US3093445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polyamide filaments
Assignee: British Nylon Spinners Ltd
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Filing: 1961-07-17
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Granted: 1963-06-11
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Expires: 1981-07-17
Abstract
No abstract record available.
Inventors
- 👤 Freeman Ronald Frank James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:22
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/04; C; C08; C08G; C08G69/00; C08G69/46; D01F; D01F6/00; D01F6/58; D01F6/60; Y; Y10; Y10S; Y10S264/00; Y10S264/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS FOR THE MANUFACTURE OF POLYAMIDE FILAMENTS CONTAINING NOT MORE THAN 2% OF LOW MOLECULAR WEIGHT MATERIAL AND SUITABLE FOR TEXTILE PURPOSES WHICH COMPRISES MELTING HIGH MOLECULAR WEIGHT POLYCAPROLACTAM CHIPS WHICH HAVE BEEN WASHED WITH WATER AND INCOMPLETELY DRIED AND CONTAIN OVER 1/4% BY WEIGHT OF WATER BY HEATING SAID CHIPS AT A TEMPERATURE FROM 250*C. TO 295*C. UNDER AN INERT GAS AT A PRESSURE FROM 0.5 TO 5 ATMOSPHERES, MAINTAINING THE POLYAMIDE IN A MOLTEN CONDITION FOR A PERIOD NOT EXCEEDING IN MINUTES THE VALUE OF THE FOLLOWING EXPRESSION:
Claim 2
Dependent Claim
91 words
A PROCESS FOR THE MANUFACTURE OF POLYAMIDE FILAMENTS CONTAINING NOT MORE THAN 2% OF LOW MOLECULAR WEIGHT MATERIAL AND SUITABLE FOR TEXTILE PURPOSES WHICH COMPRISES MELTING HIGH MOLECULAR WEIGHT POLYCAPROLACTAM CHIPS WHICH HAVE BEEN WASHED WITH WATER AND INCOMPLETELY DRIED AND CONTAIN OVER 1/4% BY WEIGHT OF WATER BY HEATING SAID CHIPS AT A TEMPERATURE FROM 250*C. TO 295*C. UNDER AN INERT GAS AT A PRESSURE FROM 0.5 TO 5 ATMOSPHERES, MAINTAINING THE POLYAMIDE IN A MOLTEN CONDITION FOR A PERIOD NOT EXCEEDING IN MINUTES THE VALUE OF THE FOLLOWING EXPRESSION:
References Cited (Backward Citations)
US2571975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |