Patent FR828262A successfully refreshed from Google Patents.
Patent US3976578A successfully refreshed from Google Patents.
US3976578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective sleeve for corrugated drainage tubes
Assignee: Individual
•
Filing: 1974-06-25
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Granted: 1976-08-24
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Expires: 1994-06-25
Abstract
Abstract A continuous tubular sleeve of knit fabric material, which is cylindrical in shape and, in the relaxed condition, of a diameter less than the diameter of the corrugated drainage pipe to which it is to be applied, is formed in lengths up to approximately 1,000 feet. In use, the tubular knit sleeve is cut to a desired length and slipped over one or more sections of corrugated flexible drainage pipe and acts as a filter to keep rocks, dirt, mud, pieces of clay, and the like from clogging the openings in the corrugated drainage pipe while allowing the water to pass through.
Inventors
- 👤 Frank T. Beane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:44
CPC Classifications
E; E02; E02B; E02B11/00; E02B11/005; Y; Y10; Y10S; Y10S285/00; Y10S285/903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
In combination with an elongated flexible corrugated drainage pipe capable of being rolled upon itself for storage and shipment and of the type having alternating peaks and valleys along its longitudinal axis and a plurality of openings through the pipe arranged along its longitudinal axis and located in selected valleys of the corrugated pipe, a protective permeable sleeve comprising a length of tubular knit fabric of lock-stitch construction substantially co-extensive with the length of the pipe and having a diameter in a relaxed condition less than the maximum diameter of the corrugated pipe, and said sleeve having an undulating surface when positioned on the corrugated pipe.
Claim 2
Dependent Claim
106 words
In combination with an elongated flexible corrugated drainage pipe capable of being rolled upon itself for storage and shipment and of the type having alternating peaks and valleys along its longitudinal axis and a plurality of openings through the pipe arranged along its longitudinal axis and located in selected valleys of the corrugated pipe, a protective permeable sleeve comprising a length of tubular knit fabric of lock-stitch construction substantially co-extensive with the length of the pipe and having a diameter in a relaxed condition less than the maximum diameter of the corrugated pipe, and said sleeve having an undulating surface when positioned on the corrugated pipe.
Claim 3
Dependent Claim
98 words
In combination with an elongated flexible tubular drainage pipe having corrugations therein forming alternating annular peaks and valleys along the longitudinal axis of the pipe and a plurality of openings through the pipe positioned in selected valleys, the combination of and a permeable tubular knit fabric sleeve surrounding said pipe and snugly engaging its peaks, said sleeve having a diameter in its relaxed condition less than the maximum diameter of the pipe, said sleeve presenting an undulating surface when positioned on the pipe, and including inward undulations corresponding with the valleys in the corrugated configuration of the pipe.
Claim 4
Dependent Claim
98 words
In combination with an elongated flexible tubular drainage pipe having corrugations therein forming alternating annular peaks and valleys along the longitudinal axis of the pipe and a plurality of openings through the pipe positioned in selected valleys, the combination of and a permeable tubular knit fabric sleeve surrounding said pipe and snugly engaging its peaks, said sleeve having a diameter in its relaxed condition less than the maximum diameter of the pipe, said sleeve presenting an undulating surface when positioned on the pipe, and including inward undulations corresponding with the valleys in the corrugated configuration of the pipe.
Claim 5
Dependent Claim
20 words
A structure according to claim 2 wherein the sleeve on the pipe extends inwardly toward the openings in the pipe.
References Cited (Backward Citations)
GB703595A
Cited
US2763991A
Cited
US3302408A
Cited
US3556299A
Cited
US3611735A
Cited
US3830373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |