Thermo-formable plastic material for making semi-rigid plastic packages
Abstract
Abstract A NOVEL THERMO-FORMABLE PLASTIC MATERIAL CHARACTERIZED BY ITS ABILITY TO TAKE SHALLOW OR DEEP DRAWS AND BE SUBSTANTIALLY WRINKLE FREE AFTER BEING SUBJECTED TO HEAT FOR THE FORMING PROCESS, THE MATERIAL BEING A LAMINATE OF RIGID PLASTIC MATERIAL WITH AN ORIENTED THERMO-PLASTIC MATERIAL ADHERED THERETO, WHEREBY THE SHRINK ENERGY OF THE LATTER MATERIAL IS USED TO PREVENT WRINKLE FORMATION DURING THE HEATING OF THE LAMINATE PRELIMINARY TO FORMING, AND WHEREBY AFTER A PRODUCT HAS BEEN PLACED IN THE CUPSHAPED DEPRESSION FORMED BY THE DRAW, A COVER SHEET MAY BE SEALED TO THE FLANGES THEREOF TO PRODUCE A HERMETICALLY SEALED PACKAGE FREE OF WEAK SPOTS NORMALLY CAUSED BY WRINKLING OR BUCKING OF THE SHEET. THE INVENTION ALSO INCLUDES A NOVEL METHOD FOR MAKING SUCH PACKAGES.
Inventors
- 👤 James I Mergy
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |