US4169657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated strength members for fiber optic cable
Assignee: BRAND-REX WILLIMATIC CT
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Filing: 1978-03-02
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Granted: 1979-10-02
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Expires: 1998-03-02
Abstract
Abstract A fiber optic cable having a plurality of pre-stretched strength members associated therewith. The strength members are maintained in a pre-stretched condition by adhering the strength members to at least one laminant after stretching. The strength members are pre-stretched by a stretching force equal to or greater than the predetermined longitudinal break strength for associated optical fibers. The laminate holding the strength members is placed in a direction parallel to the fiber optic core and substantially surrounding the core. Thus, the strength members will provide a force on the termination opposite the longitudinal stress forces placed on the fiber optic core.
Inventors
- 👤 Kenneth L. Bedard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:38
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/443; G02B6/4432
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
86 words
A fiber optic cable comprising: a fiber optic core including at least one optical fiber adapted to receive optical communication signals; at least one elastic strength member substantially straight and parallel to said fiber optic core; said strength member being in a stretched condition; means for maintaining said strength member substantially straight and in a stretched condition whereby said strength member is adapted to apply a force in the opposite direction to longitudinal stress forces on said cable for protecting said optical fiber from longitudinal stress.
Claim 2
Dependent Claim
86 words
A fiber optic cable comprising: a fiber optic core including at least one optical fiber adapted to receive optical communication signals; at least one elastic strength member substantially straight and parallel to said fiber optic core; said strength member being in a stretched condition; means for maintaining said strength member substantially straight and in a stretched condition whereby said strength member is adapted to apply a force in the opposite direction to longitudinal stress forces on said cable for protecting said optical fiber from longitudinal stress.
Claim 3
Dependent Claim
22 words
A cable as set forth in claim 1 further including a plurality of elastic strength members parallel to said fiber optic core.
Claim 4
Dependent Claim
44 words
A cable as set forth in claim 2 wherein said plurality of elastic strength members are adhered to and supported by at least one laminant, said laminant including an adhesive on one side thereof for holding said elastic strength members in said stretched condition.
Claim 5
Dependent Claim
22 words
A cable as set forth in claim 3 wherein said plurality of elastic strength members are substantially evenly spaced from one another.
Claim 6
Dependent Claim
41 words
A cable as set forth in claim 1 wherein said means for maintaining includes at least one laminant and an adhesive on one side of said laminant; at least one elastic strength member being secured to said laminant by said adhesive.
Claim 7
Dependent Claim
27 words
A cable as set forth in claim 1 wherein said at least one elastic strength member is taken from the group consisting of Kevlar, nylon and polyester.
Claim 8
Dependent Claim
37 words
A cable as set forth in claim 1 wherein said at least one elastic strength member has a tensil modulus in the range of 7×10 6 pounds per square inch to 19×10 6 pounds per square inch.
Claim 9
Dependent Claim
32 words
A cable as set forth in claim 1 wherein said at least one elastic strength member will not substantially elongate under forces equal to the break strength of the fiber optic core.
Claim 10
Dependent Claim
22 words
A cable as set forth in claim 1 wherein said at least one strength member is laminated between a pair of tapes.
Claim 11
Dependent Claim
74 words
A fiber optic cable comprising: a fiber optic core having at least one glass fiber; a plurality of strength members, said strength members being substantially straight and having been stretched beyond their normal length; at least one laminant; an adhesive applied to said laminant; said stretched strength members secured to said laminant by said adhesive; said strength members surrounding said fiber optic core; a protective sheath surrounding said core and said laminated strength members.
Claim 12
Dependent Claim
74 words
A fiber optic cable comprising: a fiber optic core having at least one glass fiber; a plurality of strength members, said strength members being substantially straight and having been stretched beyond their normal length; at least one laminant; an adhesive applied to said laminant; said stretched strength members secured to said laminant by said adhesive; said strength members surrounding said fiber optic core; a protective sheath surrounding said core and said laminated strength members.
Claim 13
Independent Claim
81 words
A method for providing longitudinal stress protection for a fiber optic cable comprising the steps of: providing an optical fiber having a predetermined longitudinal break force; stretching at least one elastic strength member with a force equal to or greater than the break strength force of said optical fiber; applying said at least one strength member to a laminant; securing said strength member to said laminant in a straight stretched condition with an adhesive; circumscribing said optical fiber with the laminant.
Claim 14
Independent Claim
81 words
A method for providing longitudinal stress protection for a fiber optic cable comprising the steps of: providing an optical fiber having a predetermined longitudinal break force; stretching at least one elastic strength member with a force equal to or greater than the break strength force of said optical fiber; applying said at least one strength member to a laminant; securing said strength member to said laminant in a straight stretched condition with an adhesive; circumscribing said optical fiber with the laminant.
Claim 15
Dependent Claim
23 words
The method of making the cable as set forth in claim 11 further including the step of extruding a sheath over said laminant.
References Cited (Backward Citations)
US3691001A
Cited
US3855897A
Cited
US3813098A
Cited
US3883218A
Cited
US4009932A
Cited
US4093342A
Cited
GB1486227A
Cited
FR2296192A1
Cited
US4113349A
Cited
FR2319912A1
Cited
US4138193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |