US3784667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing pipes
Assignee: Individual
•
Filing: 1972-03-22
•
Granted: 1974-01-08
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Expires: 1992-03-22
Abstract
Abstract The method and apparatus provide for production of pipe lengths having bell and spigot ends adapted to cooperate with each other serially in laying pipeline. The technique provides for continuous production of pipe, with bell portions spaced at intervals, the bell portions being divided or severed in order to provide a bell end on the adjacent ends of the pipe lengths by the division. At points intermediate to the bell portions the pipe is also divided or severed in order to provide pipe lengths having spigot ends at one end and bell ends at the other end.
Inventors
- 👤 F Drostholm
- 👤 L Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:23
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/74
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |