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US5031996A
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US
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Optical transmission element
Assignee: Siemens AG
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Filing: 1990-03-29
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Granted: 1991-07-16
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Expires: 2010-03-29
Abstract
Abstract An optical transmission element that has an oil-containing filling compound and inside is provided with a two-layer outside sheath. The inside layer of the sheath is composed of a polyolefin and the outside layer is composed of a polyester, particularly of a polycarbonate. The shrinkage and swelling of the inside layer is largely compensated by the hard outside layer and the swelling portion, which usually appear at higher temperature, are kept extremely low.
Inventors
- 👤 Helmut Saller
- 👤 Guenther Weber
- 👤 Gisela Ettenberger
- 👤 Heinz Diermeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:26
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4402
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
67 words
In an optical transmission element comprising at least one light waveguide that is accommodated in the interior of a two-layer outside sheath and has a soft, oil-containing filling compound provided between the light waveguide and sheath, the improvements comprising the inside layer of said two-layer sheath being composed of a polyolefin and the outside layer of the two-layer sheath being composed of a polyester, particularly a polycarbonate.
Claim 2
Dependent Claim
67 words
In an optical transmission element comprising at least one light waveguide that is accommodated in the interior of a two-layer outside sheath and has a soft, oil-containing filling compound provided between the light waveguide and sheath, the improvements comprising the inside layer of said two-layer sheath being composed of a polyolefin and the outside layer of the two-layer sheath being composed of a polyester, particularly a polycarbonate.
Claim 3
Dependent Claim
27 words
In an optical transmission element according to claim 1, wherein the inside layer has a mean E-modulus in a range between 500 and 1100 N/mm 2 .
Claim 4
Dependent Claim
22 words
In an optical transmission element according to claim 1, wherein the inside layer has a melting point that lies above 100° C.
Claim 5
Dependent Claim
46 words
In an optical transmission element according to claim 1, wherein a swelling of the material of the inside layer due to hydrocarbon oil of the filling compound at a temperature up to 80° C. is held below 6 weight percent oil absorption from the filling compound.
Claim 6
Dependent Claim
25 words
In an optical transmission element according to claim 1, wherein the material of the inside layer of the sheath has a high melt flow index.
Claim 7
Dependent Claim
25 words
In an optical transmission element according to claim 1, wherein the material of the inside layer provides no rupturing at a temperature of -40° C.
Claim 8
Dependent Claim
16 words
In an optical transmission element according to claim 1, wherein the inside layer is a polyethylene.
Claim 9
Dependent Claim
29 words
In an optical transmission element according to claim 7, wherein the polyethylene of the inside layer is an ultra-high molecular polyethylene having a mol weight greater than 1 million.
Claim 10
Dependent Claim
24 words
In an optical transmission element according to claim 7, wherein the polyethylene has a high density in a range between 0.94 and 0.96 g/ml.
Claim 11
Dependent Claim
25 words
In an optical transmission element according to claim 1, wherein the inside layer is formed of a modified polypropylene, which is a copolymer with polyethylene.
Claim 12
Dependent Claim
17 words
In an optical transmission element according to claim 1, wherein the outside layer is a polybutylene terephthalate.
Claim 13
Dependent Claim
23 words
In an optical transmission element according to claim 1, wherein the material of the outside layer is a high-molecular weight polybutylene terephthalate/polycarbonate blend.
Claim 14
Dependent Claim
30 words
In an optical transmission element according to claim 1, wherein the material of the outside layer has an E-modulus value in a range between 1200 and 2000 N/mm 2 .
Claim 15
Dependent Claim
24 words
In an optical transmission element according to claim 13, wherein the E-modulus value of the outside layer is greater than 1500 N/mm 2 .
Claim 16
Dependent Claim
29 words
In an optical transmission element according to claim 1, wherein the outside layer absorbs less than 0.2 weight percent hydrocarbon oils at up to a temperature of 80° C.
Claim 17
Dependent Claim
28 words
In an optical transmission element according to claim 1, wherein the outside layer has a thermal expansion below 10 -4 /K up to a temperature of 80° C.
Claim 18
Dependent Claim
89 words
In an optical transmission element according to claim 1, wherein the inside layer has an E-modulus between 500 and 1100 N/mm 2 , has a melting point that lies above 100° C., is of a material with a swelling due to hydrocarbon oil of the filling compound at a temperature of up to 80° C. that lies below 6 weight percent oil absorption from the filling compound; said material of the inside layer having a high flow index, and provides no rupturing down to a temperature of -40° C.
Claim 19
Dependent Claim
38 words
In an optical transmission element according to claim 17, wherein the material of the inside layer is an ultra-high molecular polyethylene having a mol weight greater than 100 million, and a density in a range of 0.94-0.96 g/ml.
Claim 20
Dependent Claim
64 words
In an optical transmission element according to claim 17, wherein the outside layer is a material having an E-modulus value between 1200 and 2000 N/mm 2 , said material absorbing less than 0.2 weight percent hydrocarbon oils of the filing compound up to a temperature of 80° C. and having a thermal expansion below 10 -4 /K up to a temperature of 80° C.
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) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |