US4264131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fiber of high durability prepared from multicomponent glass
Assignee: Toshiba Corp
•
Filing: 1979-05-08
•
Granted: 1981-04-28
•
Expires: 1999-05-08
Abstract
Abstract An optical fiber which consists of a multicomponent core glass member which is formed of SiO 2 , Al 2 O 3 and an alkali metal oxide and preferably contains CaO, MgO and B 2 O 3 ; and a multicomponent cladding glass member which is prepared from SiO 2 , Al 2 O 3 , an alkali metal oxide and at least one component selected from the group consisting of ZnO, ZrO 2 and TiO 2 , and preferably contains CaO, MgO and B 2 O 3 ; and consequently reduces transmission loss of light and exhibits prominent durability.
Inventors
- 👤 Kunihide Sawamura
- 👤 Mituo Kasori
- 👤 Takeshi Takano
- 👤 Hironori Maki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:09
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/045; C03C13/046; G; G02; G02B; G02B6/00; G02B6/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
An optical fiber consisting of a core glass member prepared from 55 to 70% by weight of SiO 2 , 1 to 6% by weight of Al 2 O 3 , 14 to 21% by weight of an alkali metal oxide, 2 to 8% by weight of CaO, 1 to 4% by weight of MgO and 3 to 12% by weight of B 2 O 3 ; and a cladding glass member formed of 65 to 75% by weight of SiO 2 , 2 to 8% by weight of Al 2 O 3 , 9 to 16% by weight of an alkali metal oxide, 0 to 5% by weight of CaO, 0 to 3% by weight of MgO, 1 to 12% by weight of B 2 O 3 , and 0.5 to 3% by weight of at least one component selected from the groupconsisting of ZnO, ZrO 2 and TiO 2 .
Claim 2
Dependent Claim
152 words
An optical fiber consisting of a core glass member prepared from 55 to 70% by weight of SiO 2 , 1 to 6% by weight of Al 2 O 3 , 14 to 21% by weight of an alkali metal oxide, 2 to 8% by weight of CaO, 1 to 4% by weight of MgO and 3 to 12% by weight of B 2 O 3 ; and a cladding glass member formed of 65 to 75% by weight of SiO 2 , 2 to 8% by weight of Al 2 O 3 , 9 to 16% by weight of an alkali metal oxide, 0 to 5% by weight of CaO, 0 to 3% by weight of MgO, 1 to 12% by weight of B 2 O 3 , and 0.5 to 3% by weight of at least one component selected from the groupconsisting of ZnO, ZrO 2 and TiO 2 .
Claim 3
Dependent Claim
29 words
The optical fiber according to claim 1, wherein part of SiO 2 in the core glass member is replaced by up to 30% by weight of GeO 2 .
Claim 4
Dependent Claim
33 words
The optical fiber according to claim 2, wherein the alkali metal oxide is at least one component selected from the group consisting of Na 2 O, K 2 O and Li 2 O.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |