Die for extruding thermoplastic sheets
Patent 3994654 Issued on November 30, 1976. Estimated Expiration Date: 
November 30, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 30, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1859416 2489951 2713313 3461496 InventorApplicationNo. 537975 filed on 01/02/1975US Classes:425/382.4, Including restriction upstream of shaping orifice and downstream of primary pressurizing means264/176.1, Shaping by extrusion264/177.1, To produce particular cross section (e.g., noncircular, etc.)425/461, MEANS PROVIDING A SHAPING ORIFICE65/183EXTRUSION DIE FORMER WITH UPSTREAM DISCHARGE ASSISTANTExaminersPrimary: Husar, Francis S.Assistant: Rosenbaum, Mark Attorney, Agent or FirmAbstractThe present invention relates to an improvement in a die for extruding thermoplastic sheet having a controlled degree of microsurface roughness. The improvement comprises having a beveled leading edge on at least one of the die lips wherein the bevel is away from the die orifice in order to control the degree of microsurface roughness in the extruded sheet. | |
