Patent US3387068A successfully refreshed from Google Patents.
US3387068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming transparent unoriented polyamide resin films
Assignee: Honeywell International Inc
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Filing: 1965-03-26
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Granted: 1968-06-04
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Expires: 1985-03-26
Abstract
No abstract record available.
Inventors
- 👤 William C Scudder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:28
CPC Classifications
B; B29; B29D; B29D7/00; B29D7/01; B29C; B29C71/00; C; C08; C08L; C08L77/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A PROCESS FOR PREPARING TRANSPARENT, SUBSTANTIALLY HAZE-FREE UNORIENTED FILMS OF 0.4 TO 2 MIL THICKNESS HAVING HIGH MECHANICAL STRENGTH FROM A MOLTEN POLYAMIDE RESIN WHICH COMPRISES: (1) EXTRUDING THE MOLTEN RESIN AT A TEMPERATURE ABOVE ITS MELTING POINT ONTO A SMOOTH MOVING SUPPORT; (2) CONTROLLING THE TEMPERATURE OF THE SUPPORT SO THAT THE MOLTEN RESIN IS COOLED DURING ITS CONTACT WITH THE SUPPORT TO A TEMPERATURE NOT GREATER THAN ABOUT 210*F. TO FORM A CHHERENT FILM; (3) SUBJECTING THE FILM TO WATER VAPOR LADEN ATMOSPHERE AT A TEMPERATURE OF AT LEAST ABOUT 125*F. FOR A TIME SUFFICIENT TO OBTAIN A FILM HAVING A WATER CONTENT OF 1.3 PERCENT TO 4.0 PERCENT BASED ON THE WEIGHT OF THE FILM; AND (4) HEATING THE MOISTURIIZED FILM AT A TEMPERATURE OF AT LEAST ABOUT 125*F. FOR A TIME SUFFICIENT TO REDUCE THE WATER CONTENT OF THE FILM TO BETWEEN 0.4 PERCENT AND 3.5 PERCENT BASED ON THE WEIGHT OF THE FILM.
Claim 2
Dependent Claim
158 words
A PROCESS FOR PREPARING TRANSPARENT, SUBSTANTIALLY HAZE-FREE UNORIENTED FILMS OF 0.4 TO 2 MIL THICKNESS HAVING HIGH MECHANICAL STRENGTH FROM A MOLTEN POLYAMIDE RESIN WHICH COMPRISES: (1) EXTRUDING THE MOLTEN RESIN AT A TEMPERATURE ABOVE ITS MELTING POINT ONTO A SMOOTH MOVING SUPPORT; (2) CONTROLLING THE TEMPERATURE OF THE SUPPORT SO THAT THE MOLTEN RESIN IS COOLED DURING ITS CONTACT WITH THE SUPPORT TO A TEMPERATURE NOT GREATER THAN ABOUT 210*F. TO FORM A CHHERENT FILM; (3) SUBJECTING THE FILM TO WATER VAPOR LADEN ATMOSPHERE AT A TEMPERATURE OF AT LEAST ABOUT 125*F. FOR A TIME SUFFICIENT TO OBTAIN A FILM HAVING A WATER CONTENT OF 1.3 PERCENT TO 4.0 PERCENT BASED ON THE WEIGHT OF THE FILM; AND (4) HEATING THE MOISTURIIZED FILM AT A TEMPERATURE OF AT LEAST ABOUT 125*F. FOR A TIME SUFFICIENT TO REDUCE THE WATER CONTENT OF THE FILM TO BETWEEN 0.4 PERCENT AND 3.5 PERCENT BASED ON THE WEIGHT OF THE FILM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |