US3587659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrapped tubular concrete pipe
Assignee: Hydro Conduit Corp
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Filing: 1968-01-08
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Granted: 1971-06-28
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Expires: 1988-01-08
Abstract
Abstract REINFORCED CONCRETE AND METHOD OF MAKING SAME INCLUSIVE OF HOLLOW CONCRETE BODY OF TUBULAR SHAPE HAVING BEVELED END AND REINFORCING MEMBER WRAPPED ON EXTERIOR SURFACE OF LENGTH OF CONCRETE BODY AT BEVELED END IN PROGRESSION OF WRAPS TO FORM CONTINUOUS HELICAL ASSEMBLY. REINFORCING ASSEMBLY UNDER LESSER TENSION ALONG SHORTER SIDE PORTION THAN LONGER SIDE PORTION TO PROVIDE MORE NEARLY EQUAL STRESS IN CONCRETE BODY. MEANS ASSOCIATED WITH CONCRETE BODY ONTO WHICH REINFORCING MEMBER IS WRAPPED FOR HOLDING REINFORCING MEMBER AGAINST CIRCUMFERENTIAL MOVEMENT TO MAINTAIN SAID PRESELECTED TENSION IN REINFORCING MEMBER.
Inventors
- 👤 Thomas K Breitfuss
- 👤 Floyd L Wallace
- 👤 Joseph P Zicaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:30
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/08; B; B28; B28B; B28B21/00; B28B21/56; B28B21/60; B28B21/62; B28B21/64; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49874
Claims Analysis
Total Claims: 0
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |