Thermoplastic sheet forming machine
Abstract
Abstract A THERMOPLASTIC SHEET MOLDING MACHINE IS PROVIDED COMPRISING A PERFORATED TOP TABLE SUPPORTING A MOLDING PATTERN, THE INTERIOR OF THE TABLE BEING SUBJECTED SELECTIVELY AND ALTERNATIVELY TO VACUUM AND PRESSURED AIR CONDITIOIN. A PLASTIC SHEET TRANSPORT FRAME IS PROVIDED INCLUDING MEANS FOR GRIPPING OPPOSITE SIDE EDGES OF A STOCK SHEET TO BE MOLDED AND HOLDING IT IN HORIZONTAL ATTITUDE ABOVE THE TABLE. A RADIANT HEATER IS MOUNTED ABOVE THE TRANSPORT FRAME, AND THE POWER SUPPLY MEANS IS SEPARATELY OPERABLE TO MOVE THE TRANSPORT FRAME AND HEATER VERTICALLY ON THE MACHINE RELATIVE TO THE TABLE. A VACUUM SOURCE AND A COOLING AIR SUPPLY ARE SELECTIVELY OPERABLE THROUGH THE TABLE AND ACT UPON THE SHEET IN PROCESS TO PROVIDE AN IMPROVED THERMOPLASTIC SHEET MOLDING OPERATION.
Inventors
- 👤 David W Birch
Bibliographic Details
Claims Analysis
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |