Patent US3062746A successfully refreshed from Google Patents.
US3062746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing ferrimagnetic materials
Assignee: WR Grace and Co
•
Filing: 1960-02-29
•
Granted: 1962-11-06
•
Expires: 1980-02-29
Abstract
No abstract record available.
Inventors
- 👤 Robert B Maccallum
- 👤 Forrest R Hurley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:05
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2675; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/28; C30B9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A METHOD OF PREPARING A FERRITE MATERIAL HAVING A GARNET TYPE STRUCTURE WHICH COMPRISES THE STEPS OF MIXING AN OXIDE SELECTED FROM THE GROUP CONSISTING OF YTTRIUM OXIDE AND A RARE EARTH OXIDE WHEREIN THE RARE EARTH ION HAS AN IONIC RADIUS OF LESS THAN 1.14 ANGSTROM UNITS WITH FERRIC OXIDE IN THE RATIO OF ABOUT 3 TO MOLES OF SAID OXIDE TO 5 TO ABOUT 10 MOLES OF FERRIC OXIDE IN A CONCENTRATED SOLUTION OF AN ALKALI METAL HYDROXIDE, HEATING SAID MIXTURE FROM 11/2 TO 5 HOURS WITH STIRRING AT A TEMPERATURE OF ABOUT 100 TO 200*C. FOLLOWED BY HEATING TO A TEMPERATURE OF 250 TO 400*C. FOR ABOUT 2 TO 5 HOURS, COOLING THE MELT, SEPARATING AND WASHING THE OXIDES AND CALCINING SAID OXIDES AT ABOUT 1000*C. FOR ABOUT 2 TO 10 HOURS AND RECOVERING THE CRYSTALLINE FERRITE PRODUCT.
Claim 2
Independent Claim
141 words
A METHOD OF PREPARING A FERRITE MATERIAL HAVING A GARNET TYPE STRUCTURE WHICH COMPRISES THE STEPS OF MIXING AN OXIDE SELECTED FROM THE GROUP CONSISTING OF YTTRIUM OXIDE AND A RARE EARTH OXIDE WHEREIN THE RARE EARTH ION HAS AN IONIC RADIUS OF LESS THAN 1.14 ANGSTROM UNITS WITH FERRIC OXIDE IN THE RATIO OF ABOUT 3 TO MOLES OF SAID OXIDE TO 5 TO ABOUT 10 MOLES OF FERRIC OXIDE IN A CONCENTRATED SOLUTION OF AN ALKALI METAL HYDROXIDE, HEATING SAID MIXTURE FROM 11/2 TO 5 HOURS WITH STIRRING AT A TEMPERATURE OF ABOUT 100 TO 200*C. FOLLOWED BY HEATING TO A TEMPERATURE OF 250 TO 400*C. FOR ABOUT 2 TO 5 HOURS, COOLING THE MELT, SEPARATING AND WASHING THE OXIDES AND CALCINING SAID OXIDES AT ABOUT 1000*C. FOR ABOUT 2 TO 10 HOURS AND RECOVERING THE CRYSTALLINE FERRITE PRODUCT.
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) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |