US3265789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming thermoplastic films
Assignee: Union Carbide Corp
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Filing: 1960-11-30
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Granted: 1966-08-09
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Expires: 1980-11-30
Abstract
No abstract record available.
Inventors
- 👤 Peter H Hofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:18
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/03; B29C48/09; B29C48/10; B29C48/885; B29C48/9115; B29C48/912; B29C48/001; B29C48/0018; B29C48/0019
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN A METHOD FOR FORMING THERMOPLASTIC FILM COMPRISING EXTRUDING MOLTEN THERMOPLASTIC FROM A FILM-FORMING DIE, GENERALLY COOLING THE ENTIRE FILM SURFACE AND WINDING THE COOLED FILM ON A ROLL, THE IMPROVEMENT WHICH COMPRISES EFFECTING SIMULTANEOUSLY WITH THE GENERAL COOLING OF THE ENTIRE FILM SURFACE A SELECTIVELY INCREASE IN THE THICKNESS OF A NARROW CONTIGUOUS PORTION OF A SURFACE OF THE FILM BY IMPINGING FROM ONE TO SIX NAROW COLUMNS OF COOLING FLUID IN A SUBSTANTIALLY CONTINUOUS TRAVERSING PATTERN ON SELECTED NARROW CONTIGUOUS PORTIONS OF SAID FILM SURFACE, THE GREATEST CROSS-SECTIONAL DIMENSION OF SAID COLUMNS BEIING SUBSTANTIALLY LESS THAN THE DISTANCE BETWEEN ADJACENT COLUMNS.
Claim 2
Dependent Claim
103 words
IN A METHOD FOR FORMING THERMOPLASTIC FILM COMPRISING EXTRUDING MOLTEN THERMOPLASTIC FROM A FILM-FORMING DIE, GENERALLY COOLING THE ENTIRE FILM SURFACE AND WINDING THE COOLED FILM ON A ROLL, THE IMPROVEMENT WHICH COMPRISES EFFECTING SIMULTANEOUSLY WITH THE GENERAL COOLING OF THE ENTIRE FILM SURFACE A SELECTIVELY INCREASE IN THE THICKNESS OF A NARROW CONTIGUOUS PORTION OF A SURFACE OF THE FILM BY IMPINGING FROM ONE TO SIX NAROW COLUMNS OF COOLING FLUID IN A SUBSTANTIALLY CONTINUOUS TRAVERSING PATTERN ON SELECTED NARROW CONTIGUOUS PORTIONS OF SAID FILM SURFACE, THE GREATEST CROSS-SECTIONAL DIMENSION OF SAID COLUMNS BEIING SUBSTANTIALLY LESS THAN THE DISTANCE BETWEEN ADJACENT COLUMNS.
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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |