 Method of electron beam exposure |
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| Device for recognizing the impact site of a charge carrier beam on a target |
| The invention is therefore based on the task of obtaining an actual position signal of the impact ... |
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| Method for dry etching vias in integrated circuit layers |
| OF THE DRAWINGS Referring to FIG. 1, a schematic representation of an etching apparatus according ... |
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| Process for forming a buried drain or collector region in monolithic semiconductor devices |
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| Golf ball |
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| Optoelectronic switching and display device with porous silicon |
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| Method of forming porous silicon |
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| Lightweight neutron detector |
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Optical fiber cable provided with stabilized waterblocking material
| Details |
Inventors: Kaufman, Stanley; Sheu, Jim J.;
Assignee: AT&T Bell Laboratories (Murray Hill, NJ)
Primary Examiner: Lee; John D.
Assistant Examiner:
Attorney, Agent or Firm: Hayes, Jr.; Donald E.
A cable of this invention includes a core comprising a plurality of coated optical fibers and a filling composition of matter which is disposed about the fibers. Typically, the fibers and the filling material are diposed within a tubular member which is disposed within a sheath system. The sheath system include longitudinally extending strength members and a plastic jacket. The filling composition which fills interstices in the core is one which includes an oil constituent which is a relatively high molecular weight aliphatic hydrocarbon. The aliphatic hydrocarbon is a synthetic oil such as polyalphaolefin or mineral oil. A relatively large percent by weight of an antioxidant system is used to prevent thermal oxidative degradation of the filling material as well as of materials in contact with the filling material. Advantageously, for stabilization and metal deactivation, the composition includes zinc dialkyldithiophosphate or diaryldithiophosphate. A styreneethylene propylene copolymer is also included in order to reduce oil separation of the filling material. A fumed silica is used to impart gel properties to the material. |
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DETAILED DESCRIPTION Referring now to FIGS.
1 and 2, there is shown a communications cable which may incorporate the improved filling material of the present invention and which is designated generally by the numeral 20 and which has a longitudinal axis 21.
It includes a core 22 comprising optical fibers 25--25 which may be arranged in one or more units 24--24.
Each of the optical fibers is provided with a protective coating system which typically includes an inner primary coating layer and an outer secondary coating layer.
Also, each of the coated fibers may be buffered with an outer layer of polyvinyl chloride (PVC), for example.
Each of the units 24--24 may be wrapped with a binder ribbon 23.
The core 22 includes a waterblocking material 26 which is disposed within a tubular member 28 of a sheath system 27.
The tubular member 28 often is referred to as a core tube.
The tubular member 28 may be enclosed by a metallic shield 29 and an outer plastic jacket 32.
The sheath system 27 also may include strength members 30--30.
Also, a waterblocking tape 35 may be wrapped about an outer surface of the core tube 28.
The tape 35 may be a waterblocking tape which is disclosed, for example, in U.
S.
Pat.
No.
4,867,526 which issued on Sep.
19, 1989 in the name of C.
J.
Arroyo.
Also, the filling material 26 may be used to fill the core of a cable which includes optical fiber ribbons such as those disclosed in U.
S.
Pat.
No.
4,900,176 which issued on Feb.
13, 1990 in the names of K.
W.
Jackson, et al.
Constraints on the sought after filling material which includes an oil constituent include oil separation, and associated cable drip temperature, critical yield stress and viscosity of the filling material.
As mentioned hereinbefore, these constraints usually are antagonistic to each other.
Priorly, it has been demonstrated that low pour point oils produce filling materials the critical yield stress of which at low temperatures decreases with decreasing pour point.
The pour point of a material is the lowest temperature at which a sample of the material may be poured
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Quantum Computing 
