Patent US3217073A successfully refreshed from Google Patents.
US3217073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of biaxially oriented polypropylene film
Assignee: Eastman Kodak Co
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Filing: 1962-04-26
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Granted: 1965-11-09
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Expires: 1982-04-26
Abstract
No abstract record available.
Inventors
- 👤 James R Olson
- 👤 Edmond S Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:43
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/14; B29C55/146
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A PROCESS FOR PRODUCING BIAXIALLY ORIENTED NONTUBULAR, NON-IRRADIATED POLYPROPYLENE FILM WHICH COMPRISES (1) EXTRUDING POLYPROPYLENE AT A MELT TEMPERATURE IN A RANGE OF FROM 190*C. TO 230*C. TO PROVIDE A NONTUBULAR FILM, (2) QUENCHING THE EXTRUDED FILM TO A TEMPERATURE OF AT LEAST 56*C. BELOW ITS FROSTLINE TEMPERATURE WITHIN AT LEAST 60 SECONDS FROM THE TIME IT IS EXTRUDED, (3) HEATING THE QUENCHED, EXTRUDED FILM AT A SPECIFIC TEMPERATURE WITHIN THE RANGE OF 145*C. TO 175*C., (4) STRETCHING THE FILM WIDTHWISE 6 TO 8 TIMES ITS ORIGINAL WIDTH WHILE THE FILM IS GRADUALLY COOLED TO A TEMPERATURE OF 15*C. TO 20*C. BELOW THE SPECIFIC TEMPERATURE WITHIN THE RANGE OF 145*C. TO 175*C., AND IMMEDIATELY THEREAFTER STRETCHING THE FILM LENGTHWISE 4 TO 6 TIMES ITS ORIGINAL LENGTH.
Claim 2
Dependent Claim
126 words
A PROCESS FOR PRODUCING BIAXIALLY ORIENTED NONTUBULAR, NON-IRRADIATED POLYPROPYLENE FILM WHICH COMPRISES (1) EXTRUDING POLYPROPYLENE AT A MELT TEMPERATURE IN A RANGE OF FROM 190*C. TO 230*C. TO PROVIDE A NONTUBULAR FILM, (2) QUENCHING THE EXTRUDED FILM TO A TEMPERATURE OF AT LEAST 56*C. BELOW ITS FROSTLINE TEMPERATURE WITHIN AT LEAST 60 SECONDS FROM THE TIME IT IS EXTRUDED, (3) HEATING THE QUENCHED, EXTRUDED FILM AT A SPECIFIC TEMPERATURE WITHIN THE RANGE OF 145*C. TO 175*C., (4) STRETCHING THE FILM WIDTHWISE 6 TO 8 TIMES ITS ORIGINAL WIDTH WHILE THE FILM IS GRADUALLY COOLED TO A TEMPERATURE OF 15*C. TO 20*C. BELOW THE SPECIFIC TEMPERATURE WITHIN THE RANGE OF 145*C. TO 175*C., AND IMMEDIATELY THEREAFTER STRETCHING THE FILM LENGTHWISE 4 TO 6 TIMES ITS ORIGINAL LENGTH.
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |