Patent US1954590A successfully refreshed from Google Patents.
Patent US4162390A successfully refreshed from Google Patents.
US3084993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of crimped filaments
Assignee: Akzo Nobel UK PLC
•
Filing: 1962-08-31
•
Granted: 1963-04-09
•
Expires: 1982-08-31
Abstract
No abstract record available.
Inventors
- 👤 Dawson John Burt
- 👤 Krzesinski Boleslaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:28
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/08; Y; Y10; Y10S; Y10S264/00; Y10S264/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR PRODUCING CRIMPED POLYACRYLONITRILE FILAMENTS, COMPRISING SPINNING SIMULTANEOUSLY AND ADJACENTLY INTO A LIQUID COAGULANT TWO SOLUTIONS CONTAINING DIFFERENT CONCENTRATIONS OF THE SAME POLYACRYLONITRILE POLYMER, THE DIFFERENCE IN CONCENTRATIONS BEING AT LEAST 4 PERCENT OF THE SMALLER CONCENTRATIONS AND THE TWO SOLUTIONS BEING ALLOWED TO COME INTO CONTACT WITH EACH OTHER BEFORE THE POLYMER THEREIN IS WHOLLY COAGULATED, STRETCHING THE RESULTING FILAMENTS TO AT LEAST FOUR TIMES THEIR UNSTRETCHED LENGTH AND DRYING THE FILAMENTS UNDER CONDITIONS ALLOWING THEM TO SHRINK.
Claim 2
Dependent Claim
81 words
A PROCESS FOR PRODUCING CRIMPED POLYACRYLONITRILE FILAMENTS, COMPRISING SPINNING SIMULTANEOUSLY AND ADJACENTLY INTO A LIQUID COAGULANT TWO SOLUTIONS CONTAINING DIFFERENT CONCENTRATIONS OF THE SAME POLYACRYLONITRILE POLYMER, THE DIFFERENCE IN CONCENTRATIONS BEING AT LEAST 4 PERCENT OF THE SMALLER CONCENTRATIONS AND THE TWO SOLUTIONS BEING ALLOWED TO COME INTO CONTACT WITH EACH OTHER BEFORE THE POLYMER THEREIN IS WHOLLY COAGULATED, STRETCHING THE RESULTING FILAMENTS TO AT LEAST FOUR TIMES THEIR UNSTRETCHED LENGTH AND DRYING THE FILAMENTS UNDER CONDITIONS ALLOWING THEM TO SHRINK.
References Cited (Backward Citations)
US3038236A
Cited
US3038235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |