US3754067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blown tube production
Assignee: Industries Leco Inc
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Filing: 1970-10-12
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Granted: 1973-08-21
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Expires: 1990-10-12
Abstract
Abstract THE INVENTION PROVIDES A NOVEL PROCESS FOR PRODUCING, BY THE BLOWN TUBE PROCESS, FILM HAVING IMPROVED AND BALANCED CHARACTERISTICS. THE IMPROVED FILM IS CHARACTERIZED BY CRYSTALLITES DISPERSED THROUGHOUT THE FILM IN AMORPHOUS AREAS AND WHICH IS SUBSTANTIALLY FREE OF CRYSTALLINE FORMATIONS, AS WELL AS HAVING IMPROVED OTHER PROPERTIS. THE PROCESS DISCLOSED EMPLOYS, THE STEPS OF ACTING ON A MOLTEN TUBE FOLLOWING EXTRUSION TO COOL IT TO A TEMPERATURE ABOVE THE CRYSTALLINE FORMATION TEMPERATURE, FOLLOWED BY A ANNEALING STEP AND A SOLIDIFICATION STEP. THE APPARATUS FOR THE PROCESS INCLUDES FIRST COOLING MEANS, IN ANNEALING AND A FURTHER COOLING CHAMBER OR MEANS.
Inventors
- 👤 D Eve
- 👤 A Bose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:27
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/885; B29C48/03; B29C48/09; B29C48/10; B29C48/911; B29C48/9115; B29C48/912; B29C48/001; B29C48/0018; B29C48/0019; Y; Y10; Y10S; Y10S264/00; Y10S264/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |