US4530569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fibers comprising cores clad with amorphous copolymers of perfluoro-2,2-dimethyl-1,3-dioxole
Assignee: EIDP Inc
•
Filing: 1984-03-20
•
Granted: 1985-07-23
•
Expires: 2004-03-20
Abstract
Abstract Amorphous copolymers of perfluoro-2,2-dimethyl-1,3-dioxole with tetrafluoroethylene and, optionally, with another ethylenically unsaturated monomer, have high glass transition temperatures, e.g., 85 DEG C. or higher, low indices of refraction, and good physical properties which make them suitable for cladding optical fibers.
Inventors
- 👤 Edward N. Squire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:21
CPC Classifications
C; C08; C08F; C08F234/00; C08F234/02; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/034; H05K3/00; H05K3/22; H05K3/28; H05K3/285
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
An optical fiber consisting of a core clad with an amorphous copolymer of perfluoro-2,2-dimethyl-1,3-dioxole with tetrafluoroethylene selected from the class consisting of dipolymers and of terpolymers containing in addition another ethylenically unsaturated monomer; the proportion of perfluoro-2,2-dimethyl-1,3-dioxole in the dipolymer being at least about 11 mole percent of the dipolymer; and the proportion of perfluoro-2,2-dimethyl-1,3-dioxole in the terpolymer being at least about 12 mole percent of the tetrafluoroethylene content, the mole proportion of the third monomer being the smallest of all three monomers.
Claim 2
Dependent Claim
83 words
An optical fiber consisting of a core clad with an amorphous copolymer of perfluoro-2,2-dimethyl-1,3-dioxole with tetrafluoroethylene selected from the class consisting of dipolymers and of terpolymers containing in addition another ethylenically unsaturated monomer; the proportion of perfluoro-2,2-dimethyl-1,3-dioxole in the dipolymer being at least about 11 mole percent of the dipolymer; and the proportion of perfluoro-2,2-dimethyl-1,3-dioxole in the terpolymer being at least about 12 mole percent of the tetrafluoroethylene content, the mole proportion of the third monomer being the smallest of all three monomers.
Claim 3
Dependent Claim
14 words
An optical fiber of claim 1 clad with a dipolymer of perfluoro-2,2-dimethyl-1,3-dioxole with tetrafluoroethylene.
Claim 4
Dependent Claim
14 words
An optical fiber of claim 1 in which the core is made of silica.
Claim 5
Dependent Claim
17 words
An optical fiber of claim 3 in which the cladding is a dipolymer of perfluoro-2,2-dimethyl-1,3-dioxole with tetrafluoroethylene.
References Cited (Backward Citations)
US2468664A
Cited
US3641332A
Cited
US3855897A
Cited
US3978030A
Cited
US3993834A
Cited
US3969285A
Cited
US3920980A
Cited
US4138194A
Cited
US4298245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |