US4245697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular body
Assignee: Individual
•
Filing: 1979-11-14
•
Granted: 1981-01-20
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Expires: 1999-11-14
Abstract
Abstract A tubular body on whose external surface are formed a series of periodically wavy recesses of specific depth and angle, said recesses becoming the corresponding series of similarly wavy projections and thereby improving the mixed state or heat conduction efficiency of a fluid flowing therein.
Inventors
- 👤 Akira Togashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:36
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/42; F28F1/424; F28F1/426; Y; Y10; Y10S; Y10S165/00; Y10S165/532; Y10S165/535
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
136 words
A tubular body comprising: a series of periodically wavy recessed ribs formed on the external surface of the tubular body, said recessed ribs having a specific depth and a specific angle and a specific wave form about a base line at a center of the wave form, plural base lines being formed as rings at a specific angle to a plane perpendicular to a longitudinal axis of the tubular body; and a corresponding series of projecting ribs having the same specific wave form about the same base line formed on the internal surface of the tubular body, the specific wave form being selected from a group of wave forms consisting of a sinusoid wave form, a saw tooth wave form, a wave form made on continuously connected alternating opposite semicircular curves, and a rectangular wave form.
Claim 2
Dependent Claim
136 words
A tubular body comprising: a series of periodically wavy recessed ribs formed on the external surface of the tubular body, said recessed ribs having a specific depth and a specific angle and a specific wave form about a base line at a center of the wave form, plural base lines being formed as rings at a specific angle to a plane perpendicular to a longitudinal axis of the tubular body; and a corresponding series of projecting ribs having the same specific wave form about the same base line formed on the internal surface of the tubular body, the specific wave form being selected from a group of wave forms consisting of a sinusoid wave form, a saw tooth wave form, a wave form made on continuously connected alternating opposite semicircular curves, and a rectangular wave form.
Claim 3
Dependent Claim
29 words
A tubular body of claim 1, wherein the base line of said recessed ribs and projecting ribs are, most desirably, spirally set in the range of lead angles 1°˜30°.
Claim 4
Dependent Claim
20 words
A tubular body of claim 1, wherein the depth of said recessed ribs is most desirably set at 0.5˜5 mm.
Claim 5
Dependent Claim
22 words
A tubular body of claim 1, wherein said recessed rib is formed as an alternate continuation of circular part and straight part.
Claim 6
Dependent Claim
23 words
A tubular body of claim 4, wherein the period of the waveform of said recessed ribs is most desirably set at 3.5˜50 mm.
Claim 7
Dependent Claim
29 words
A tubular body of claim 4, wherein the angle of intersection between the base line of said recessed rib and said straight part is most desirably set at 5°˜60°.
Claim 8
Dependent Claim
17 words
A tubular body of claim 1, wherein said recessed rib is a sine wave of Sin β.
Claim 9
Dependent Claim
17 words
A tubular body of claim 1, wherein the value of β is most desirably set at 5°˜60°.
Claim 10
Dependent Claim
17 words
A tubular body of claim 1, wherein said recessed rib is a cosine wave of Cos β.
Claim 11
Dependent Claim
17 words
A tubular body of claim 9, wherein the value of β is most desirably set at 5°˜60°.
Claim 12
Dependent Claim
14 words
A tubular body of claim 1, wherein said recessed rib is a saw-tooth wave.
Claim 13
Dependent Claim
20 words
A tubular body of claim 11, wherein the period of said saw-tooth wave is most desirably set at 3.5˜50 mm.
Claim 14
Dependent Claim
29 words
A tubular body of claim 11, wherein the angle of intersection between the base line of said recessed rib and said saw-tooth wave is most desirably set at 5°˜60°.
Claim 15
Dependent Claim
22 words
A tubular body of claim 1, wherein said recessed rib is formed as an alternate continuation of semi-circular part and its inversion.
Claim 16
Dependent Claim
23 words
A tubular body of claim 14, wherein the period of the waveform of said recessed rib is most desirably set at 3.5˜50 mm.
Claim 17
Dependent Claim
33 words
A tubular body of claim 14, wherein the angle between the base line of recessed rib and the transition line from said circular part to its inversion is most desirably set at 1°˜90°.
Claim 18
Dependent Claim
14 words
A tubular body of claim 1, wherein said recessed rib is a square wave.
Claim 19
Dependent Claim
20 words
A tubular body of claim 17, wherein the period of said square wave is most desirably set at 3.5˜50 mm.
Claim 20
Dependent Claim
28 words
A tubular body of claim 17, wherein the angle of intersection between the base line of recessed rib and said square wave is most desirably set at 1°˜90°.
Claim 21
Dependent Claim
26 words
A heat exchanger comprising a plurality of tubular bodies of claim 1 having aligned axes and adjacent ends, and having framework means holding the adjacent ends.
Claim 22
Dependent Claim
137 words
A tubular body comprising: a series of periodically wavy recessed ribs formed on the external surface of the tubular body, said recessed ribs having a specific depth and a specific angle and a specific wave form about a base line at a center of the wave form, the base line being of a ring fashion formed at a specific angle to a plane perpendicular to a longitudinal axis of the tubular body; and a corresponding series of projecting ribs having the same specific wave form about the same base line formed on the internal surface of the tubular body, the specific wave form being selected from a group of wave forms consisting of sinusoid wave form, a saw tooth wave form, a wave form made of continuously connected alternating opposite semicircular curves, and a rectangular wave form.
Claim 23
Dependent Claim
137 words
A tubular body comprising: a series of periodically wavy recessed ribs formed on the external surface of the tubular body, said recessed ribs having a specific depth and a specific angle and a specific wave form about a base line at a center of the wave form, the base line being of a ring fashion formed at a specific angle to a plane perpendicular to a longitudinal axis of the tubular body; and a corresponding series of projecting ribs having the same specific wave form about the same base line formed on the internal surface of the tubular body, the specific wave form being selected from a group of wave forms consisting of sinusoid wave form, a saw tooth wave form, a wave form made of continuously connected alternating opposite semicircular curves, and a rectangular wave form.
Claim 24
Dependent Claim
21 words
A tubular body of claim 21, wherein the basic line of recessed ribs and projecting ribs are of a ring fashion.
Claim 25
Dependent Claim
33 words
A tubular body of claim 22, wherein the ring fashion of said baseline is desirably cut at a specific angle 1°˜30° from a line perpendicular to the longitudinal axis of the tubular body.
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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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |