US3258516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polymeric film
Assignee: EIDP Inc
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Filing: 1961-09-28
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Granted: 1966-06-28
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Expires: 1981-09-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert Wickliffe Ewing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:50
CPC Classifications
B; B29; B29D; B29D7/00; B29D7/01; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/11; B29C49/00; B29C49/02; B29C49/04; B29C49/04102; B29C48/001; B29C48/0019; B29C48/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
IN THE MANUFACTURE OF POLYMERIC FILM COMPRISING, IN COMBINATION, THE STEPS OF CONTINUOUSLY FORMING A CONTINUOUS TUBING OF A SELF-SUPPORTING FILM OF POLYMERIC MATERIAL, SAID TUBING HAVING A CIRCULAR CROSS SECTION, AND CONTINUOUSLY CONVERTING SAID TUBING TO A DEFLATED FLATTENED CONDITION CONSISTING SOLELY OF TWO PLIES OF FILM OVER THE ENTIRE WIDTH OF THE FLATTENED TUBING; THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY CONVERTING THE TUBING FROM THE CIRCULAR CROSS SECTION TOAN ESSENTIALLY RECTANGULAR CROSS SECTION PRIOR TO CONVERTING SAID TUBING TO THE FLATTENED CONDITION, THE RECTANGULAR CROSS SECTION HAVING A LENGTH TO WIDTH RATIO WITHIN THE RANGE OF FROM ABOUT 1 TO 1 TO ABOUT 7 TO 2, THE PERIPHERY OF SAID RECTANGULAR CROSS SECTON BEING SUBSTANTIALLY EQUAL TO THAT OF SAID CIRCULAR CROSS SECTIO, THE LINE BISECTING SAID RECTANGULAR CROSS SECTION INTO TWO RECTANGLES HAVING CONTIGUOUS LONGER SIDES BEING PARALLEL TO THE LINE PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID TUBING AT WHICH LINE SAID TUBING ATTAINS A FLATTENED CONDITION.
Claim 2
Dependent Claim
160 words
IN THE MANUFACTURE OF POLYMERIC FILM COMPRISING, IN COMBINATION, THE STEPS OF CONTINUOUSLY FORMING A CONTINUOUS TUBING OF A SELF-SUPPORTING FILM OF POLYMERIC MATERIAL, SAID TUBING HAVING A CIRCULAR CROSS SECTION, AND CONTINUOUSLY CONVERTING SAID TUBING TO A DEFLATED FLATTENED CONDITION CONSISTING SOLELY OF TWO PLIES OF FILM OVER THE ENTIRE WIDTH OF THE FLATTENED TUBING; THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY CONVERTING THE TUBING FROM THE CIRCULAR CROSS SECTION TOAN ESSENTIALLY RECTANGULAR CROSS SECTION PRIOR TO CONVERTING SAID TUBING TO THE FLATTENED CONDITION, THE RECTANGULAR CROSS SECTION HAVING A LENGTH TO WIDTH RATIO WITHIN THE RANGE OF FROM ABOUT 1 TO 1 TO ABOUT 7 TO 2, THE PERIPHERY OF SAID RECTANGULAR CROSS SECTON BEING SUBSTANTIALLY EQUAL TO THAT OF SAID CIRCULAR CROSS SECTIO, THE LINE BISECTING SAID RECTANGULAR CROSS SECTION INTO TWO RECTANGLES HAVING CONTIGUOUS LONGER SIDES BEING PARALLEL TO THE LINE PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID TUBING AT WHICH LINE SAID TUBING ATTAINS A FLATTENED CONDITION.
Claim 3
Dependent Claim
167 words
IN APPARATUS FOR THE MANUFACTURE OF FILM COMPRISING, IN COMBINATION, MEANS FOR CONTINUOUSLY FORMING A CONTINUOUS TUBING OF A SELF-SUPPORTING FOLM OF POLYMERIC MATERIAL SAID TUBING HAVING A CIRCULAR CROSS SECTION, AND MEANS FOR CONTINUOUSLY CONVERTING SAID TUBING TO A DEFLATED FLATTENED CONDITION CONSISTING SOLELY OF TWO PLIES OF FILM OVER THE ENTIRE WIDTH OF SAID FLATTENED TUBING; THE IMPROVEMENT WHICH COMPRISES SHAPING MEANS ADAPTED TO CONTINUOUSLY CONVERT SAID TUBING FROM THE CIRCULAR CROSS SECTION TO AN ESSENTIALLY RECTANGULAR CROSS SECTION BEFORE SAID TUBING IS CONVERTED TO THE FLATTENED CONDITION, THE RECTANGULAR CROSS SECTION HAVING A LENGTH TO WIDTH RATIO WITHIN THE RANGE OF FROM ABOUT 1 TO 1 TO ABOUT 7 TO 2, THE PERIPHERY OF SAID RECTANGULAR CROSS SECTION BEING SUBSTANTIALLY EQUAL TO THAT OF SAID CIRCULAR CROSS SECTION, THE LINE BISECTING SIAD RECTANGULAR CROSS SECTION INTO TWO RECTANGLES HAVING CONTIGUOUS LONGER SIDES BEING PARALLEL TO THE LINE PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID TUBING AT WHICH LINE SAID TUBING ATTAINS A FLATTENED CONDITION.
Claim 4
Dependent Claim
167 words
IN APPARATUS FOR THE MANUFACTURE OF FILM COMPRISING, IN COMBINATION, MEANS FOR CONTINUOUSLY FORMING A CONTINUOUS TUBING OF A SELF-SUPPORTING FOLM OF POLYMERIC MATERIAL SAID TUBING HAVING A CIRCULAR CROSS SECTION, AND MEANS FOR CONTINUOUSLY CONVERTING SAID TUBING TO A DEFLATED FLATTENED CONDITION CONSISTING SOLELY OF TWO PLIES OF FILM OVER THE ENTIRE WIDTH OF SAID FLATTENED TUBING; THE IMPROVEMENT WHICH COMPRISES SHAPING MEANS ADAPTED TO CONTINUOUSLY CONVERT SAID TUBING FROM THE CIRCULAR CROSS SECTION TO AN ESSENTIALLY RECTANGULAR CROSS SECTION BEFORE SAID TUBING IS CONVERTED TO THE FLATTENED CONDITION, THE RECTANGULAR CROSS SECTION HAVING A LENGTH TO WIDTH RATIO WITHIN THE RANGE OF FROM ABOUT 1 TO 1 TO ABOUT 7 TO 2, THE PERIPHERY OF SAID RECTANGULAR CROSS SECTION BEING SUBSTANTIALLY EQUAL TO THAT OF SAID CIRCULAR CROSS SECTION, THE LINE BISECTING SIAD RECTANGULAR CROSS SECTION INTO TWO RECTANGLES HAVING CONTIGUOUS LONGER SIDES BEING PARALLEL TO THE LINE PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID TUBING AT WHICH LINE SAID TUBING ATTAINS A FLATTENED CONDITION.
References Cited (Backward Citations)
US2559386A
Cited
US2631332A
Cited
US2668324A
Cited
US2720680A
Cited
GB744977A
Cited
US3065097A
Cited
BE599939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |