US4112247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas feeder pipe assembly including electrical conductors
Assignee: AT&T Inc
•
Filing: 1976-09-20
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Granted: 1978-09-05
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Expires: 1996-09-20
Abstract
Abstract A gas feeder pipe assembly includes a central duct capable of functioning as a gas feeder pipe and a plurality of pairs of electrical conductors in a unitary structure. The gas feeder pipe is located at the center of the structure, and the conductors surround the pipe in an oscillating lay. The pipe and the conductors are wrapped in a polyester film and enclosed in a coated aluminum sheath. A polyethylene jacket bonded to the aluminum sheath provides the outermost protection for the assembly.
Inventors
- 👤 Matthew R. Dembiak
- 👤 John F. Finnegan
- 👤 Thomas B. Reece
- 👤 Howard W. Rudolph, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:20
CPC Classifications
F; F16; F16L; F16L9/00; H; H01; H01B; H01B7/00; H01B7/0072
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A conduit which comprises: a central duct formed of a cylindrically rolled sheath bonded with an overlap to itself, and a plastic extrusion duct jacket bonded around the sheath in a pressurable combination for carrying a fluid under pressure, the duct jacket having a smooth outer surface; a plurality of electrical, insulated conductors located in a peripheral skew about the duct, the conductors being slidably supported against the outer surface of the duct jacket; and a continuously electrically conductive, flexible metal tube enclosing the duct and the conductors.
Claim 2
Dependent Claim
88 words
A conduit which comprises: a central duct formed of a cylindrically rolled sheath bonded with an overlap to itself, and a plastic extrusion duct jacket bonded around the sheath in a pressurable combination for carrying a fluid under pressure, the duct jacket having a smooth outer surface; a plurality of electrical, insulated conductors located in a peripheral skew about the duct, the conductors being slidably supported against the outer surface of the duct jacket; and a continuously electrically conductive, flexible metal tube enclosing the duct and the conductors.
Claim 3
Dependent Claim
26 words
A conduit according to claim 1, wherein the peripheral skew in which the conductors are located about the duct is an undulating lay about the duct.
Claim 4
Dependent Claim
20 words
A conduit according to claim 2, which further comprises: an insulating film interposed between the conductors and the flexible tube.
Claim 5
Dependent Claim
29 words
A conduit according to claim 3, wherein the flexible tube comprises a circumferentially corrugated metal sleeve and a polyethylene outer jacket securely bonded to the outside of the sleeve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |