US3146284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making polypropylene film
Assignee: Hercules Powder Co
•
Filing: 1960-09-16
•
Granted: 1964-08-25
•
Expires: 1980-09-16
Abstract
No abstract record available.
Inventors
- 👤 Jr William H Markwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:06
CPC Classifications
B; B29; B29D; B29D7/00; B29D7/01; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/14; B29C55/143; C; C08; C08J; C08J5/00; C08J5/18; B29K; B29K2023/00; B29K2023/10; B29K2023/12; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE PROCESS FOR MAKING BIAXIALLY ORIENTED FILM OF STEREOREGULAR POLYPROPYLENE WHICH COMPRISES EXTRUDING A MOLTEN FILM OF SAID POLYMER THROUGH A DIE AT A TEMPERATURE BELOW ABOUT 290*C., PULLING SAID FILM AWAY FROM THE DIE AT A LINEAR SPEED AT LEAST ABOUT THREE TIMES THE RATE OF EXTRUSION AND QUENCHING SAID FILM TO A TEMPERATURE BELOW ABOUT 40*C. WITHIN A DISTANCE OF FROM 1/8 TO 3 INCHES FROM THE DIE WHEREBY THERE IS OBTAINED A FILM HAVING SUBSTANTIAL ORIENTATION IN THE LONGITUDINAL DIRECTION, REHEATING THE FILM TO A TEMPERATURE WITHIN THE RANGE OF ABOUT 95* TO 160*C., AND STRETCHING THE FILM TRANSVERSELY WHILE AT THE LATTER TEMPERATURE TO ORIENT THE FILM IN THE TRANSVERSE DIRECTION, THEREBY OBTAINING A BIAXIALLY ORIENTED FILM.
Claim 2
Dependent Claim
121 words
THE PROCESS FOR MAKING BIAXIALLY ORIENTED FILM OF STEREOREGULAR POLYPROPYLENE WHICH COMPRISES EXTRUDING A MOLTEN FILM OF SAID POLYMER THROUGH A DIE AT A TEMPERATURE BELOW ABOUT 290*C., PULLING SAID FILM AWAY FROM THE DIE AT A LINEAR SPEED AT LEAST ABOUT THREE TIMES THE RATE OF EXTRUSION AND QUENCHING SAID FILM TO A TEMPERATURE BELOW ABOUT 40*C. WITHIN A DISTANCE OF FROM 1/8 TO 3 INCHES FROM THE DIE WHEREBY THERE IS OBTAINED A FILM HAVING SUBSTANTIAL ORIENTATION IN THE LONGITUDINAL DIRECTION, REHEATING THE FILM TO A TEMPERATURE WITHIN THE RANGE OF ABOUT 95* TO 160*C., AND STRETCHING THE FILM TRANSVERSELY WHILE AT THE LATTER TEMPERATURE TO ORIENT THE FILM IN THE TRANSVERSE DIRECTION, THEREBY OBTAINING A BIAXIALLY ORIENTED FILM.
References Cited (Backward Citations)
BE581390A
Cited
CA627801A
Cited
US2364435A
Cited
US2627088A
Cited
US2668988A
Cited
US2799896A
Cited
US2824090A
Cited
US2961711A
Cited
US2979774A
Cited
GB849436A
Cited
GB840191A
Cited
FR1213605A
Cited
US3022543A
Cited
US2971222A
Cited
US3059991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-25 | 1968-02-24 | 1968-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-25 | 1972-02-24 | 1972-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-25 | 1976-02-24 | 1976-08-25 | $7700.00 | Window Closed / Lapsed |