Patent US3056747A successfully refreshed from Google Patents.
US3056747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of fibrous alumina monohydrate
Assignee: EIDP Inc
•
Filing: 1957-12-13
•
Granted: 1962-10-02
•
Expires: 1977-12-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Paul Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:38
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01P; C01P2002/00; C01P2002/70; C01P2004/00; C01P2004/10; C01P2004/54; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A PROCES FOR MAKING FIBROUS ALUMINA HAVING THE CHARACTERISTIC X-RAY DIFFRACTION PATTERN OF BOEHMITE, THE STEP COMPRISING HEATING AN AQUEOUS ACIDIC DISPERSISON OF ALUMINA ONE-HALF OF A SAMPLE OF WHICH CAN BE DOPOLYMERIZED IN EXCESS ACIDS AT A TEMPARATURE OF 98*C. IN A TIME, THETA, OF LESS THAN 500 MINUTES, THE DISPERSION CONTAINING 0.33 TO 100% OF THE SULFATE REQUIRED TO FORM THE NORMAL SALT WITH THE ALUMINUM PRESENT, HEATING BEING CONDUCTED AT A TEMPERATURE ABOVE 250*C. AND AT A PRESSURE SUFFICIENT TO MAINTAIN A FLUID DENSITY OF AT LEAST 0.5 UNTIL SUBSTANTIALLY ALL OF THE ALUMINA IS CONVERTED TO THE FORM OF FIBERS, AT LEAST ONE DIMENSION OF WHICH IS IN COLLOIDAL RANGE AND WHICH HAVE AN AXIAL RATIO OF AT LEAST 100:1.
Claim 2
Dependent Claim
125 words
IN A PROCES FOR MAKING FIBROUS ALUMINA HAVING THE CHARACTERISTIC X-RAY DIFFRACTION PATTERN OF BOEHMITE, THE STEP COMPRISING HEATING AN AQUEOUS ACIDIC DISPERSISON OF ALUMINA ONE-HALF OF A SAMPLE OF WHICH CAN BE DOPOLYMERIZED IN EXCESS ACIDS AT A TEMPARATURE OF 98*C. IN A TIME, THETA, OF LESS THAN 500 MINUTES, THE DISPERSION CONTAINING 0.33 TO 100% OF THE SULFATE REQUIRED TO FORM THE NORMAL SALT WITH THE ALUMINUM PRESENT, HEATING BEING CONDUCTED AT A TEMPERATURE ABOVE 250*C. AND AT A PRESSURE SUFFICIENT TO MAINTAIN A FLUID DENSITY OF AT LEAST 0.5 UNTIL SUBSTANTIALLY ALL OF THE ALUMINA IS CONVERTED TO THE FORM OF FIBERS, AT LEAST ONE DIMENSION OF WHICH IS IN COLLOIDAL RANGE AND WHICH HAVE AN AXIAL RATIO OF AT LEAST 100:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |