US4552434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline infrared optical fiber with a small gap and a process for the production of same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1983-03-11
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Granted: 1985-11-12
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Expires: 2003-03-11
Abstract
Abstract An infrared fiber is obtained in which a core crystal fiber for transmitting infrared rays is inserted in a cladding crystal pipe having a smaller refractive index than the core crystal fiber and in which the interface between the core and pipe is held smooth. This infrared fiber can effectively be prepared by inserting a core crystal fiber in a cladding crystal pipe and then subjecting the inserted pipe to a drawing working through a die.
Inventors
- 👤 Kazuhito Murakami
- 👤 Kenichi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:29
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/102; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; C; C03; C03C; C03C13/00; C03C13/008; C30; C30B; C30B29/00; C30B29/10; C30B29/12; C30B29/60; C30B29/62; C30B33/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
A crystalline fiber, which comprises a core crystal fiber for transmitting infrared rays provided in a cladding crystal pipe having a smaller refractive index than the core crystal fiber with a gap of 0.01 to 0.1 mm between the core crystal fiber and the cladding crystal pipe, the core crystal fiber and the cladding crystal pipe being crystalline materials selected from the group consisting of thallium halides, silver halides, alkali metal halides and mixed crystals thereof in such a combination as to give a larger refractive index to the core crystal fiber than the cladding crystal pipe.
Claim 2
Dependent Claim
97 words
A crystalline fiber, which comprises a core crystal fiber for transmitting infrared rays provided in a cladding crystal pipe having a smaller refractive index than the core crystal fiber with a gap of 0.01 to 0.1 mm between the core crystal fiber and the cladding crystal pipe, the core crystal fiber and the cladding crystal pipe being crystalline materials selected from the group consisting of thallium halides, silver halides, alkali metal halides and mixed crystals thereof in such a combination as to give a larger refractive index to the core crystal fiber than the cladding crystal pipe.
Claim 3
Dependent Claim
27 words
The crystalline fiber of claim 1, wherein the outer circumference of the cladding crystal pipe is coated with a protective layer of a resin or a metal.
Claim 4
Dependent Claim
24 words
The crystalline fiber of claim 1, wherein the cladding crystal pipe is obtained by extruding a single crystal or polycrystal through a combination die.
Claim 5
Dependent Claim
64 words
A process for the production of a crystalline fiber, which comprises inserting a core crystal fiber in a cladding crystal pipe, and subjecting the fiber and pipe to drawing through a die to thereby coat the core crystal fiber with the cladding crystal pipe such that a gap of 0.01 to 0.1 mm exists between the core crystal fiber and the cladding crystal pipe.
Claim 6
Dependent Claim
64 words
A process for the production of a crystalline fiber, which comprises inserting a core crystal fiber in a cladding crystal pipe, and subjecting the fiber and pipe to drawing through a die to thereby coat the core crystal fiber with the cladding crystal pipe such that a gap of 0.01 to 0.1 mm exists between the core crystal fiber and the cladding crystal pipe.
Claim 7
Dependent Claim
56 words
The process of claim 4, wherein the core crystal fiber and the cladding crystal pipe are crystalline materials selected from the group consisting of thallium halides, silver halides, alkali metal halides and mixed crystals thereof in such a combination as to give a larger refractive index to the core crystal fiber than the cladding crystal pipe.
Claim 8
Dependent Claim
27 words
The process of claim 4, wherein the cladding crystal pipe is obtained by extruding a single crystal or polycrystal of a metal halide through a combination die.
Claim 9
Dependent Claim
19 words
The process of claim 4, wherein the drawing is carried out with an area reduction of at most 20%.
Claim 10
Dependent Claim
16 words
The process of claim 4, wherein the drawing is carried out by aid of a lubricant.
Claim 11
Dependent Claim
19 words
The process of claim 4, wherein the drawing is carried out at a temperature of 100° to 380° C.
Claim 12
Dependent Claim
50 words
A process for the production of a crystalline fiber, which comprises preparing a cladding crystal pipe by extrusion and simultaneously inserting a core crystal fiber in the cladding crystal pipe such that a gap of 0.01 to 0.1 mm exists between the core crystal fiber and the cladding crystal pipe.
Claim 13
Dependent Claim
50 words
A process for the production of a crystalline fiber, which comprises preparing a cladding crystal pipe by extrusion and simultaneously inserting a core crystal fiber in the cladding crystal pipe such that a gap of 0.01 to 0.1 mm exists between the core crystal fiber and the cladding crystal pipe.
Claim 14
Dependent Claim
56 words
The process of claim 10, wherein the core crystal fiber and the cladding crystal pipe are crystalline materials selected from the group consisting of thallium halides, silver halides, alkali metal halides and mixed crystals thereof in such a combination as to give a larger refractive index to the core crystal fiber than the cladding crystal pipe.
Claim 15
Dependent Claim
70 words
The process of claim 10, wherein the extrusion is carried out by the use of a combination die consisting of a die and a porthole with a hole for the passage of the core crystal fiber and a guide of hollow protective shaft and an extrusion ram with a hole for the passage of the core crystal fiber, the combination die and extrusion ram being provided in an extrusion container.
Claim 16
Dependent Claim
19 words
The process of claim 10, wherein the extrusion is carried out at a temperature of 100° to 380° C.
Claim 17
Dependent Claim
15 words
The process of claim 10, wherein the core crystal fiber is previously prepared by extrusion.
References Cited (Backward Citations)
US3253896A
Cited
US3227032A
Cited
US4165915A
Cited
US4039607A
Cited
JPS53145645A
Cited
US4451116A
Cited
JPS54143242A
Cited
US4326869A
Cited
US4253731A
Cited
US4375314A
Cited
US4381141A
Cited
US4480898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |