US3796781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion process
Assignee: BXL Plastics Ltd
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Filing: 1971-07-20
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Granted: 1974-03-12
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Expires: 1991-07-20
Abstract
Abstract A PROCESS FOR QUENCHING A CONTINUOUSLY EXTRUDED TUBE OF POLYMERIC MTERIAL IN WHICH THE TUBE IS QUENCHED EXTERNALLY IN A QUENCHING BATH AND IS SIMULTANEOUSLY QUENCHED INTERNALLY BY PASSING QUENCHING LIQUID INTO AND REMOVING IT FROM THE INTERIOR OF THE TUBE, THE TUBE PASSING D R A W I N G OVER AND THE INTERNAL QUENCHING LIQUID PASSING THROUGH AN ASSEMBLY OF TWO OR MORE CALIBRARTING DISCS.
Inventors
- 👤 W Edwards
- 👤 J Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:59
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/908; B29C48/03; B29C48/09; B29C48/10; B29C48/901; B29C48/902; B29C48/919; B29C48/001; B29C48/0018; B29C48/0019; Y; Y10; Y10S; Y10S264/00; Y10S264/78
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |