Patent US3613162A successfully refreshed from Google Patents.
US3613162A
Expired / Lapsed
US
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Apparatus for the formation of helical plastic pipe
Assignee: Standard Oil Co
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Filing: 1970-03-10
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Granted: 1971-10-19
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Expires: 1990-03-10
Abstract
Abstract PLASTIC RESIN IS EXTRUDED OVER A ROTATABLE COOLING MANDREL IN A DIE ASSEMBLY WHICH IS DISPOSED UPON THE BARREL OF AN EXTRUDER. A ROTATABLE DIE BUSHING EMBRACES THE END OF THE MANDREL; WHEN THE DIE BUSHING IS ROTATED IN UNISON WITH THE MANDREL IN A DIRECTION COUNTER TO THAT IMPARTED THE EXTRUDATE BY THE HELIX, AND EXTRUDATE WITH NO NET ROTATION IS PRODUCED.
Inventors
- 👤 Herbert Talsma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:45
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/33; B29C48/03; B29C48/09; B29C48/131; B29C48/12; B29C48/13
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |