The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 1989
Filed:
Sep. 21, 1987
Masumi Fukuma, Kanagawa, JP;
Nobuhiro Akasaka, Kanagawa, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
Disclosed is an optical fiber cable which prevents water from running or spreading toward the cable interior. The optical fiber cable comprises at least one optical fiber unit, an outermost sheath member, and a water absorbing and swelling member. The optical fiber unit includes a central spacer formed with grooves, and at least one coated optical fiber or optical fiber tape disposed in each of the grooves. The outermost sheath member surrounds the optical fiber unit, and the water absorbing and swelling member is filled in spaces defined between the optical fiber unit and the outermost sheath member. The water absorbing and swelling member comprises a non-water absorbing and non-swelling base and water absorbing and swelling material fixed to a surface of the base. In another embodiment of the invention, the water absorbing and swelling member is in the form of a tape in which a layer of water absorbing and swelling material is bonded to one or both surfaces of a film like flexible base. The water absorbing and swelling tape member is disposed in grooves of the spacer together with optical fiber tapes.