Patent US3570294A successfully refreshed from Google Patents.
US3570294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe rolling equipment
Assignee: Individual
•
Filing: 1968-12-04
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Granted: 1971-03-16
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Expires: 1988-12-04
Abstract
Abstract A PIPE ROLLING MILL FOR SHRINKAGE OF A METALLIC RAW PIPE TO A REQUIRED EXTERNAL DIAMETER AND THICKNESS, WHEREIN A RAW PIPE, HAVING INSERTED THEREIN A CORE ROD OR MANDREL, IS PINCHED BETWEEN FACING ROLLERS. THE PIPE IS INITIALLY DEFORMED TO AN ECCENTRIC CROSS SECTION AND ROTATED THROUGH A CERTAIN ANGLE WHILE BEING PRESSED AND DRAWN BACKWARDS. THEN THE SAID PIPE IS REDUCED ALONG THE MANDREL SURFACE WHILE BEING DRAWN FORWARDS, AND ITS WORKED PORTION IS EXTRACTED FROM THE MANDREL AND PUSHED OUT BY A PRESSING UNIT, THE PIPE THUS GRADUALLY BEING ROLLED. THE OPERATION IS AUTOMATICALLY AND CONTINUOUSLY CARRIED OUT.
Inventors
- 👤 Jintaro Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:10
CPC Classifications
B; B21; B21B; B21B21/00; B21B21/005
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |