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| US4250129 | 13. März 1978 | 10. Febr. 1981 | Maryland Cup Corporation | Method for the continuous formation of biaxially oriented thermoplastic materials and forming articles therefrom in a continuous process |
| US4288400 | 13. März 1978 | 8. Sept. 1981 | Maryland Cup Corporation | Method for the continuous formation of biaxially oriented thermoplastic materials and forming articles therefrom by intermittent forming means interfaced therewith |
| US4384836 | 29. Mai 1980 | 24. Mai 1983 | Maryland Cup Corporation | Apparatus for the continuous formation of biaxially oriented thermoplastic materials and forming articles therefrom by intermittent formings means interfaced therewith |
