Patent US3801551A successfully refreshed from Google Patents.
US3801551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making fibrillar masses of acidic copolymers
Assignee: Dow Chemical Co
•
Filing: 1972-07-05
•
Granted: 1974-04-02
•
Expires: 1992-07-05
Abstract
Abstract FIBRILLAR MASSES OF ACIDIC THERMOPLASTIC COPOLYMERS ARE OBTAINED BY DIGESTING STRUCTURED GRANULES THEREOF IN AQUEOUS ALKALI. GRANULES FROM DIE ORIFICE EXTRUDED STRANDS OF SOLID COPOLYMER OF ETHYLENE AND 16 WEIGHT PERCENT ACRYLIC ACID, HEATED IN DILUTE AQUEOUS POTASSIUM HYDROXIDE AT 90*C., SEPARATED INTO MASSES OF LOOSE, FLUFFY FIBRILS.
Inventors
- 👤 R Bohme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:36
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/40
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |