Patent US6131616A successfully refreshed from Google Patents.
US6131616A
Expired / Lapsed
US
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Corrugated synthetic resin pipe
Assignee: Totaku Industries Inc
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Filing: 1999-06-07
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Granted: 2000-10-17
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Expires: 2019-06-07
Abstract
Abstract A corrugated synthetic resin pipe comprises a pipe wall including sectionally rectangular wall portions and sectionally circular wall portions disposed alternately in a longitudinal direction of the pipe. Each of the sectionally circular wall portions has an annular projected portion disposed at a substantially center of the sectionally circular wall portion between adjacent sectionally rectangular wall portions in the longitudinal direction, to thereby prevent parallel layout or stack layout of pipes from being disturbed.
Inventors
- 👤 Yoshiaki Tatsuta
- 👤 Kazuya Yamashita
- 👤 Takeshi Mochizuki
- 👤 Kazumasa Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:31
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/02; F16L9/06; F16L11/00; F16L11/04; F16L11/11
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
72 words
A corrugated synthetic resin pipe comprising: a pipe wall including sectionally rectangular wall portions and sectionally circular wall portions disposed alternately in a longitudinal direction of the pipe, wherein each of said sectionally circular wall portions includes an annular protrusion which projects outward from said sectionally circular wall portions that is disposed substantially at a center of said sectionally circular wall portion between adjacent sectionally rectangular wall portions in the longitudinal direction.
Claim 2
Dependent Claim
72 words
A corrugated synthetic resin pipe comprising: a pipe wall including sectionally rectangular wall portions and sectionally circular wall portions disposed alternately in a longitudinal direction of the pipe, wherein each of said sectionally circular wall portions includes an annular protrusion which projects outward from said sectionally circular wall portions that is disposed substantially at a center of said sectionally circular wall portion between adjacent sectionally rectangular wall portions in the longitudinal direction.
Claim 3
Dependent Claim
22 words
The corrugated synthetic resin pipe according to claim 1, wherein said annular protrusion has a U-shaped cross-section taken along the longitudinal direction.
Claim 4
Dependent Claim
56 words
A corrugated synthetic resin pipe according to claim 2, wherein each of said sectionally circular wall portions further has an annular shaped cutting mark interposed between said annular protrusion and said sectionally rectangular wall portion, said annular shaped cutting mark being separated away from said annular projected portion by a predetermined distance in the longitudinal direction.
Claim 5
Dependent Claim
30 words
A corrugated synthetic resin pipe according to claim 3, wherein a pair of said annular cutting marks are formed between said adjacent sectionally rectangular wall portions in the longitudinal direction.
Claim 6
Dependent Claim
27 words
A corrugated synthetic resin pipe according to claim 3, wherein said annular shaped cutting mark comprises a tapered portion inclined relative to an axis of said pipe.
Claim 7
Dependent Claim
46 words
A corrugated synthetic resin pipe according to claim 1, wherein said annular protrusion has a length in the longitudinal direction which lies in a range from one third to one sixth as large as a length of said sectionally circular wall portion in the longitudinal direction.
Claim 8
Dependent Claim
27 words
A corrugated synthetic resin pipe according to claim 1, wherein a rectangular shape in a cross-section of each of said sectionally rectangular wall portions has rounded corners.
Claim 9
Dependent Claim
26 words
A corrugated synthetic resin pipe according to claim 1, wherein a rectangular shape in a cross-section of each of said sectionally rectangular wall portions is square.
Claim 10
Dependent Claim
40 words
A corrugated synthetic resin pipe according to claim 1, wherein a circular shape in cross-section of each of said said sectionally circular wall portions is selected from the group consisting of a circle, an ellipse, an oblong and an egg-shape.
Claim 11
Dependent Claim
23 words
A corrugated synthetic resin pipe according to claim 1, further comprising an arc groove positioned inside said annular protrusion in the longitudinal direction.
Claim 12
Dependent Claim
39 words
A corrugated synthetic resin pipe according to claim 1, further comprising inclined surfaces on opposite sides of said annular protrusion on the outside of said sectionally circular wall portion between adjacent sectionally rectangular wall portions in the longitudinal direction.
Claim 13
Dependent Claim
25 words
A corrugated synthetic resin pipe according to claim 11, wherein said inclined surfaces rise outward with slight slopes from opposite-sides of said annular projected portion.
Claim 14
Dependent Claim
32 words
A corrugated synthetic resin pipe according to claim 12, wherein said inclined surfaces are formed substantially in intermediate positions between said annular protrusion and side walls of two adjacent square wall portions.
Claim 15
Dependent Claim
32 words
A corrugated synthetic resin pipe according to claim 1, further comprising inwardly inclined portions formed substantially in intermediate positions between said annular protrusion and side walls of two adjacent square wall portions.
Claim 16
Dependent Claim
17 words
A corrugated synthetic resin pipe according to claim 14, wherein said inwardly inclined portions are diameter-reducing portions.
Claim 17
Dependent Claim
18 words
A corrugated synthetic resin pipe according to claim 14, further comprising cutting marks at said inwardly inclined portions.
Claim 18
Dependent Claim
15 words
A corrugated synthetic resin pipe according to claim 16, wherein said cutting marks are slits.
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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) | 2003-10-17 | 2004-04-17 | 2004-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-17 | 2008-04-17 | 2008-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-17 | 2012-04-17 | 2012-10-17 | $7700.00 | Window Closed / Lapsed |