Patent US4076382A successfully refreshed from Google Patents.
US4076382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical cable with plastic multilayer sheath
Assignee: Siemens AG
•
Filing: 1976-11-11
•
Granted: 1978-02-28
•
Expires: 1996-11-11
Abstract
Abstract In order to protect the transmission elements in an optical cable against mechanical stresses the cable is provided with a plastic sheath which consists of an inner layer of polyurethane and an outer layer of polyvinylchloride with a serving of polyamide filaments arranged between the cable core and the inner layer and also between the inner and outer layers of the sheath.
Inventors
- 👤 Ulrich Oestreich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:03
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/443; G02B6/4432
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
In an optical cable of the type comprising a cable core containing optical transmission elements and a multilayer sheath surrounding the cable core made of plastic with an outer layer of polyvinylchloride, the improvement comprising: a. a layer of thermpolastic polyurethane disposed between the outer layer of polyvinylchloride and the cable core; b. a first serving of filaments of an aromatic polyamide disposed between said cable core and said polyurethane; and c. a second serving of filaments of an aromatic polyamide arranged between said outer layer of polyvinylchloride and said polyurethane.
Claim 2
Dependent Claim
91 words
In an optical cable of the type comprising a cable core containing optical transmission elements and a multilayer sheath surrounding the cable core made of plastic with an outer layer of polyvinylchloride, the improvement comprising: a. a layer of thermpolastic polyurethane disposed between the outer layer of polyvinylchloride and the cable core; b. a first serving of filaments of an aromatic polyamide disposed between said cable core and said polyurethane; and c. a second serving of filaments of an aromatic polyamide arranged between said outer layer of polyvinylchloride and said polyurethane.
Claim 3
Dependent Claim
12 words
The improvement according to claim 1 wherein said aromatic polyamide is pre-stretched.
Claim 4
Dependent Claim
18 words
The improvement according to claim 1 wherein the lay direction of said first and second servings is opposite.
References Cited (Backward Citations)
US3883218A
Cited
FR2265108A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |