Patent US3562056A successfully refreshed from Google Patents.
US3562056A
Expired / Lapsed
US
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Method of producing a sewer pipe
Assignee: Thunder Enterprises Inc
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Filing: 1969-04-25
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Granted: 1971-02-09
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Expires: 1989-04-25
Abstract
Abstract THIS INVENTION DEALS WITH A METHOD OF CONTINUOUSLY FORMING A SEWER PIPE WITHIN A DITCH. THE METHOD COMPRISES THE FORMATION OF PLASTIC SHEETS TO CONFORM TO THE INNER CROSS-SECTIONAL CONFIGURATION OF THE PIPE, MOVING THE APPARATUS ALONG THE BOTTOM OF THE DITCH WHILE FEEDING THE SHEETS TRHOUGH THE APPARATUS INTO THE DITCH AND INTERCONNECTING SAID SHEETS. CONCRETE IS THEN POURED INTO THE DITCH ONTO THE SUCCESSIVELY CONNECTED SHEETS TO FORM THE PIPE WHILE THE APPARATUS IS VIBRATED.
Inventors
- 👤 William C Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:31
CPC Classifications
F; F16; F16L; F16L1/00; F16L1/024; F16L1/028; F16L1/038
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |