Patent US3830290A successfully refreshed from Google Patents.
US3830290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer pipe with leakage indicator
Assignee: Wieland Werke AG
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Filing: 1972-03-30
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Granted: 1974-08-20
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Expires: 1992-03-30
Abstract
Abstract There are provided three concentric pipes two of which have arranged thereon a series of tapered projections which contact an adjacent pipe. Said projections thus provide means for heat transfer from one pipe to another while permitting leakage from either the innermost pipe or the outermost pipe to flow therethrough. Pressure sensitive means are provided in communication with the respective spaces thereby provided for providing a signal in the event of such leakage.
Inventors
- 👤 E Thamasett
- 👤 U Herzog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:30
CPC Classifications
F; F28; F28D; F28D7/00; F28F; F28F1/00; F28F1/003; G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2807; G01M3/283; G01M3/32; G01M3/3227; A; A61; A61B; A61B18/00; A61B2018/00982; F16; F16L; F16L2101/00; F16L2101/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
In a heat transfer pipe having leakage indicator means associated therewith comprising at least two concentric pipes between which a leaking medium can penetrate should one of said concentric pipes crack, the improvement comprising a plurality of closely spaced spacers on at least one of said pipes and engaging the other of said pipes, said spacers having one of a pyramid-and pyramid-frustum-shape so that the spacing between the top of each of said one of said pyramid-and said pyramid-frustum-shaped spacers defines a space for an effective system to indicate leakage, the heat in one pipe being transmitted to the next radially spaced pipe through said one of said pyramid-and said pyramid-frustum-shaped spacers.
Claim 2
Dependent Claim
112 words
In a heat transfer pipe having leakage indicator means associated therewith comprising at least two concentric pipes between which a leaking medium can penetrate should one of said concentric pipes crack, the improvement comprising a plurality of closely spaced spacers on at least one of said pipes and engaging the other of said pipes, said spacers having one of a pyramid-and pyramid-frustum-shape so that the spacing between the top of each of said one of said pyramid-and said pyramid-frustum-shaped spacers defines a space for an effective system to indicate leakage, the heat in one pipe being transmitted to the next radially spaced pipe through said one of said pyramid-and said pyramid-frustum-shaped spacers.
Claim 3
Dependent Claim
28 words
The improvement according to claim 1, wherein three concentric pipes are provided; and wherein the spacers are provided on the outer surfaces of the middle and innermost pipes.
Claim 4
Dependent Claim
18 words
The improvement according to claim 1, wherein the contact ratio is in the range of 1:4 to 2:4.
Claim 5
Dependent Claim
12 words
The improvement according to claim 1, wherein the contact ratio is 1:4.
Claim 6
Dependent Claim
12 words
The improvement according to claim 1, wherein the contact ratio is 2:4.
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |