Patent US3685547A successfully refreshed from Google Patents.
US3685547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal configuration of pipes and pressure parts
Assignee: Combustion Engineering Inc
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Filing: 1970-04-28
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Granted: 1972-08-22
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Expires: 1990-04-28
Abstract
Abstract A metallic pressure part for containing a flowing fluid and offering protection from thermal shock due to temperature changes of the fluid. The inner surface comprises a plurality of lands and furrows with the lands not exceeding 1 1/2 inches in any direction. The furrows are one-eighth inch wide and three-eighths inch deep.
Inventors
- 👤 William H Tuppeny Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:05
CPC Classifications
F; F16; F16L; F16L59/00; F16K; F16K27/00; F16L41/00; F16L41/02; F16L41/021; F16L59/14; F16L59/147; F16L9/00; F16L9/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
117 words
Apparatus for conducting fluids subject to periodic temperature changes including a hollow, metallic body of a thickness imposing significant thermal gradients between its inner and outer surfaces upon the occurrence of a change in temperature in the conducted fluid, the improvement comprising an array of mutually intercepting furrows disposed throughout the inner surface of said body defining closely spaced lands, said inner surface being flat in axial section, said furrows being arranged such that an axial section taken through said inner surface has a castellated configuration in which each of said lands has at least three sides; and the maximum uninterrupted linear dimension measured along said inner surface between furrows is not greater than about 1.5 inches.
Claim 2
Dependent Claim
117 words
Apparatus for conducting fluids subject to periodic temperature changes including a hollow, metallic body of a thickness imposing significant thermal gradients between its inner and outer surfaces upon the occurrence of a change in temperature in the conducted fluid, the improvement comprising an array of mutually intercepting furrows disposed throughout the inner surface of said body defining closely spaced lands, said inner surface being flat in axial section, said furrows being arranged such that an axial section taken through said inner surface has a castellated configuration in which each of said lands has at least three sides; and the maximum uninterrupted linear dimension measured along said inner surface between furrows is not greater than about 1.5 inches.
Claim 3
Dependent Claim
19 words
An apparatus as in claim 1 wherein the maximum width of the furrows separating the lands is one-fourth inch.
Claim 4
Dependent Claim
19 words
An apparatus as in claim 1 wherein the radially inwardly facing surface of each land is rectangular in shape.
Claim 5
Dependent Claim
25 words
An apparatus as in claim 3 wherein the ratio of the major dimensions of the inwardly facing surface of each land does not exceed three.
Claim 6
Dependent Claim
18 words
An apparatus as in claim 1 wherein the depth of the furrows is approximately three-eighths of an inch.
Claim 7
Dependent Claim
24 words
An apparatus as in claim 1 wherein said lands are defined by machined furrows in the metal of the wall of the hollow body.
Claim 8
Dependent Claim
33 words
An apparatus as in claim 1 wherein said hollow body includes a layer of cladding material bonded to the interior surface thereof and wherein said land-defining furrows are disposed in said cladding material.
Claim 9
Dependent Claim
14 words
An apparatus as in claim 1 wherein the bottom of the furrows are rounded.
Claim 10
Dependent Claim
26 words
An apparatus as in claim 8 wherein the radius of the bottom of said furrows has a dimension at least one-half the width of the furrows.
Claim 11
Dependent Claim
18 words
An apparatus as in claim 3 wherein the depth of the furrows is approximately three-eighths of an inch.
Claim 12
Dependent Claim
14 words
An apparatus as in claim 10 wherein the bottom of the furrows are rounded.
Claim 13
Dependent Claim
26 words
An apparatus as in claim 11 wherein the radius of the bottom of said furrows has a dimension at least one-half the width of the furrows.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |