Patent US3221371A successfully refreshed from Google Patents.
US3221371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruding dies
Assignee: Individual
•
Filing: 1963-03-25
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Granted: 1965-12-07
•
Expires: 1983-03-25
Abstract
No abstract record available.
Inventors
- 👤 Stevens Alexander Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:55
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/325; B29C48/327; B29C48/03; B29C48/09; Y; Y10; Y10S; Y10S264/00; Y10S264/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
AN EXTRUDER DIE STRUCTURE FOR USE IN THE EXTRUSION OF TUBULAR PARASINS OF PLASTIC MATERIAL COMPRISING, IN COMBINATION, A HOLLOW BODY HAVING AN INLET AND AN OUTLET FOR FLOW OF PLASTIC MATERIAL THROUGH THE BODY UNDER PRESSURE, A FIRST TUBULAR PARASIN EXTRUDER SHELL HAVING A BORE IN FIXED RELATION TO AND COMMUNICATING WITH THE OUTLET AND OF A CROSS-SECTIONAL SHAPE TO SUIT THE CROSS-SECTIONAL SHAPE OF THE PARASINS TO BE EXTRUDED THROUGH SAID BORE, A CORE OF COMPLEMENTARY CROSS-SECTIONAL SHAPE DISPOSED IN FIXED CENTERED RELATION TO THE OUTLET END OF THE BORE OF SAID SHELL TO DEFINE AN ANNULAR ORIFICE OF A PREDETERMINED WIDTH FOR EXTRUSION OF A PARASIN OF A PREDETERMINED WALL THICKNESS, A SECOND TUBULAR PARASINS EXTRUDER SHELL HAVING A BORE
Claim 2
Dependent Claim
123 words
AN EXTRUDER DIE STRUCTURE FOR USE IN THE EXTRUSION OF TUBULAR PARASINS OF PLASTIC MATERIAL COMPRISING, IN COMBINATION, A HOLLOW BODY HAVING AN INLET AND AN OUTLET FOR FLOW OF PLASTIC MATERIAL THROUGH THE BODY UNDER PRESSURE, A FIRST TUBULAR PARASIN EXTRUDER SHELL HAVING A BORE IN FIXED RELATION TO AND COMMUNICATING WITH THE OUTLET AND OF A CROSS-SECTIONAL SHAPE TO SUIT THE CROSS-SECTIONAL SHAPE OF THE PARASINS TO BE EXTRUDED THROUGH SAID BORE, A CORE OF COMPLEMENTARY CROSS-SECTIONAL SHAPE DISPOSED IN FIXED CENTERED RELATION TO THE OUTLET END OF THE BORE OF SAID SHELL TO DEFINE AN ANNULAR ORIFICE OF A PREDETERMINED WIDTH FOR EXTRUSION OF A PARASIN OF A PREDETERMINED WALL THICKNESS, A SECOND TUBULAR PARASINS EXTRUDER SHELL HAVING A BORE
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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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |