Patent US3820340A successfully refreshed from Google Patents.
US3820340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated plastic pipe and drainage system using the same
Assignee: Frankische Isolierrohr and Metallwaren Werke Gehrueder Kirchner
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Filing: 1972-07-18
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Granted: 1974-06-28
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Expires: 1992-07-18
Abstract
Abstract A corrugated synthetic plastic pipe is provided with alternate circumferential ridges and hollows. In the hollows the wall of the pipe is formed with apertures and some or all of the ridges are formed in their exterior side with a respective radially inwardly divergent depression, all such depressions being aligned in axial direction of the pipe. A system utilizing such a pipe is provided with a foil of synthetic plastic material on the upper side of which the pipe is deposited, whereas at the lower side of the foil there is provided a strand of material which is pushed with a surrounding portion of the foil into the respective depressions to be retained by snap action therein.
Inventors
- 👤 H Jenner
- 👤 G Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:00
CPC Classifications
E; E02; E02B; E02B11/00; E02B11/005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
101 words
As a novel article of manufacture, a pipe of synthetic plastic material for use in a liquid-conducting system, said pipe having a corrugated wall provided in axial direction with alternate circumferential ridges and hollows, said wall being provided in respective ones of said hollows with a pluralitY of apertures, at least some of said ridges having in the respective exterior sides thereof radially inwardly divergent depressions arranged spaced from each other and aligned in axial direction of said pipe, said depressions receiving with a snap action an elongated strand-shaped element which is to hold a foil in place adjacent said pipe.
Claim 2
Dependent Claim
101 words
As a novel article of manufacture, a pipe of synthetic plastic material for use in a liquid-conducting system, said pipe having a corrugated wall provided in axial direction with alternate circumferential ridges and hollows, said wall being provided in respective ones of said hollows with a pluralitY of apertures, at least some of said ridges having in the respective exterior sides thereof radially inwardly divergent depressions arranged spaced from each other and aligned in axial direction of said pipe, said depressions receiving with a snap action an elongated strand-shaped element which is to hold a foil in place adjacent said pipe.
Claim 3
Dependent Claim
24 words
An article of manufacture as defined in claim 1, wherein all of said ridges are each formed with a respective one of said depressions.
Claim 4
Dependent Claim
23 words
An article of manufacture as defined in claim 1, wherein the depth of said depressions corresponds substantially to the depth of said hollows.
Claim 5
Dependent Claim
17 words
An article of manufacture as defined in claim 1, wherein said synthetic plastic material is polyvinyl chloride.
Claim 6
Dependent Claim
106 words
In a drainage system, a combination comprising at least one pipe of synthetic plastic material having a corrugated wall provided in axial direction with alternate circumferential ridges and hollows, said wall being provided in respective ones of said hollows with a plurality of apertures, and at least some of said ridges each having a radially inwardly divergent depression formed in the exterior side thereof with all such depressions being aligned in axial direction of said pipe; a synthetic plastic foil beneath said pipe; and an elongated strand-shaped element provided on said foil extending along said pipe and being received with a snap action in said depressions.
Claim 7
Dependent Claim
106 words
In a drainage system, a combination comprising at least one pipe of synthetic plastic material having a corrugated wall provided in axial direction with alternate circumferential ridges and hollows, said wall being provided in respective ones of said hollows with a plurality of apertures, and at least some of said ridges each having a radially inwardly divergent depression formed in the exterior side thereof with all such depressions being aligned in axial direction of said pipe; a synthetic plastic foil beneath said pipe; and an elongated strand-shaped element provided on said foil extending along said pipe and being received with a snap action in said depressions.
Claim 8
Dependent Claim
47 words
A combination as defined in claim 5, said foil having one side facing toward and another side facing away from said pipe; and wherein said elongated element is located at said other side and is received in said depressions together with respective overlying portions of said foil.
Claim 9
Dependent Claim
34 words
A combination as defined in claim 5, wherein all of said ridges are each provided with one of said depressions, said elongated element being received with a snap action in all of said depressions.
Claim 10
Dependent Claim
21 words
A combination as defined in claim 5, wherein said depressions have a depth corresponding substantially to the depth of said hollows.
Claim 11
Dependent Claim
15 words
A combination as defined in claim 5, wherein said synthetic plastic material is polyvinyl chloride.
Claim 12
Dependent Claim
26 words
A combination as defined in claim 5, wherein the cross-sectional contour of said depressions, in direction transverse to the elongation of said pipe, is substantially trapezoidal.
Claim 13
Dependent Claim
96 words
In a liquid-conducting system, a combination comprising at least one pipe of synthetic plastic material having a corrugated wall provided in axial direction with alternate circumferential ridges and hollows, said wall being provided with a plurality of apertures, and at least some of said ridges each being formed with a radially inwardly divergent depression, with all such depressions being aligned in axial direction of said pipe; a synthetic plastic foil beneath said pipe; and an elongated strand-shaped element provided on said foil extending along said pipe and being received with a snap action in said depressions.
Claim 14
Dependent Claim
96 words
In a liquid-conducting system, a combination comprising at least one pipe of synthetic plastic material having a corrugated wall provided in axial direction with alternate circumferential ridges and hollows, said wall being provided with a plurality of apertures, and at least some of said ridges each being formed with a radially inwardly divergent depression, with all such depressions being aligned in axial direction of said pipe; a synthetic plastic foil beneath said pipe; and an elongated strand-shaped element provided on said foil extending along said pipe and being received with a snap action in said depressions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |