Patent US3961486A successfully refreshed from Google Patents.
US3961486A
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US
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Pipe for sticking down drains into the ground
Assignee: BURCAN INDUSTRIES Ltd SUITE 17 111 INDUSTRIAL DRIVE WHITBY ONTARIO L1N 5Z9 CANADA
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Filing: 1974-10-22
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Granted: 1976-06-08
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Expires: 1994-10-22
Abstract
Abstract A tube for sticking stripformed drains into the ground has a predetermined fixed profile of rhombic cross section made by pressing two opposite corners of a square tube towards each other.
Inventors
- 👤 Sven Granholm
- 👤 Signar Lundmark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:37
CPC Classifications
E; E02; E02D; E02D3/00; E02D3/02; E02D3/10; Y; Y10; Y10S; Y10S138/00; Y10S138/08; Y10S138/11
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
155 words
An elongated pipe adapted to be driven into the ground in the direction of its elongation for use in sticking drains down into the ground, said pipe having a predetermined, fixed cross-sectional profile of substantially parallelogram shape, two opposite corners of said parallelogram being substantially closer to one another than the other two opposite corners thereof, all sides of said parallelogram being integral with one another and the dimensions of said parallelogram being substantially constant throughout the length of said pipe, the parallelogram shape of said pipe causing said pipe to exhibit resistance to bending sufficient to permit said pipe to be driven into the ground and causing comparatively small disturbance of the ground as said pipe is driven into the ground, said pipe being used to protect a drain located therein, the spacing between the more widely spaced corners of said parallelogram being at least as great as the width of such a drain.
Claim 2
Dependent Claim
155 words
An elongated pipe adapted to be driven into the ground in the direction of its elongation for use in sticking drains down into the ground, said pipe having a predetermined, fixed cross-sectional profile of substantially parallelogram shape, two opposite corners of said parallelogram being substantially closer to one another than the other two opposite corners thereof, all sides of said parallelogram being integral with one another and the dimensions of said parallelogram being substantially constant throughout the length of said pipe, the parallelogram shape of said pipe causing said pipe to exhibit resistance to bending sufficient to permit said pipe to be driven into the ground and causing comparatively small disturbance of the ground as said pipe is driven into the ground, said pipe being used to protect a drain located therein, the spacing between the more widely spaced corners of said parallelogram being at least as great as the width of such a drain.
Claim 3
Dependent Claim
11 words
The pipe of claim 1 wherein said profile is substantially rhombic.
Claim 4
Dependent Claim
26 words
The pipe of claim 1 wherein the distance between said closer two opposite corners is substantially one half the distance between said other two opposite corners.
Claim 5
Dependent Claim
54 words
The pipe of claim 1 wherein the two sides of said parallelogram which adjoin one another at each of said closer two opposite corners include comparatively short portions at the very corner which are at a more acute angle to one another than the angle formed between the main portions of said two sides.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |