US3141786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous boehmite alumina molding powder and processes
Assignee: —
•
Filing: —
•
Granted: 1964-07-21
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Expires: 1981-07-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62655; C04B35/63; C04B35/6303; C04B35/632; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3217; C04B2235/327; C04B2235/3272; C04B2235/70; C04B2235/72; C04B2235/74; C04B2235/77; C04B2235/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A MOLDING POWDER CONSISTING ESSENTIALLY OF AN INTIMATE MIXTURE OF PULVERULENT FIBROUS ALUMINA MONOHYDRATE HAVING THE BOEHMITE CRYSTAL LATTICE AND MADE UP OF ALUMINA FIBRILS HAVING A SURFACE AREA OF 200 TO 400 SQUARE METERS PER GRAM AND AN AVERAGE LENGTH OF 25 TO 1500 MILLIMICRONS, SAID ALUMINA BEING SUBSTANTIALLY FREE OF NONVOLATILE IMPURITIES, AND ABOUT FROM 0.5 TO 5% BY WEIGHT, BASED ON THE ALUMINA AS AL2O3, OF A GRAIN GROWTH INHIBITOR SELECTED FROM THE GROUP CONSISTING OF NICKEL OXIDE, MAGNESIUM OXIDE, CHROMIUM OXIDE, COBALT OXIDE, MAGNESIUM FLUORIDE, AND COMPOUNDS THERMALLY DECOMPOSABLE IN AIR TO SAID OXIDES.
Claim 2
Dependent Claim
98 words
A MOLDING POWDER CONSISTING ESSENTIALLY OF AN INTIMATE MIXTURE OF PULVERULENT FIBROUS ALUMINA MONOHYDRATE HAVING THE BOEHMITE CRYSTAL LATTICE AND MADE UP OF ALUMINA FIBRILS HAVING A SURFACE AREA OF 200 TO 400 SQUARE METERS PER GRAM AND AN AVERAGE LENGTH OF 25 TO 1500 MILLIMICRONS, SAID ALUMINA BEING SUBSTANTIALLY FREE OF NONVOLATILE IMPURITIES, AND ABOUT FROM 0.5 TO 5% BY WEIGHT, BASED ON THE ALUMINA AS AL2O3, OF A GRAIN GROWTH INHIBITOR SELECTED FROM THE GROUP CONSISTING OF NICKEL OXIDE, MAGNESIUM OXIDE, CHROMIUM OXIDE, COBALT OXIDE, MAGNESIUM FLUORIDE, AND COMPOUNDS THERMALLY DECOMPOSABLE IN AIR TO SAID OXIDES.
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) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |