Source: http://www.google.com/patents/US7599589?dq=6,654,957
Timestamp: 2017-03-24 20:53:23
Document Index: 710494044

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 06014897', 'Application No. 06014897']

Patent US7599589 - Gel-free buffer tube with adhesively coupled optical element - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsIn a buffer tube arrangement, discrete domains of adhesive material provide adhesive coupling of a water-swellable element and an optical fiber bundle that includes a plurality of optical fibers....http://www.google.com/patents/US7599589?utm_source=gb-gplus-sharePatent US7599589 - Gel-free buffer tube with adhesively coupled optical elementAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7599589 B2Publication typeGrantApplication numberUS 12/018,604Publication dateOct 6, 2009Filing dateJan 23, 2008Priority dateJul 20, 2005Fee statusPaidAlso published asUS20080145010Publication number018604, 12018604, US 7599589 B2, US 7599589B2, US-B2-7599589, US7599589 B2, US7599589B2InventorsBob J. Overton, Greg Dechristopher, Wayne CheatleOriginal AssigneeDraka Comteq B.V.Export CitationBiBTeX, EndNote, RefManPatent Citations (47), Non-Patent Citations (8), Referenced by (122), Classifications (5), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetGel-free buffer tube with adhesively coupled optical element
US 7599589 B2Abstract
In a buffer tube arrangement, discrete domains of adhesive material provide adhesive coupling of a water-swellable element and an optical fiber bundle that includes a plurality of optical fibers.
a water-swellable element disposed between said optical fiber bundle and said buffer tube, said water-swellable element substantially enclosing said optical fiber bundle; and
a plurality of discrete domains of adhesive material adhesively coupling said water-swellable element and said optical fiber bundle without requiring frictional coupling.
2. The buffer tube arrangement of claim 1, wherein said plurality of discrete domains of adhesive material provide the predominant coupling force between said water-swellable element and said optical fiber bundle.
3. The buffer tube arrangement of claim 1, wherein said discrete domains of adhesive material are provided on said optical fiber bundle.
4. The buffer tube arrangement of claim 1, wherein said discrete domains of adhesive material are provided on said water-swellable element.
5. The buffer tube arrangement of claim 1, wherein said adhesive material comprises a curable adhesive material.
6. The buffer tube arrangement of claim 1, wherein said optical fiber bundle comprises a ribbon stack.
7. The buffer tube arrangement of claim 1, wherein said optical fiber bundle comprises helically wound optical fibers.
8. The buffer tube arrangement of claim 1, wherein said water-swellable element comprises water-absorbing tape and/or water-absorbing yarn.
9. The buffer tube arrangement of claim 8, wherein said water-swellable element comprises water-absorbing particles.
10. The buffer tube arrangement of claim 1, wherein said water-swellable element comprises a water-swellable powder sandwiched between two layers.
11. The buffer tube arrangement of claim 1, wherein the buffer tube arrangement is essentially free of thixotropic filling gel.
12. A buffer tube arrangement, comprising:
a plurality of discrete domains of adhesive foam adhesively coupling said water-swellable element and said optical fiber bundle, wherein said plurality of discrete domains of adhesive foam predominantly comprise dots of adhesive foam (i) having an average diameter of less than about one millimeter and (ii) being spaced from one another by at least about one millimeter.
13. The buffer tube arrangement of claim 12, wherein said plurality of discrete domains of adhesive foam provide the predominant coupling force between said water-swellable element and said optical fiber bundle.
14. The buffer tube arrangement of claim 12, wherein degree of foaming of said adhesive foam is between about 1 percent and 95 percent.
15. The buffer tube arrangement of claim 12, wherein said adhesive foam comprises thermoplastic foam.
16. The buffer tube arrangement of claim 12, wherein said adhesive foam comprises thermoset foam.
17. The buffer tube arrangement of claim 12, wherein said adhesive foam comprises silicone.
18. A method of making a gel-free buffer tube, comprising:
applying discrete domains of adhesive foam to the ribbon stack of optical fibers and/or the water-swellable tape to bond the ribbon stack of optical fibers and the water-swellable tape without requiring frictional coupling;
extruding a polymeric buffer tube around both the ribbon stack of optical fibers and the water-swellable tape.
19. A buffer tube arrangement according to claim 12 wherein said plurality of discrete domains of adhesive foam adhesively couples said water-swellable element and said optical fiber bundle without requiring frictional coupling.
20. A buffer tube arrangement according to claim 12 wherein said plurality of discrete domains of adhesive foam resists movement of the optical fibers relative to the water-swellable element without requiring the application of an external compressive force upon the water-swellable element.
21. A buffer tube arrangement according to claim 1, wherein said discrete domains of adhesive material comprise discrete domains of adhesive foam.
22. A buffer tube arrangement, comprising:
a plurality of discrete domains of adhesive material adhesively coupling said water-swellable element and said optical fiber bundle, wherein said plurality of discrete domains of adhesive material resists movement of the optical fibers relative to the water-swellable element without requiring the application of an external compressive force upon the water-swellable element.
23. The buffer tube arrangement of claim 22, wherein said plurality of discrete domains of adhesive material provide the predominant coupling force between said water-swellable element and said optical fiber bundle.
24. A buffer tube arrangement according to claim 22, wherein said discrete domains of adhesive material comprise discrete domains of adhesive foam.
25. The buffer tube arrangement of claim 22, wherein said water-swellable element comprises water-absorbing particles.
26. The buffer tube arrangement of claim 22, wherein said water-swellable element comprises a water-swellable powder sandwiched between two layers.
27. The buffer tube arrangement of claim 22, wherein the buffer tube arrangement is essentially free of thixotropic filling gel. Description
This application is a continuation-in-part of U.S. application Ser. No. 11/424,112, filed Jun. 14, 2006 (and published Jan. 25, 2007, as U.S. Patent Application Publication No. 2007/0019915 A1), which itself claims the benefit of U.S. Provisional Application No. 60/700,739, filed Jul. 20, 2005; U.S. Provisional Application No. 60/710,654, filed Aug. 24, 2005; and U.S. Provisional Application No. 60/764,776, filed Feb. 3, 2006. This application further claims the benefit of pending U.S. Provisional Application No. 60/886,235, filed Jan. 23, 2007. The foregoing commonly assigned applications and publication are hereby incorporated by reference in their entirety.
An example of a thermally curing material which may be used as curable adhesive material 18 is a two-part, room temperature vulcanizing (RTV) silicone, such as GE RTV615, which may be foamed before application in the buffer tube. Another example is a RTV silicone that is self-foaming a few seconds after application, such as, for example, Dow Corning's 3-8159 RF silicone foam. Another example is a two-part urethane, which also may be foamed during mixing or which can be formulated to self-foam during the curing process. Examples of the latter are Reoflex urethane rubbers sold by Smooth-On Corp. These kinds of materials can also be formulated with a very low modulus that does not change substantially with temperature excursions normally encountered in the environments in which optical fiber cables may be deployed.
The method for applying the curable adhesive material 18 is not particularly limited. For example, curable adhesive material 18 may be applied as a continuous bead or an intermittent bead. Also, a plurality of beads may be applied (e.g. two beads, intermittent or continuous, a certain number of degrees apart, such as 180°).
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