US3198603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing ferric oxide particles
Assignee: WR Grace and Co
•
Filing: 1962-06-19
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Granted: 1965-08-03
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Expires: 1982-06-19
Abstract
No abstract record available.
Inventors
- 👤 Robert B Maccallum
- 👤 Forrest R Hurley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:36
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06; B; B82; B82Y; B82Y30/00; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/10; C01P2004/30; C01P2004/32; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A METHOD FOR PRODUCING FERRIC OXIDE PARTICLES COMPRISING PREPARING AN AQUEOUS SOLUTION CONTAINING FERRIS CHLORIDE IN A QUANTITY LESS THAN ABOUT 15 WT. ERCENT, EXPRESSED AS FERRIC OXIDE, AND AMMONIUM ACETATE IN A QUANTITY SUCH THAT THE AMMONIUM ACETATE TO FE MOLE RATIO DOES NOT EXCEED ABOUT 3 TO 1; REFLUXING THE SOLUTION FOR FROM 2 TO 24 HOURS TO INDUCE GOOD JPARTICLE FORMATION; AND SEPARATING AND DRYING THE PARTICLES.
Claim 2
Independent Claim
70 words
A METHOD FOR PRODUCING FERRIC OXIDE PARTICLES COMPRISING PREPARING AN AQUEOUS SOLUTION CONTAINING FERRIS CHLORIDE IN A QUANTITY LESS THAN ABOUT 15 WT. ERCENT, EXPRESSED AS FERRIC OXIDE, AND AMMONIUM ACETATE IN A QUANTITY SUCH THAT THE AMMONIUM ACETATE TO FE MOLE RATIO DOES NOT EXCEED ABOUT 3 TO 1; REFLUXING THE SOLUTION FOR FROM 2 TO 24 HOURS TO INDUCE GOOD JPARTICLE FORMATION; AND SEPARATING AND DRYING THE PARTICLES.
References Cited (Backward Citations)
US2426020A
Cited
US2694656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |