Patent US4452623A successfully refreshed from Google Patents.
US4452623A
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Method for producing optical multiple fiber
Assignee: Mitsubishi Cable Industries Ltd
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Filing: 1981-08-24
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Granted: 1984-06-05
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Expires: 2001-08-24
Abstract
Abstract A method for producing an optical multiple fiber, which comprises bundling a multiplicity of silica glass light-conducting elements and drawing the bundle of the light-conducting elements in the state that a liquid intermediary material (comprising at least one member selected from the group consisting of glass forming oxides, glass modifying oxides and intermediate oxides) exists among the elements; thereby providing a multiple fiber excellent in image-transmitting capacity and image-resolving power, by fusing together a multiplicity of silica glass light-conducting elements with each other in drawing to prevent the occurrence of bubbles.
Inventors
- 👤 Atsushi Utsumi
- 👤 Masaharu Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:20
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/01205; C03B37/01211; C03B37/01214; C03B37/02; C03B37/025; C03B37/027; C03B2203/00; C03B2203/40
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
124 words
A method for producing an optical multiple fiber which comprises bundling a multiplicity of silica glass light-conducting elements and drawing the bundle of the light-conducting elements in the state that an intermediary material exists in the molten state among the elements; said intermediary material comprising at least one member selected from the group consisting of glass forming oxides, glass modifying oxides and intermediate oxides, provided that the use of SiO 2 alone as the intermediary material is excluded; and said intermediary material being formed on the surfaces of the previously bundled light-conducting elements, before carrying out the drawing of the bundle, by passing a precursor gas of the intermediary material through the interstices between the elements of the bundle maintained at a high temperature.
Claim 2
Independent Claim
124 words
A method for producing an optical multiple fiber which comprises bundling a multiplicity of silica glass light-conducting elements and drawing the bundle of the light-conducting elements in the state that an intermediary material exists in the molten state among the elements; said intermediary material comprising at least one member selected from the group consisting of glass forming oxides, glass modifying oxides and intermediate oxides, provided that the use of SiO 2 alone as the intermediary material is excluded; and said intermediary material being formed on the surfaces of the previously bundled light-conducting elements, before carrying out the drawing of the bundle, by passing a precursor gas of the intermediary material through the interstices between the elements of the bundle maintained at a high temperature.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein each of the light-conducting elements is a single optical fiber.
Claim 4
Dependent Claim
15 words
The method of claim 1, wherein each of the light-conducting elements is a multiple fiber.
Claim 5
Dependent Claim
35 words
The method of claim 1, wherein the intermediary material is at least one oxide of an element selected from the group consisting of elements of Groups II, III, IV and V of the Periodic Table.
Claim 6
Dependent Claim
34 words
The method of claim 4, wherein the intermediary material is at least one oxide of an element selected from the group consisting of B, P, Ge, Sb, Bi, Sn, Tl, Ti, Cd and Pb.
Claim 7
Dependent Claim
42 words
The method of claim 4, wherein the intermediary material is a mixture of SiO 2 and at least one oxide of an element selected from the group consisting of B, P, Ge, Sb, Bi, Sn, Tl, Ti, Cd, Pb, Al and Ba.
Claim 8
Independent Claim
29 words
The method of any one of claims 4, 5 or 6, wherein the intermediary material has a viscosity of 10 -2 to 10 3 poises at the drawing temperature.
Claim 9
Independent Claim
20 words
The method of any one of claims 1, 4, 5 or 6, wherein the intermediary material contains a light-absorbing material.
Claim 10
Dependent Claim
16 words
The method of claim 1, wherein the precursor gas is passed together with a carrier gas.
Claim 11
Dependent Claim
33 words
The method of claim 9, wherein the precursor gas is a gas of a halide of an element which constitutes the intermediary material to be produced, and the carrier gas is oxygen gas.
Claim 12
Independent Claim
71 words
The method of any one of claims 1, 2 or 3, wherein the intermediary material is formed on the surfaces of the light-conducting elements in layers which consist of an inner layer of an intermediary material having a low melt viscosity of not more than 10 2 poises at a drawing temperature and a layer formed on the inner layer and made of a mixed intermediary material containing SiO 2 .
Claim 13
Dependent Claim
35 words
The method of claim 9, wherein the precursor gas is passed together with the carrier gas through the interstices between the light-conducting elements of the bundle maintained at a temperature of 500° to 1,500° C.
Claim 14
Dependent Claim
30 words
The method of claim 1, wherein the precursor gas is passed through the interstices between the light-conducting elements of the bundle maintained at a temperature of 500° to 1,500° C.
Claim 15
Dependent Claim
14 words
The method of claim 1, wherein the precursor gas is a halide of boron.
Claim 16
Independent Claim
103 words
A method for producing an optical multiple fiber which comprises: bundling a multiplicity of fibers of silica glass light-conducting elements, forming an intermediary material on the surfaces of the light-conducting elements of the resulting bundle, by passing a precursor gas of the intermediary material through the interstices between the elements of the bundle while maintaining the bundle at a high temperature; said intermediary material comprising at least one of glass forming oxide, glass modifying oxide and intermediate oxides, but not including SiO 2 alone, and drawing the bundle of the elements while maintaining the intermediary material in a molten state among the elements.
Claim 17
Independent Claim
103 words
A method for producing an optical multiple fiber which comprises: bundling a multiplicity of fibers of silica glass light-conducting elements, forming an intermediary material on the surfaces of the light-conducting elements of the resulting bundle, by passing a precursor gas of the intermediary material through the interstices between the elements of the bundle while maintaining the bundle at a high temperature; said intermediary material comprising at least one of glass forming oxide, glass modifying oxide and intermediate oxides, but not including SiO 2 alone, and drawing the bundle of the elements while maintaining the intermediary material in a molten state among the elements.
Claim 18
Dependent Claim
21 words
The method of claim 15, wherein the precursor gas alone is passed through the interstices between the elements of the bundle.
Claim 19
Dependent Claim
15 words
The method of claim 1 or 15 wherein the precursor is a fluoride of boron.
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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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |