US2719009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing an elastomer dispersible magnetic iron oxide
Assignee: Clevite Corp
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Filing: 1954-08-12
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Granted: 1955-09-27
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Expires: 1974-08-12
Abstract
No abstract record available.
Inventors
- 👤 Szegvari Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:46
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; C; C09; C09K; C09K23/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; H01F1/113; H01F1/117
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A PROCESS FOR THE PRODUCTION OF AN ELASTOMER DISPERSIBLE MAGNETIC IRON OXIDE COMPRISING SLURRYING A COMMERCIAL MAGNETIC IRON OXIDE IN AN AQUEOUS GRINDING MEDIUM, ADDING THERETO A DISPERSING AGENT AND A PH ADJUSTING AGENT IN AN AMOUNT SUFFICIENT TO ADJUST THE PH OF THE SLURRY WITHIN A PH RANGE OF FROM 9 TO 10, SUBJECTING THE OXIDE SLURRY TO GRINDING UNTIL VIRTUALLY ALL PARTICLES ARE REDUCED TO A SIZE NOT GREATER THAN 0.5 MICRON, TRANSFERRING THE GROUND OXIDE TO A SETTLING TANK WHEREIN THE MAGNETIC IRON OXIDE SETTLES OUT, DECANTING OFF THE SUPERNATANT LIQUOR ALONG WITH THE DISPERSING AGENT AND ANY SUSPENDED NONMAGNETIC MATERIAL, FILTERING THE SETTLED OXIDE TO OBTAIN AN OXIDE FILTER CAKE, DRYING THE FILTER CAKE, BREAKING UP THE CAKE INTO POWDER, SUBJECTING THE POWDER TO A REVERSING POLARITY ELECTROMAGNETIC FIELD TO DEMAGNETIZE THE OXIDE, PASSING THE DEMAGNETIZED OXIDE THROUGH A MICROPULVERIZER TO DEFLOCCULATE THE OXIDE POWDER INTO DISCRETE PARTICLES AND RECOVERING THE FINISHED OXIDE.
Claim 2
Dependent Claim
157 words
A PROCESS FOR THE PRODUCTION OF AN ELASTOMER DISPERSIBLE MAGNETIC IRON OXIDE COMPRISING SLURRYING A COMMERCIAL MAGNETIC IRON OXIDE IN AN AQUEOUS GRINDING MEDIUM, ADDING THERETO A DISPERSING AGENT AND A PH ADJUSTING AGENT IN AN AMOUNT SUFFICIENT TO ADJUST THE PH OF THE SLURRY WITHIN A PH RANGE OF FROM 9 TO 10, SUBJECTING THE OXIDE SLURRY TO GRINDING UNTIL VIRTUALLY ALL PARTICLES ARE REDUCED TO A SIZE NOT GREATER THAN 0.5 MICRON, TRANSFERRING THE GROUND OXIDE TO A SETTLING TANK WHEREIN THE MAGNETIC IRON OXIDE SETTLES OUT, DECANTING OFF THE SUPERNATANT LIQUOR ALONG WITH THE DISPERSING AGENT AND ANY SUSPENDED NONMAGNETIC MATERIAL, FILTERING THE SETTLED OXIDE TO OBTAIN AN OXIDE FILTER CAKE, DRYING THE FILTER CAKE, BREAKING UP THE CAKE INTO POWDER, SUBJECTING THE POWDER TO A REVERSING POLARITY ELECTROMAGNETIC FIELD TO DEMAGNETIZE THE OXIDE, PASSING THE DEMAGNETIZED OXIDE THROUGH A MICROPULVERIZER TO DEFLOCCULATE THE OXIDE POWDER INTO DISCRETE PARTICLES AND RECOVERING THE FINISHED OXIDE.
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) | 1958-09-26 | 1959-03-28 | 1959-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-26 | 1963-03-28 | 1963-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-26 | 1967-03-28 | 1967-09-27 | $7700.00 | Window Closed / Lapsed |