Patent US4641916A successfully refreshed from Google Patents.
US4641916A
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Optical transmission element
Assignee: Siemens AG
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Filing: 1984-12-20
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Granted: 1987-02-10
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Expires: 2004-12-20
Abstract
Abstract The optical transmission element (AD) comprises a light waveguide (LW) provided with a cushion layer (PS), said light waveguide being positioned within a hard sheath (HL). A glide layer (GS) is provided between said sheath (HL) and said cushion layer (PS). The sheath (HL) is of a material having a modulus of elasticity greater than 2000 N/mm 2 and a coefficient of thermal expansion less than 0.8×10 -4 /°K.
Inventors
- 👤 Ulrich Oestreich
- 👤 Ernst Mayr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:23
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4402; G02B6/4429; G02B6/443
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
An optical transmission element (AD) comprising: a fibrous light waveguide (LW); a cushion layer (PS) engaging and surrounding said waveguide; a hard sheath (HL) surrounding and protecting said waveguide and cushion layer; a glide layer (GS) disposed between and engaging each of said sheath (HL) and said cushion layer (PS) for accommodating movement between said sheath (HL) and cushion layer (PS), wherein the physical properties of said sheath include an elastic modulus (E) greater than 2000 N/mm 2 and a coefficient of thermal expansion less than 0.8×10 -4 /K.
Claim 2
Dependent Claim
89 words
An optical transmission element (AD) comprising: a fibrous light waveguide (LW); a cushion layer (PS) engaging and surrounding said waveguide; a hard sheath (HL) surrounding and protecting said waveguide and cushion layer; a glide layer (GS) disposed between and engaging each of said sheath (HL) and said cushion layer (PS) for accommodating movement between said sheath (HL) and cushion layer (PS), wherein the physical properties of said sheath include an elastic modulus (E) greater than 2000 N/mm 2 and a coefficient of thermal expansion less than 0.8×10 -4 /K.
Claim 3
Dependent Claim
21 words
The transmission element of claim 1 wherein said coefficient of thermal expansion is between 0.5×10 -4 /K. and 0.7×10 -4 /K.
Claim 4
Dependent Claim
14 words
The transmission element of claim 1 wherein said cushion layer (PS) is ultraviolet cross-linked.
Claim 5
Dependent Claim
17 words
The transmission element of claim 1 wherein said sheath (HL) is a high-molecular weight, impact-resistant, injection-moldable aramide.
Claim 6
Dependent Claim
22 words
The transmission element of claim 1 wherein said glide layer (GS) consists essentially of a cross-linkable material which exhibits load bearing properties.
Claim 7
Dependent Claim
22 words
The transmission element of claim 1 wherein said glide layer (GS) consists essentially of a thixotropic material which exhibits load bearing properties.
Claim 8
Dependent Claim
23 words
The transmission element of claim 1 wherein the glide layer (GS) has an elastic modulus (E) less than about 0.01 N/mm 2 .
Claim 9
Dependent Claim
25 words
The transmission element of claim 7 wherein the elastic modulus (E) of the glide layer (GS) is between about 0.01 and 0.001 N/mm 2 .
Claim 10
Dependent Claim
37 words
The transmission element of claim 1 wherein there is further provided an adherent protective layer (SU) on the outer surface of said sheath, said protective layer exhibiting low stress cracking susceptibility as compared to said sheath (HL).
Claim 11
Dependent Claim
28 words
The transmission element of claim 9 wherein the wall thickness of said protective layer (SU) is between 10% and 50% of the wall thickness of said sheath (HL).
Claim 12
Dependent Claim
25 words
The transmission element of claim 10 wherein the wall thickness of the protective layer (SU) is about 30% of the wall thickness of said sheath.
Claim 13
Dependent Claim
21 words
The transmission element of claim 9 wherein the wall thickness of said protective layer (SU) is between 10 and 80 μm.
References Cited (Backward Citations)
US4072400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |