US4183620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint doped porous glass article with high modifier concentrations
Assignee: Individual
•
Filing: 1976-12-30
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Granted: 1980-01-15
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Expires: 1996-12-30
Abstract
Abstract A glass composition having at least 85 mole percent of SiO2, where the improvement comprises at least 7 wt percent of at least one member selected from the group consisting of PbO and Bi2O3 and at least 1.5 mole percent of at least one member selected from the group consisting of K2O, Rb2O and Cs2O.
Inventors
- 👤 Pedro B. Macedo
- 👤 Mrinmay Samanta
- 👤 Joseph H. Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:06
CPC Classifications
C; C03; C03C; C03C23/00; C03C23/0095; C03C11/00; C03C13/00; C03C13/001; C03C3/00; C03C3/04; C03C3/06; C03C3/076; C03C3/102; C03C2201/00; C03C2201/06; C03C2201/08; C03C2201/10; C03C2201/30; C03C2201/50; G; G02; G02B; G02B6/00; G02B6/02; G02B6/028; G02B6/0281
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
A glass article having a center and a surface, said article having a composition comprising at least 85 mole percent of SiO 2 , from 7 to 25 weight percent of at least one dopant member selected from the group (I) consisting of PbO and Bi 2 O 3 and from 1.5 to 9 mole percent of at least one dopant member selected from the group (II) consisting of K 2 O, Rb 2 O and Cs 2 O in said center and decreasing amounts of said dopant members of groups (I) and (II) away from said center and an increasing SiO 2 concentration away from said center as said surface is approached.
Claim 2
Dependent Claim
113 words
A glass article having a center and a surface, said article having a composition comprising at least 85 mole percent of SiO 2 , from 7 to 25 weight percent of at least one dopant member selected from the group (I) consisting of PbO and Bi 2 O 3 and from 1.5 to 9 mole percent of at least one dopant member selected from the group (II) consisting of K 2 O, Rb 2 O and Cs 2 O in said center and decreasing amounts of said dopant members of groups (I) and (II) away from said center and an increasing SiO 2 concentration away from said center as said surface is approached.
Claim 3
Dependent Claim
37 words
The glass article of claim 1 wherein said composition comprises from 7 to 20 weight percent of said dopant member of group (I) and from 1.5 to 7 mole percent of said dopant member of group (II).
Claim 4
Dependent Claim
21 words
The glass article of claim 1 wherein said composition further comprises at least 2 mole percent B 2 O 3 .
Claim 5
Dependent Claim
22 words
The glass article of claim 1 wherein said composition further comprises from 2 to 9.5 mole percent B 2 O 3 .
Claim 6
Dependent Claim
17 words
The glass article of claim 1 wherein said dopant member of group (II) is Cs 2 O.
Claim 7
Dependent Claim
17 words
The glass article of claim 1 wherein said dopant member of group (II) is Rb 2 O.
Claim 8
Dependent Claim
13 words
The glass article of claim 1 wherein said article is an optical waveguide.
Claim 9
Dependent Claim
14 words
The glass article of claim 1 wherein said article is an optical waveguide fiber.
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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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |