US2712490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for spinning swollen polyvinyl chloride
Assignee: Rhodiaceta SA
•
Filing: 1950-06-22
•
Granted: 1955-07-05
•
Expires: 1970-06-22
Abstract
No abstract record available.
Inventors
- 👤 Stuchlik Rene Emile Fernand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:41
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR CONVERTING POLYVINYL CHLORIDE INTO SPUN PRODUCTS, SAID PROCESS COMPRISING SUBJECTING POLYVIMYL CHLORIDE HAVING A MOLECULAR WEIGHT OF AT LEAST 15,000 TO SWELLING BY A LIQUID MEDIUM WHICH CONSISTS OF A NON-SOLVENT SWELLING FLUID FOR THE POLYVINYL CHLORIDE USED AS STARTING MATERIAL IN AN AMOUNT WHICH IS AT LEAST EQUAL TO THE WEIGHT OF THE POLYVINYL CHLORIDE AND AT MOST EQUAL TO THE MAXIMUM AMOUNT WHICH THE POLYVINYL CHLORIDE CAN RETAIN BY SWELLING, CAUSING THE RESULTING MASS TO EXTRUDE THROUGH THE ORIFICES OF SPINNING PLATE AT A TEMPERATURE ABOVE THE BOILING TEMPERATURE OF THE LIQUID AND A HIGHER PRESSURE THAN THE VAPOR TENSION OF THE LIQUID AT THAT TEMPERATURE, AND SUBSEQUENTLY REMOVING THE LIQUID FROM THE EXTRUDED PRODUCT.
Claim 2
Dependent Claim
120 words
A PROCESS FOR CONVERTING POLYVINYL CHLORIDE INTO SPUN PRODUCTS, SAID PROCESS COMPRISING SUBJECTING POLYVIMYL CHLORIDE HAVING A MOLECULAR WEIGHT OF AT LEAST 15,000 TO SWELLING BY A LIQUID MEDIUM WHICH CONSISTS OF A NON-SOLVENT SWELLING FLUID FOR THE POLYVINYL CHLORIDE USED AS STARTING MATERIAL IN AN AMOUNT WHICH IS AT LEAST EQUAL TO THE WEIGHT OF THE POLYVINYL CHLORIDE AND AT MOST EQUAL TO THE MAXIMUM AMOUNT WHICH THE POLYVINYL CHLORIDE CAN RETAIN BY SWELLING, CAUSING THE RESULTING MASS TO EXTRUDE THROUGH THE ORIFICES OF SPINNING PLATE AT A TEMPERATURE ABOVE THE BOILING TEMPERATURE OF THE LIQUID AND A HIGHER PRESSURE THAN THE VAPOR TENSION OF THE LIQUID AT THAT TEMPERATURE, AND SUBSEQUENTLY REMOVING THE LIQUID FROM THE EXTRUDED PRODUCT.
References Cited (Backward Citations)
US1791009A
Cited
US2353270A
Cited
US2420565A
Cited
US2427513A
Cited
US2431078A
Cited
US2517356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-04 | 1959-01-03 | 1959-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-04 | 1963-01-03 | 1963-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-04 | 1967-01-03 | 1967-07-05 | $7700.00 | Window Closed / Lapsed |