Patent US3328503A successfully refreshed from Google Patents.
US3328503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of thermoplastic films
Assignee: Union Carbide Corp
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Filing: 1965-03-24
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Granted: 1967-06-27
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Expires: 1985-03-24
Abstract
No abstract record available.
Inventors
- 👤 Fred H Ancker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:51
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/24; B29C48/00; B29C48/001; B29C48/0018; B29C48/0019; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
PROCESS FOR THE PREPARATION OF ORIENTED CRYSTALLINE THERMOPLASTIC FILM AND SHEETING WHICH COMPRISES PASSING A PREFORMED WEB OF A MOLTEN, AMORPHOUS, CRYSTALLIZABLE, ORGANIC, THERMOPLASTIC POLYMER INTO THE NIP FORMED BY A PAIR OF COUNTER-ROTATING ROLLS WITHOUT THE FORMATION OF A BANK AT THE INGRESS SIDE OF THE NIP, MAINTAINING THE TEMPERATURE OF AT LEAST ONE OF SAID ROLLS BELOW THE CRYSTALLINE MELTING POINT OF SAID POLYMER SO THAT THE WEB IS OPTICALLY CLEAR WITHOUT THE FORMATION OF A FROSTLINE AS IT ENTERS THE ROLL NIP, INCREASING THE ROLL SEPARATING FORCE IN SAID ROLL NIP UNTIL A CLEAR, GLOSSY, WEB HAVING A CRYSTALLINITY OF AT LEAST ABOUT FIVE PERCENT EMERGES FROM THE EGRESS SIDE OF SAID ROLL NIP.
Claim 2
Dependent Claim
117 words
PROCESS FOR THE PREPARATION OF ORIENTED CRYSTALLINE THERMOPLASTIC FILM AND SHEETING WHICH COMPRISES PASSING A PREFORMED WEB OF A MOLTEN, AMORPHOUS, CRYSTALLIZABLE, ORGANIC, THERMOPLASTIC POLYMER INTO THE NIP FORMED BY A PAIR OF COUNTER-ROTATING ROLLS WITHOUT THE FORMATION OF A BANK AT THE INGRESS SIDE OF THE NIP, MAINTAINING THE TEMPERATURE OF AT LEAST ONE OF SAID ROLLS BELOW THE CRYSTALLINE MELTING POINT OF SAID POLYMER SO THAT THE WEB IS OPTICALLY CLEAR WITHOUT THE FORMATION OF A FROSTLINE AS IT ENTERS THE ROLL NIP, INCREASING THE ROLL SEPARATING FORCE IN SAID ROLL NIP UNTIL A CLEAR, GLOSSY, WEB HAVING A CRYSTALLINITY OF AT LEAST ABOUT FIVE PERCENT EMERGES FROM THE EGRESS SIDE OF SAID ROLL NIP.
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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |