Patent US3854292A successfully refreshed from Google Patents.
US3854292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Irrigation ditch liner and method for making same
Assignee: Individual
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Filing: 1971-09-30
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Granted: 1974-12-17
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Expires: 1991-09-30
Abstract
Abstract A liner is provided for irrigation ditches or the like. The liner is prefabricated in sections many feet long of glass fiber reinforced plastic resin. A section of glass fiber on the order of four to 6 inches long at each end of each prefabricated section is left free of resin. The non-resin covered fiberglass ends are overlapped and coated with resin as the liner sections are applied in the ditch, thereby providing a continuous reinforced liner for the ditch.
Inventors
- 👤 H Nienstadt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:07
CPC Classifications
E; E02; E02B; E02B5/00; E02B5/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A liner for use in a channel such as an irrigation ditch comprising a plurality of prefabricated sections laid end to end in a channel conformably supporting the same, each of said sections being formed of fiber reinforced plastic resin of predetermined characteristics and being concave upwards, each section having fibers initially extending from the opposite ends thereof with the extending fibers of successive sections in overlapping relation providing a double layer of fibers, and plastic resin of said predetermined characteristics cured to set in place over said overlapping fibers and thus forming with the compatible plastic resin of adjacent sections a continuous integral liner with reinforced integral areas between adjacent sections; certain spaced sections along the length of the liner being of a plastic resin oF different characteristics rendering the same flexible as compared to remaining sections for accommodating shifting of the said remaining sections.
Claim 2
Dependent Claim
146 words
A liner for use in a channel such as an irrigation ditch comprising a plurality of prefabricated sections laid end to end in a channel conformably supporting the same, each of said sections being formed of fiber reinforced plastic resin of predetermined characteristics and being concave upwards, each section having fibers initially extending from the opposite ends thereof with the extending fibers of successive sections in overlapping relation providing a double layer of fibers, and plastic resin of said predetermined characteristics cured to set in place over said overlapping fibers and thus forming with the compatible plastic resin of adjacent sections a continuous integral liner with reinforced integral areas between adjacent sections; certain spaced sections along the length of the liner being of a plastic resin oF different characteristics rendering the same flexible as compared to remaining sections for accommodating shifting of the said remaining sections.
Claim 3
Dependent Claim
36 words
A liner as set forth in claim 1, wherein the said spaced sections have portions thereof extending at least to one side of the normal longitudinal disposition thereof for accommodating shifting of the said remaining sections.
Claim 4
Dependent Claim
16 words
A liner as claimed in claim 1, wherein the said spaced sections include accordion pleat portions.
Claim 5
Independent Claim
125 words
The method of forming a channel liner such as for an irrigation ditch which comprises laying successive liner sections in a channel for conformable support thereby, each section comprising a fiber reinforced plastic resin initially formed with bare fibers extending from opposite ends thereof, overlapping the confronting bare fibers of successive sections to provide a double layer of fibers between adjacent sections, applying plastic resin to the overlapping fibers between adjacent sections, and curing the applied plastic resin to set up as integral reinforced areas between adjacent sections, and with at least one section along the length of the liner being 1 a plastic resin of different characteristics rendering the same flexible as compared to remaining sections for accommodating shifting of the said remaining sections.
Claim 6
Independent Claim
125 words
The method of forming a channel liner such as for an irrigation ditch which comprises laying successive liner sections in a channel for conformable support thereby, each section comprising a fiber reinforced plastic resin initially formed with bare fibers extending from opposite ends thereof, overlapping the confronting bare fibers of successive sections to provide a double layer of fibers between adjacent sections, applying plastic resin to the overlapping fibers between adjacent sections, and curing the applied plastic resin to set up as integral reinforced areas between adjacent sections, and with at least one section along the length of the liner being 1 a plastic resin of different characteristics rendering the same flexible as compared to remaining sections for accommodating shifting of the said remaining sections.
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |