US3236825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl chloride fibres and process for producing same
Assignee: Rhovyl SA
•
Filing: 1962-11-01
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Granted: 1966-02-22
•
Expires: 1982-11-01
Abstract
No abstract record available.
Inventors
- 👤 Gord Louis Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:53
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
POLYVINYL CHLORIDE FIBRES HAVING A BREAKING STRENGTH OF MORE THAN 2 G. PER DENIER, A SHRINKAGE IN BOILING WATER OF LESS THAN 10% AND A SHRINKAGE IN TRICHLORETHYLENE AT 40*C. OF LESS THAN 10%.
Claim 2
Dependent Claim
34 words
POLYVINYL CHLORIDE FIBRES HAVING A BREAKING STRENGTH OF MORE THAN 2 G. PER DENIER, A SHRINKAGE IN BOILING WATER OF LESS THAN 10% AND A SHRINKAGE IN TRICHLORETHYLENE AT 40*C. OF LESS THAN 10%.
Claim 3
Dependent Claim
159 words
PROCESS FOR THE PRODUCTION OF POLYVINYL CHLORIDE FIBRES HAVING A BREAKING STRENGTH OF MORE THAN 2 GRAMS PER DENIER, A SHRINKAGE IN BOILING WATER OF LESS THAN 10% AND A SHRINKAGE IN TRICHLOROETHYLENE AT 40*C. OF LESS THAN 10%, WHICH COMPRISES SPINNING A SOLUTION OF POLYVINYL CHLORIDE HAVING AN AFNOR INDEX OF 450 AS DETERMINED IN CYCLOHEXANNE AT 25*C., WHERE THE AFNOR INDEX EQUALS (N/N0 - 1)/C AND N EQUALS THE DYNAMIC VISCOSITY OF THE SOLUTION N0 EQUALS THE DYNAMIC VISCOSITY OF THE PURE SOLVENT C EQUALS THE CONCENTRATION IN GRAMS PER MILLILITRE OF THE SOLUTION AND OBTAINED BY POLYMERISATION OF VINYL CHLORIDE AT A TEMPERATURE BELOW 0*C., STRETCHING THE RESULTING FILAMENTS AT A TEMPERATURE OF 100 TO 150*C., AND THEREAFTER SUBJECTING THEM TO TWO STAGES OF TREATMENT CARRIED OUT IN EITHER ORDER, ONE BEING HEAT SETTING AT A TEMPERATURE OF AT MOST 170*C. AND THE OTHER BING A HEAT RELAXATION TREATMENT TO CAUSE SHRINKAGE OF AT MOST 30%.
Claim 4
Dependent Claim
159 words
PROCESS FOR THE PRODUCTION OF POLYVINYL CHLORIDE FIBRES HAVING A BREAKING STRENGTH OF MORE THAN 2 GRAMS PER DENIER, A SHRINKAGE IN BOILING WATER OF LESS THAN 10% AND A SHRINKAGE IN TRICHLOROETHYLENE AT 40*C. OF LESS THAN 10%, WHICH COMPRISES SPINNING A SOLUTION OF POLYVINYL CHLORIDE HAVING AN AFNOR INDEX OF 450 AS DETERMINED IN CYCLOHEXANNE AT 25*C., WHERE THE AFNOR INDEX EQUALS (N/N0 - 1)/C AND N EQUALS THE DYNAMIC VISCOSITY OF THE SOLUTION N0 EQUALS THE DYNAMIC VISCOSITY OF THE PURE SOLVENT C EQUALS THE CONCENTRATION IN GRAMS PER MILLILITRE OF THE SOLUTION AND OBTAINED BY POLYMERISATION OF VINYL CHLORIDE AT A TEMPERATURE BELOW 0*C., STRETCHING THE RESULTING FILAMENTS AT A TEMPERATURE OF 100 TO 150*C., AND THEREAFTER SUBJECTING THEM TO TWO STAGES OF TREATMENT CARRIED OUT IN EITHER ORDER, ONE BEING HEAT SETTING AT A TEMPERATURE OF AT MOST 170*C. AND THE OTHER BING A HEAT RELAXATION TREATMENT TO CAUSE SHRINKAGE OF AT MOST 30%.
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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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |