US3825645A
Expired / Lapsed
US
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Extrusion method and apparatus
Assignee: Tri-Cology Inc
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Filing: 1972-05-10
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Granted: 1974-07-23
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Expires: 1992-05-10
Abstract
Abstract A method and apparatus for extruding thermoplastic material containing a substantial quantity of an inert substance. The material is directed through a multiplicity of diagonal channels in an extrusion head in accordance with a triangular distribution such that each particle of material travels a uniform distance in a uniform length of time. The forces acting on each particle at a given distance along its flow path are the same, and the material is subjected to compression as it moves through the head with the result that there is provided an extremely even distribution of the inert substance within the finished product.
Inventors
- 👤 A Fayet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:32
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/695; B29C48/70; B29C48/03; B29C48/06; B29C48/07; B29C48/08; B29C48/09; B29C48/30; B29C48/305; B29C48/12
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |