/52; C03C2203/54; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A method of making an optical glass permeable to UV light having a wave length of 155 nm to 400 nm comprising a fluorine-doped synthetic quartz glass having a composition of SiO 1 .5 F in which a content of fluorine is about 1.5 to 3.0 percent by weight and which contains E' center defects in a decreased concentration, comprising the steps of: reacting fluorine or a fluorine containing dopant with a porous quartz mass or a soot mass of quartz glass under conditions such that the resulting synthetic quartz glass has a composition of SiO 1 .5 F and a content of fluorine of about 1.5 to 3.0 percent by weight.
Claim 2
Independent Claim
112 words
A method of making an optical glass permeable to UV light having a wave length of 155 nm to 400 nm comprising a fluorine-doped synthetic quartz glass having a composition of SiO 1 .5 F in which a content of fluorine is about 1.5 to 3.0 percent by weight and which contains E' center defects in a decreased concentration, comprising the steps of: reacting fluorine or a fluorine containing dopant with a porous quartz mass or a soot mass of quartz glass under conditions such that the resulting synthetic quartz glass has a composition of SiO 1 .5 F and a content of fluorine of about 1.5 to 3.0 percent by weight.
Claim 3
Dependent Claim
42 words
The method according to claim 1, further comprising the steps of reacting said porous quartz mass or soot mass with chlorine or a chlorine containing dopant before reacting said porous quartz mass or soot mass with said fluorine or fluorine containing dopant.
Claim 4
Dependent Claim
41 words
The method according to claim 2, wherein said fluorine containing dopant is selected from the group consisting of SiF 4 , CF 4 , F 2 , SF 6 , C 3 F 8 , and CCl 2 F 2 .
Claim 5
Dependent Claim
51 words
The method according to claim 1, wherein an amount of said dopant is determined by the following formula: n=α(C).sup.1/4 wherein n is the amount of decrease of specific refractive index in %, C is the concentration of the dopant in the reaction system in partial pressure, and α is a constant.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |