US3093498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded alumina articles and process
Assignee: —
•
Filing: —
•
Granted: 1963-06-11
•
Expires: 1980-06-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:07
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/3231; C04B2235/3232; C04B2235/3241; C04B2235/327; C04B2235/3272; C04B2235/60; C04B2235/604; C04B2235/70; C04B2235/72; C04B2235/74; C04B2235/77; C04B2235/78; C04B2235/786; C04B2235/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
PROCESS OF PRODUCING HARD WEAR RESISTANT ARTICLES COMPRISING PROVIDING COMMINUTED ALUMINA WHICH IS AT LEAST 98% ALUMINA AND CONSISTS OF ALUMINA AND UP TO ABOUT 2.0% OXIDES WHICH FORM SOLID SOLUTIONS WITH ALUMINA SELECTED FROM THE GROUP CONSISTING OF THE OXIDES OF GALLIUM, CHROMIUM, TITANIUM, VANADIUM AND MIXTURES THEREOF, AT LEAST 99.88%, MOLDING SAID ALUMINA, THEN PRESSING SAID ALUMINA UNDER A PRESSURE OF AT LEAST 500 POUNDS PER SQUAARE INCH AT A TEMPERATURE BETWEEN ABOUT 1400 AND 1800*C. AND FOR A TIME EFFECTIVE TO FORM THE ALUMINA WITH A DENSITY BETWEEN 3.95 AND 4.05 GRAMS PER CUBIC CENTIMETER AND AT LEAST 80% AS A CRYSTALLINE MATRIX WITH AVERAGE CRYSTAL SIZE OF FROM ONE-HALF MICRON TO TEN MICRONS.
Claim 2
Dependent Claim
117 words
PROCESS OF PRODUCING HARD WEAR RESISTANT ARTICLES COMPRISING PROVIDING COMMINUTED ALUMINA WHICH IS AT LEAST 98% ALUMINA AND CONSISTS OF ALUMINA AND UP TO ABOUT 2.0% OXIDES WHICH FORM SOLID SOLUTIONS WITH ALUMINA SELECTED FROM THE GROUP CONSISTING OF THE OXIDES OF GALLIUM, CHROMIUM, TITANIUM, VANADIUM AND MIXTURES THEREOF, AT LEAST 99.88%, MOLDING SAID ALUMINA, THEN PRESSING SAID ALUMINA UNDER A PRESSURE OF AT LEAST 500 POUNDS PER SQUAARE INCH AT A TEMPERATURE BETWEEN ABOUT 1400 AND 1800*C. AND FOR A TIME EFFECTIVE TO FORM THE ALUMINA WITH A DENSITY BETWEEN 3.95 AND 4.05 GRAMS PER CUBIC CENTIMETER AND AT LEAST 80% AS A CRYSTALLINE MATRIX WITH AVERAGE CRYSTAL SIZE OF FROM ONE-HALF MICRON TO TEN MICRONS.
References Cited (Backward Citations)
US2502198A
Cited
US2538959A
Cited
US2630617A
Cited
US2618567A
Cited
US2810182A
Cited
US2947056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |