US3747646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulation of gas feed tubes
Assignee: European Atomic Energy Community Euratom
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Filing: 1971-03-29
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Granted: 1973-07-24
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Expires: 1991-03-29
Abstract
Abstract A heat insulation system for gas conduits in which open cylinders are placed side by side coaxially within the conduit. Each cylinder has an inner and outer wall, the gap between the walls being occupied by concentric metal layers which are so shaped and stacked that a number of longitudinal gaps are provided between any two metal layers. The gap is closed either at the upstream end of the cylinder or in the central zone.
Inventors
- 👤 Casali F Farfaletti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:28
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/147; G; G21; G21C; G21C11/00; G21C11/08; G21C11/083; G21C11/085; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
A heat insulation system for gas conduits having first and second conduits wherein the first conduit, through which gas flows at elevated temperatures and pressures, is positioned within and substantially coaxial with the second conduit, said first conduit comprising a plurality of aligned axially spaced of inner conduits, each having an inner and an outer wall; longitudinal cells, positioned between the inner and outer walls of said inner conduit providing a plurality of longitudinal passages said the longitudinal cells being open at one end to the gas flow in the inner conduit; and means for preventing the free flow of gas through the longitudinal passages from a position exterior of one end of the passages to a position exterior of the other end of the passages.
Claim 2
Dependent Claim
126 words
A heat insulation system for gas conduits having first and second conduits wherein the first conduit, through which gas flows at elevated temperatures and pressures, is positioned within and substantially coaxial with the second conduit, said first conduit comprising a plurality of aligned axially spaced of inner conduits, each having an inner and an outer wall; longitudinal cells, positioned between the inner and outer walls of said inner conduit providing a plurality of longitudinal passages said the longitudinal cells being open at one end to the gas flow in the inner conduit; and means for preventing the free flow of gas through the longitudinal passages from a position exterior of one end of the passages to a position exterior of the other end of the passages.
Claim 3
Dependent Claim
20 words
A system as claimed in claim 1, wherein the first and second conduits are pipes having a substantially circular cross-section.
Claim 4
Dependent Claim
14 words
A system as claimed in claim 1, wherein the inner conduits are spaced apart.
Claim 5
Dependent Claim
17 words
A system as claimed in claim 1, wherein said inner conduits are welded to said second conduit.
Claim 6
Dependent Claim
29 words
A system as claimed in claim 1, wherein the cells between said inner and outer walls are provided by concentric layers of metal sheeting formed into a honeycomb structure.
Claim 7
Dependent Claim
37 words
A system as claimed in claim 1, Wherein the cells between said inner and outer walls are provided by concentric layers of metal sheeting welded along the lines of contact so as to bound longitudinal honeycomb spaces.
Claim 8
Dependent Claim
41 words
A system as claimed in claim 1, wherein the cells between said inner and outer walls are provided by concentric layers of metal sheeting formed into a honeycomb structure, said longitudinal passages having a circumferential length greater than a radial length.
Claim 9
Dependent Claim
23 words
A system as claimed in claim 1, wherein the cells are provided by metal elements having a thickness of 0.1 to 0.2 mm.
Claim 10
Dependent Claim
32 words
A system as claimed in claim 1, wherein said means for preventing flow comprises a single closure member extending across said passages and situated at the upstream end of said inner conduit.
Claim 11
Dependent Claim
33 words
A system as claimed in claim 1, wherein said means for preventing flow comprises a single circular ring in the central zone of said inner conduit between said inter and outer walls thereof.
Claim 12
Dependent Claim
61 words
A system as claimed in claim 1, wherein: a. the first and second conduits are pipes having a substantially circular cross-section; b. said inner conduits are spaced apart; c. said inner conduits are welded to said second conduit; and d. said cells between said inner and outer walls are provided by concentric layers of metal sheeting formed into a honeycomb structure.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |