US4767184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waterproof optical cable
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1987-04-07
•
Granted: 1988-08-30
•
Expires: 2007-04-07
Abstract
Abstract An optical fiber cable in which plural optical fibers are joined in a flat assembly. Each assembly is coated with a water-swelling resin, stacked with other such flat assemblies and fitted in a spiral groove of a spacer. A tape is wound around the so-fitted spacer.
Inventors
- 👤 Ichiro Ogasawara
- 👤 Nobumasa Nirasawa
- 👤 Akira Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:08
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4479; G02B6/448; G02B6/4401; G02B6/4407; G02B6/441; G02B6/4415; G02B6/4427; G02B6/4429; G02B6/44384
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A waterproof optical cable, comprising: a rodlike spacer having a plurality of spiral grooves on its peripheral surface; stacks fitted into at least some of said grooves, each stack comprising a plurality of substantially flat optical conductors stacked together in a radial direction of said spacer and coating resin film layer containing a water swelling material coated on a surface of each of said optical conductors; and a water absorbent filling any of said grooves not fitted with one of said stacks.
Claim 2
Dependent Claim
82 words
A waterproof optical cable, comprising: a rodlike spacer having a plurality of spiral grooves on its peripheral surface; stacks fitted into at least some of said grooves, each stack comprising a plurality of substantially flat optical conductors stacked together in a radial direction of said spacer and coating resin film layer containing a water swelling material coated on a surface of each of said optical conductors; and a water absorbent filling any of said grooves not fitted with one of said stacks.
Claim 3
Dependent Claim
29 words
A waterproof optical cable as recited in claim 1, wherein said coating resin film layer is provided on only one of plural principal surfaces of said flat optical conductors.
Claim 4
Dependent Claim
24 words
A waterproof optical cable as recited in claim 1, wherein said coating resin film layer surrounds all exterior surfaces of said flat optical conductors.
Claim 5
Dependent Claim
24 words
A waterproof optical cable as recited in claim 1, wherein each of said flat optical conductors comprises a plurality of optical fibers joined together.
Claim 6
Dependent Claim
23 words
A waterproof optical cable as recited in claim 1, further comprising a water absorbent filling said grooves between said stacks and said spacer.
Claim 7
Dependent Claim
62 words
A waterproof optical cable as recited in claim 1, comprising a plurality of said spacers each having said stacks; a wound tape surrounding said plurality of said spacers; a first waterproofing material filling space among said spacers, and between said spacers and said wound tape; a sheath surrounding said wound tape; and second waterproofing material between said sheath and said wound tape.
References Cited (Backward Citations)
US3944717A
Cited
US4123137A
Cited
US4002819A
Cited
US4401366A
Cited
DE3118172A1
Cited
US4596443A
Cited
GB2122767A
Cited
US4711523A
Cited
US4703998A
Cited
US4701015A
Cited
EP0159575A1
Cited
GB2157848A
Cited
US4717236A
Cited
US4720164A
Cited
JPS6134512A
Cited
JPS6153612A
Cited
JPS6173113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |