US3264124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ultra-fine alpha alumina and such alpha alumina
Assignee: Honeywell International Inc
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Filing: 1963-11-21
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Granted: 1966-08-02
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Expires: 1983-11-21
Abstract
No abstract record available.
Inventors
- 👤 William B Lauder
- 👤 Raymond L Copson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:39
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/38; C01B; C01B21/00; C01B21/082; C01B21/083; C01B21/084; C01B21/0842; C01B21/0846; C01B7/00; C01B7/01; C01B7/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE PROCESS OF PRODUCING ALPHA ALUMINA WHICH COMPRISES REACTING ALUMINUM CHLORIDE IN THE VAPOR PHASE UNDER ANHYDROUS CONDITIONS WITH NITROGEN DIOXIDE AT A TEMPERATURE WITHIN THE RANGE OF FROM 175* TO 500*C. IN AT LEAST ABOUT THE STOICHIOMETRIC PROPORTIONS FOR THE REACTION BETWEEN THE ALUMINUM CHLORIDE AND NITROGEN DIOXIDE TO FORM ALUMINUM OXIDE, SEPARATING THE SOLID REACTION PRODUCT CONSISTING ESSENTIALLY OF A MIXTURE OF ALUMINUM OXIDE AND ALUMINUM OXYCHLORIDE FROM THE GASEOUS REACTION PRODUCTS, AND HEATING THE SEPARATED SOLID REACTION PRODUCT TO A TEMPERATURE OF AT LEAST ABOUT 1100*C. TO PRODUCE ALPHA ALUMINA.
Claim 2
Dependent Claim
44 words
THE ALPHA ALUMINA PRODUCED BY THE PROCESS OF CLAIM 5 HAVING A PARTICLE SIZE NOT EXCEEDING 5 MICRONS, A SURFACE AREA OF ABOUT 6.2 SQUARE METERS PER GRAM, A BULK DENSITY OF ABOUT 0.208 G./CC. AND BEING CAPABLE TO ADSORBING DYESTUFFS FROM AQUEOUS SOLUTIONS.
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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |