Optical waveguides – Optical transmission cable – Loose tube type
Reexamination Certificate
2008-10-09
2010-10-12
Kim, Ellen (Department: 2874)
Optical waveguides
Optical transmission cable
Loose tube type
C385S100000, C385S109000
Reexamination Certificate
active
07813606
ABSTRACT:
It is an object of the present invention to provide an optical fiber cable which can reliably prevent increased transmission loss due to damage of the optical fiber as a result of the egg-laying behavior of cicadas. The cable includes at least an optical fiber1, tension members6and a sheath3. The sheath3has a shore D hardness of 55 or more and a minimum distance L from a surface of the optical fiber1to an outer surface of the sheath3of greater than 0.3 mm. Further, in the cable, the surface of sheath3has a coefficient of friction of 0.45 or less and the sheath3has a shore D hardness of 57 or more. In addition, the cable is made by using a specific flame retardant composition (P) as the sheath material.
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Masao Iwano et al., “Polyamide 12 and Applications—Protection for Optical Fibers-”, “Plastic” Extra No., Plastics in Electronics Field, Apr. 21, 1999, 5 Pages.
Aragaki Masanobu
Iwano Mitsuru
Nishiguchi Masaki
Rintsu Yoshihisa
Tsukamoto Masayoshi
Kim Ellen
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
The Furukawa Electric Co. Ltd.
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