Patent US3773884A successfully refreshed from Google Patents.
US3773884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for fibers containing uniform distribution of insoluble solid additives therein
Assignee: Wyeth Holdings LLC
•
Filing: 1972-04-07
•
Granted: 1973-11-20
•
Expires: 1992-04-07
Abstract
Abstract A PROCESS FOR PREPARING FIBERS WHICH COMPRISES (A) PREPARING A POLYMER SOLUTION IN A SOLVENT THEREFOR, (B) PREPARING A SOLUTION OF A SOLID PROPERTY-MODIFYING ADDITIVE IN AN ORGANIC LIQUID WHICH IS INSOLUBLE IN THE POLYMER SOLUTION, (C) DISPERSING THE ADDITIVE SOLUTION AND POLYMER SOLUTION BY HIGH SHEAR MIXING, (D) IMMEDIATELY WET SPINNING THE DISPERSION INTO FIBER, AND (E)THEREAFTER REMOVING SAID ORGANIC LIQUID FROM THE FORMED FIBER BY EVAPORATION OR WASHING TO LEAVE A UNIFORM DISTRIBUTION OF INSOLUBLE SOLID PROPERTY-MODIFYING ADDITIVE IN THE FIBER.
Inventors
- 👤 Y Shimosaka
- 👤 Y Uno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:26
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/215; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |