Patent US1990503A successfully refreshed from Google Patents.
US3681925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated arched drainage tile
Assignee: National City Bank
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Filing: 1969-08-07
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Granted: 1972-08-08
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Expires: 1989-08-07
Abstract
Abstract This drainage tile for the collection and disbursement of liquids is in the shape of an elongated tube made from a polymeric material such as polyethylene, polypropylene, etc. The tube has a slightly convex base in order to conform to the trench in which it rests. Sidewalls are connected to and arched upwardly and inwardly from the base to an apex where they join in a continuous curve. The sides and base are corrugated to provide greater resistance to compressive forces while permitting flexing and bending of the tube about its longitudinal axis.
Inventors
- 👤 John D Schmunk
- 👤 James L Child
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:45
CPC Classifications
E; E02; E02B; E02B11/00; E02B11/005
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
A drainage tile for collection and disbursement of liquids comprising: a seamless, elongated flexible tube of polymeric material; said tube having a relatively flat base on which it rests when placed in a trench; sides connecting to and arching upwardly from the base to an apex where they are joined; The sides and base having continuous circumferential corrugations to enhance resistance to compressive forces while permitting flexing and bending of the tube relative to its longitudinal axis, said corrugations comprising root sections and crest sections which are joined by wall sections, the depth of the corrugation in the sides being greater at the base than at the curved apex, and openings in the wall sections of the corrugations to permit ingress and egress of liquid.
Claim 2
Dependent Claim
125 words
A drainage tile for collection and disbursement of liquids comprising: a seamless, elongated flexible tube of polymeric material; said tube having a relatively flat base on which it rests when placed in a trench; sides connecting to and arching upwardly from the base to an apex where they are joined; The sides and base having continuous circumferential corrugations to enhance resistance to compressive forces while permitting flexing and bending of the tube relative to its longitudinal axis, said corrugations comprising root sections and crest sections which are joined by wall sections, the depth of the corrugation in the sides being greater at the base than at the curved apex, and openings in the wall sections of the corrugations to permit ingress and egress of liquid.
Claim 3
Dependent Claim
41 words
The drainage tile of claim 1 wherein the base is connected to the lower end of the sides to form a corner having a small radius of curvature relative to the radius of the curvature of the arc at its apex.
Claim 4
Dependent Claim
18 words
The drainage tile of claim 1 wherein the polymeric material from which the tube is formed is polyethylene.
Claim 5
Dependent Claim
19 words
The drainage tile of claim 1 wherein the polymeric material from which the tube is formed is polyvinyl chloride.
Claim 6
Dependent Claim
24 words
The drainage tile of claim 1 wherein the base is slightly convex to fit the curvature of the trench in which it is placed.
Claim 7
Dependent Claim
27 words
The drainage tile of claim 1 wherein the cross-sectional area of the crest of the corrugations are approximately equal to the cross-sectional area of the roots thereof.
Claim 8
Dependent Claim
14 words
The drainage tile of claim 1 wherein the relatively flat bottom is slightly convex.
Claim 9
Dependent Claim
98 words
A drainage tile for collection and disbursement of liquids comprising: an elongated tube of polymeric material; said tube having a relatively flat base on which it rests when placed in a trench; sides connecting to and arching upwardly from the base to an apex where they join in a continuous curve; the sides and base having corrugations to enhance resistance to compressive forces while permitting flexing and bending of the tube, openings in said tube to permit ingress of liquid, the depth of the corrugations on the sides being greater at the base than at the curved apex.
Claim 10
Dependent Claim
98 words
A drainage tile for collection and disbursement of liquids comprising: an elongated tube of polymeric material; said tube having a relatively flat base on which it rests when placed in a trench; sides connecting to and arching upwardly from the base to an apex where they join in a continuous curve; the sides and base having corrugations to enhance resistance to compressive forces while permitting flexing and bending of the tube, openings in said tube to permit ingress of liquid, the depth of the corrugations on the sides being greater at the base than at the curved apex.
Claim 11
Dependent Claim
29 words
The drainage tile of claim 8 wherein the depth of the corrugations at the center of the relatively flat bottom is greater than at the juncture with the sides.
Claim 12
Dependent Claim
17 words
The drainage tile of claim 8 wherein the openings are in the side walls of the corrugations.
Claim 13
Dependent Claim
41 words
The drainage tile of claim 8 wherein the base is connected to the lower end of the sides to form a corner having a small radius of curvature relative to the radius of the curvature of the arc at its apex.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |