US3345447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming polypropylene film
Assignee: Hercules LLC
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Filing: 1964-07-08
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Granted: 1967-10-03
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Expires: 1984-07-08
Abstract
No abstract record available.
Inventors
- 👤 David E Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:59
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; B; B29; B29D; B29D7/00; B29D7/01; C08J; C08J5/00; C08J5/18; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR FORMING TRANSPARENT, SUBSTANTIALLY NONORIENTED FILM HAVING HIGH TENSILE STRENGTH AND HIGH STIFFNESS WHICH CONSISTS OF EXTRUDING A MOLTEN MASS OF A STEREOREGULAR POLYMER OF PROPYLENE THROUGH A FILM-FORMING DEVICE, RAPIDLY QUENCHING THE EXTRUDED FILM UNDER CONDITIONS WHICH INDUCE SAID POLYMER TO CRYSTALLIZE PREDOMINANTLY IN ITS HEXAGONAL FORM, AND THEREAFTER HEATING THE CRUDE, PHOSPHATE POWDER INTO GREEN PELLETS, DRYING, HARDENING AND BAKING THE PELLETS.
Claim 2
Dependent Claim
66 words
A PROCESS FOR FORMING TRANSPARENT, SUBSTANTIALLY NONORIENTED FILM HAVING HIGH TENSILE STRENGTH AND HIGH STIFFNESS WHICH CONSISTS OF EXTRUDING A MOLTEN MASS OF A STEREOREGULAR POLYMER OF PROPYLENE THROUGH A FILM-FORMING DEVICE, RAPIDLY QUENCHING THE EXTRUDED FILM UNDER CONDITIONS WHICH INDUCE SAID POLYMER TO CRYSTALLIZE PREDOMINANTLY IN ITS HEXAGONAL FORM, AND THEREAFTER HEATING THE CRUDE, PHOSPHATE POWDER INTO GREEN PELLETS, DRYING, HARDENING AND BAKING THE PELLETS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |