US3774403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for roadbed traversing by pipeline
Assignee: Northern Natural Gas Co
•
Filing: 1971-09-08
•
Granted: 1973-11-27
•
Expires: 1991-09-08
Abstract
Abstract A casing pipe is extended laterally in a roadbed beneath the roadway, a pipeline smaller than the casing pipe is extended through the casing pipe and the space between the exterior surface of the pipeline and the interior surface of the casing pipe is filled with polymeric electrically nonconductive material.
Inventors
- 👤 R Cushing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:30
CPC Classifications
F; F16; F16L; F16L7/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
A combination according to claim 1 in which the casing pipe and the pipeline are metal.
Claim 2
Dependent Claim
27 words
A combination according to claim 1 in which each side of the roadway has a ditch and the casing pipe extends from one ditch to the other.
Claim 3
Dependent Claim
15 words
A combination according to claim 1 in which the polymeric material is a foamed-in-place material.
Claim 4
Independent Claim
68 words
The method which comprises: installing a water-tight casing pipe horizontally beneath a roadway on a roadbed, installing a pipeline in the casing pipe with clearance between the pipeline and the casing pipe, centering the pipeline in the casing pipe by means of spacers, applying a cathodic protection system to the pipeline, and applying a polymeric electrically nonconductive material in the space between the pipeline and the casing pipe.
Claim 5
Dependent Claim
12 words
The method of claim 5 in which the polymeric material is foamed-in-place.
Claim 6
Dependent Claim
14 words
The method of clAim 5 in which the casing pipe and pipeline are metal.
Claim 7
Dependent Claim
20 words
The method of claim 5 in which the casing pipe ends terminate at ditches on each side of the road-bed.
References Cited (Backward Citations)
US1210187A
Cited
DE617556C
Cited
US2896669A
Cited
US2924245A
Cited
US3254012A
Cited
US3559660A
Cited
US3492029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |