Patent US3855799A successfully refreshed from Google Patents.
US3855799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid corrugated tubing
Assignee: Advanced Drainage Systems Inc
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Filing: 1973-01-17
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Granted: 1974-12-24
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Expires: 1993-01-17
Abstract
Abstract Longitudinally oriented rigid corrugated tube comprises alternating peak walls and valley walls with interconnecting walls extending between peak and valley walls. Selected openings are provided in tube. Stiffening rib structure is associated with at least some of tube walls for preventing flexing of tube. Stiffening rib structure includes internally and externally disposed ribs.
Inventors
- 👤 L Martin
- 👤 R Martin
- 👤 M Sixt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:03
CPC Classifications
E; E03; E03F; E03F1/00; E03F1/002; E02; E02B; E02B11/00; E02B11/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A longitudinally oriented rigid corrugated tube comprising alternating substantially flat peak and flat valley walls with steep interconnecting walls extending between the peak and valley walls, and stiffening rib structure connected between at least some of the valley and interconnecting walls, one form of the rib structure extending to the flat peak walls and between adjacent interconnecting walls across the valley wall therebetween for preventing flexing of the tube, and another form of the stiffening rib structure including a plurality of individual external ribs in the form of buttresses spaced from one another, each of the buttresses connected between a valley wall and one of the interconnecting walls adjacent thereto and extending up to the flat peak wall.
Claim 2
Dependent Claim
118 words
A longitudinally oriented rigid corrugated tube comprising alternating substantially flat peak and flat valley walls with steep interconnecting walls extending between the peak and valley walls, and stiffening rib structure connected between at least some of the valley and interconnecting walls, one form of the rib structure extending to the flat peak walls and between adjacent interconnecting walls across the valley wall therebetween for preventing flexing of the tube, and another form of the stiffening rib structure including a plurality of individual external ribs in the form of buttresses spaced from one another, each of the buttresses connected between a valley wall and one of the interconnecting walls adjacent thereto and extending up to the flat peak wall.
Claim 3
Dependent Claim
27 words
A longitudinally oriented rigid corrugated tube as in claim 1 including a plurality of openings in the tube for providing communication between inside and outside the tube.
Claim 4
Dependent Claim
56 words
A longitudinally oriented rigid corrugated tube as in claim 1 wherein each of the rib structures between adjacent interconnecting walls across the valley wall therebetween extends inwardly from the interconnecting walls toward the longitudinal axis of the corrugated tube whereby the mid-portion of each such rib is closer to the longitudinal axis than the extremities thereof.
Claim 5
Dependent Claim
27 words
A longitudinally oriented rigid corrugated tube as in claim 1 wherein each of the individual buttresses is radially disposed relative to the longitudinal axis of the tube.
Claim 6
Dependent Claim
51 words
A longitudinally oriented rigid corrugated tube as in claim 4 wherein a portion of the individual buttresses extend between a valley wall and one of the interconnecting walls adjacent thereto while another portion of the individual buttresses extend between that valley wall and the other of the interconnecting walls adjacent thereto.
Claim 7
Dependent Claim
23 words
A longitudinally oriented rigid corrugated tube as in claim 5 wherein each valley wall has buttresses extending therefrom to the adjacent interconnecting walls.
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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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |