Patent US4448484A successfully refreshed from Google Patents.
US4448484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fiber element with three layer protective covering
Assignee: Pirelli and C SpA
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Filing: 1982-03-31
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Granted: 1984-05-15
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Expires: 2002-03-31
Abstract
Abstract An optical fiber element comprising an optical fiber surrounded and protected from mechanical stresses by three layers of plastic material, the intermediate layer having a modulus of elasticity substantially less than the moduli of elasticity of the adjacent inner and outer layers and less than one Kilogram/mm 2 .
Inventors
- 👤 Aurelio Lombardi
- 👤 Elio Occhini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:16
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/1065; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4402; G02B6/4429; G02B6/443
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
108 words
An optical fiber element for a communication cable comprising an optical fiber and three layers of plastomeric or elastomeric material surrounding said fiber along its length, a first one of said layers surrounding and being in contact with said fiber, a second one of said layers surrounding and being in contact with said first layer and a third one of said layers surrounding and being in contact with said second layer and said second layer having a modulus of elasticity less than the modulus of elasticity of said first layer and said third layer and having a modulus of elasticity less than one Kilogram per mm 2 .
Claim 2
Dependent Claim
108 words
An optical fiber element for a communication cable comprising an optical fiber and three layers of plastomeric or elastomeric material surrounding said fiber along its length, a first one of said layers surrounding and being in contact with said fiber, a second one of said layers surrounding and being in contact with said first layer and a third one of said layers surrounding and being in contact with said second layer and said second layer having a modulus of elasticity less than the modulus of elasticity of said first layer and said third layer and having a modulus of elasticity less than one Kilogram per mm 2 .
Claim 3
Dependent Claim
35 words
An optical fiber element as set forth in claim 1 wherein the ratio of the modulus of elasticity of said first layer to the modulus of elasticity of said second layer is at least 300.
Claim 4
Dependent Claim
46 words
An optical fiber element as set forth in claim 2 wherein said first layer is made of a thermosetting resin and wherein the ratio of the modulus of elasticity of said third layer to the modulus of elasticity of said second layer is at least 50.
Claim 5
Dependent Claim
18 words
An optical fiber element as set forth in claim 3 wherein said thermosetting resin is an epoxy resin.
Claim 6
Dependent Claim
37 words
An optical fiber element as set forth in claim 1 or 2 wherein the ratio of the modulus of elasticity of said third layer to the modulus of elasticity of said second layer is at least 50.
Claim 7
Dependent Claim
22 words
An optical fiber element as set forth in claim 1 or 2 wherein said first layer is made of a thermosetting resin.
Claim 8
Dependent Claim
17 words
An optical fiber element as set forth in claim 6 wherein said resin is an epoxy resin.
Claim 9
Dependent Claim
22 words
An optical fiber element as set forth in claim 1 or 2 wherein said second layer is made of an elastomeric resin.
Claim 10
Dependent Claim
16 words
An optical fiber element as set forth in claim 8 wherein said resin is silicone rubber.
Claim 11
Dependent Claim
22 words
An optical fiber element as set forth in claim 1 or 2 wherein said third layer is made of a thermoplastic resin.
Claim 12
Dependent Claim
15 words
An optical fiber element as set forth in claim 10 wherein said resin is nylon.
Claim 13
Dependent Claim
22 words
A cable comprising a plurality of elements, at least one of said elements being the optical fiber of claim 1 or 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |