US3285592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for dehydrating and melting thermoplastic polymers for spinning or molding
Assignee: Kanegafuchi Spinning Co Ltd
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Filing: 1964-05-19
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Granted: 1966-11-15
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Expires: 1984-05-19
Abstract
No abstract record available.
Inventors
- 👤 Ueda Keizo
- 👤 Ando Satoshi
- 👤 Tanaka Yusaku
- 👤 Fujimura Kiyoiti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:05
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/46; B; B29; B29B; B29B13/00; B29B13/02; B29B13/022; C08J; C08J3/00; D; D01; D01D; D01D1/00; D01D1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD OF DEHYDRATING AND MELTING THERMOPLASTIC POLYMERS HAVING A SOFTENING POINT HIGHER THAN THE BOILING POINT OF WATER, WHICH COMPRISES: PLACING SOLID PARTICLES OF A THERMOPLASTIC POLYMER CONTAINING WATER IN A BODY OF LIQUID WHICH IS INERT TO AND INSOLUBLE WITH THE POLYMER, SAID POLYMER HAVING A SOFTENING POINT HIGHER THAN THE BOILING POINT OF WATER, MAINTAINING SAID LIQUID AT A TEMPERATURE BELOW THE SOFTENING POINT OF THE POLYMER BUT ABOVE THE BOILING POINT OF WATER SO THAT THE WATER WILL BE VAPORIZED AND THE POLYMER WILL BE IN AN UNSOFTENED CONDITION; REMOVING THE VAPORIZED WATER FROM THE POLYMER AND THE LIQUIDL AND THEN MELTING THE POLYMER AND SUBJECTING IT TO A MOLDING OPERATION.
Claim 2
Independent Claim
115 words
A METHOD OF DEHYDRATING AND MELTING THERMOPLASTIC POLYMERS HAVING A SOFTENING POINT HIGHER THAN THE BOILING POINT OF WATER, WHICH COMPRISES: PLACING SOLID PARTICLES OF A THERMOPLASTIC POLYMER CONTAINING WATER IN A BODY OF LIQUID WHICH IS INERT TO AND INSOLUBLE WITH THE POLYMER, SAID POLYMER HAVING A SOFTENING POINT HIGHER THAN THE BOILING POINT OF WATER, MAINTAINING SAID LIQUID AT A TEMPERATURE BELOW THE SOFTENING POINT OF THE POLYMER BUT ABOVE THE BOILING POINT OF WATER SO THAT THE WATER WILL BE VAPORIZED AND THE POLYMER WILL BE IN AN UNSOFTENED CONDITION; REMOVING THE VAPORIZED WATER FROM THE POLYMER AND THE LIQUIDL AND THEN MELTING THE POLYMER AND SUBJECTING IT TO A MOLDING OPERATION.
References Cited (Backward Citations)
FR925323A
Cited
US2289774A
Cited
US2295942A
Cited
US2437685A
Cited
US2437704A
Cited
US2658743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |