Patent EP0525525A1 successfully refreshed from Google Patents.
US3214503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniaxial orientation of polypropylene film
Assignee: Hercules Powder Co
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Filing: 1962-09-28
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Granted: 1965-10-26
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Expires: 1982-09-28
Abstract
No abstract record available.
Inventors
- 👤 Jr William H Markwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:16
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/04; B29C55/06; B29K; B29K2023/00; B29K2023/10; B29K2023/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE PROCESS OF MAKING UNIAXIALLY ORIENTED FILM OF STEREOREGULAR POLYPROPYLENE WHICH COMPRISES EXTRUDING A FLAT FILM OF MOLTEN STEROREGULAR POLYPROPYLENE, QUENCHING THE MOLTEN FILM TO THE SOLID STATE, AND THEN DRAWING IT BETWEEN DIFFERENTIAL FEED AND DRAW ROLLS 2 TO 6 TIMES ITS ORIGINAL LENGTH AT A DRAW RATE OF AT LEAST ABOUT 75,000% PER MINUTE, SAID DRAW RATE, EXPRESSED IN PERCENT PER MINUTE, BEING CALCULATED ACCORDING TO THE EQUATION:
Claim 2
Dependent Claim
70 words
THE PROCESS OF MAKING UNIAXIALLY ORIENTED FILM OF STEREOREGULAR POLYPROPYLENE WHICH COMPRISES EXTRUDING A FLAT FILM OF MOLTEN STEROREGULAR POLYPROPYLENE, QUENCHING THE MOLTEN FILM TO THE SOLID STATE, AND THEN DRAWING IT BETWEEN DIFFERENTIAL FEED AND DRAW ROLLS 2 TO 6 TIMES ITS ORIGINAL LENGTH AT A DRAW RATE OF AT LEAST ABOUT 75,000% PER MINUTE, SAID DRAW RATE, EXPRESSED IN PERCENT PER MINUTE, BEING CALCULATED ACCORDING TO THE EQUATION:
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) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |