US4729409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hexagonal underground electrical conduit
Assignee: Borg Warner Corp
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Filing: 1982-08-06
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Granted: 1988-03-08
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Expires: 2002-08-06
Abstract
Abstract An underground electrical conduit hexagonal in cross-section and having internal partition walls subdividing the conduit into a plurality of longitudinal ducts. The internal partition walls are symmetrically disposed about a central longitudinal axis of the conduit and serve as bracing structure to strengthen and support the outer walls of the conduit.
Inventors
- 👤 Howard C. Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:42
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/02; H02G3/04; H02G3/0462; H02G3/0487; F; F16; F16L; F16L9/00; F16L9/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
In a conduit for electrical cable having outer walls and a plurality of partition walls subdividing said conduit into a plurality of longitudinal ducts, the improvement wherein the outer walls of said conduit define an equiangular hexagon having arcuate vertices, the partition walls are symmetrically disposed about the longitudinal axis of said conduit to form at least seven longitudinal ducts, each of said partition walls in contact with one of said outer walls is normal thereto, and said ducts are of equal size as defined by the maximum diameter circular cable that may be inserted therein.
Claim 2
Dependent Claim
96 words
In a conduit for electrical cable having outer walls and a plurality of partition walls subdividing said conduit into a plurality of longitudinal ducts, the improvement wherein the outer walls of said conduit define an equiangular hexagon having arcuate vertices, the partition walls are symmetrically disposed about the longitudinal axis of said conduit to form at least seven longitudinal ducts, each of said partition walls in contact with one of said outer walls is normal thereto, and said ducts are of equal size as defined by the maximum diameter circular cable that may be inserted therein.
Claim 3
Dependent Claim
39 words
The conduit of claim 1 wherein each of said partition walls in contact with said outer walls extends normally inwardly therefrom and wherein each of said partition walls joins at least two additional partition walls at angles of 120°.
Claim 4
Dependent Claim
24 words
The conduit of claim 1 wherein said conduit and said interior partition walls are integrally formed from a thermoplastic resin by an extrusion process.
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) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |