US3256377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion of thermoplastic tubes
Assignee: Crown Packaging UK Ltd
•
Filing: 1964-09-02
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Granted: 1966-06-14
•
Expires: 1984-09-02
Abstract
No abstract record available.
Inventors
- 👤 Adams John Francis Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:29
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/02; B29C49/04; B29C49/04102; B29C48/00; B29C48/03; B29C48/09; B29C48/25; B29C48/30; B29C48/32; B29C48/325; B29C48/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A METHOD OF EXTRUDING A PARISON, WHOSE WEIGHT PER UNIT LENGTH, DIAMETER AND WALL THICKNESS VARY IN THE EXTRUSION DIRECTION, FOR SUBSEQUENT INFLATION IN A MOULD, COMPRISING THE STEPS OF CONTINUOUSLY EXTRUDING THERMOPLASTIC MATERIAL THROUGH AN ANNULAR DIE ORIFICE HAVING A CORE AT A CONSTANT RATE TO FORM A TUBE, AND APPLYING TO
Claim 2
Independent Claim
53 words
A METHOD OF EXTRUDING A PARISON, WHOSE WEIGHT PER UNIT LENGTH, DIAMETER AND WALL THICKNESS VARY IN THE EXTRUSION DIRECTION, FOR SUBSEQUENT INFLATION IN A MOULD, COMPRISING THE STEPS OF CONTINUOUSLY EXTRUDING THERMOPLASTIC MATERIAL THROUGH AN ANNULAR DIE ORIFICE HAVING A CORE AT A CONSTANT RATE TO FORM A TUBE, AND APPLYING TO
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |