US3594461A
Expired / Lapsed
US
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Method and apparatus for continuously molding sheets from expandable polymeric materials
Assignee: WR Grace and Co
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Filing: 1969-01-21
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Granted: 1971-07-20
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Expires: 1989-01-21
Abstract
Abstract AN APPARATUS AND METHOD FOR CONTINUOUS MOLDING OF HEAT EXPANDABLE THERMOPLASTIC GRANULES INTO AN AGGLUTINATED BODY INCLUDING AN OPEN-ENDED MOLDING CHANNEL WHICH HAS ONLY A SINGLE MOVING SURFACE FOR CONVEYING THE AGGLUTINATED CONTINUOUS BODY FORMED AFTER THE APPLICATION OF HEAT TO THE GRANULES. THE SINGLE MOVING SURFACE IS PREFERABLY A WOVEN WIRE BELT OR EQUIVALENT WHICH IS FORAMINOUS OVER ITS ENTIRE WIDTH. THE APPARATUS ALSO INCLUDES A MEANS FOR ADJUSTING THE HEIGHT OF THE MOLDING CHANNEL WHILE THE MACHINE IS IN OPERATION. MEANS ARE PROVIDED FOR EVACUATING FEED AIR OR HEATING FLUID FROM THE MOLDING CHANNEL BETWEEN FEEDING AND HEATING OF THE GRANULES.
Inventors
- 👤 Francis J Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:31
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/467; B29C44/20; B29C44/206; Y; Y10; Y10S; Y10S264/00; Y10S264/10; Y10S425/00; Y10S425/06
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |