Patent US3155502A successfully refreshed from Google Patents.
US3155502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder metallurgy
Assignee: Union Carbide Corp
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Filing: 1960-08-12
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Granted: 1964-11-03
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Expires: 1980-08-12
Abstract
No abstract record available.
Inventors
- 👤 Harry J Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:43
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0094; B; B22; B22F; B22F3/00; B22F3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A METHOD OF MAKING DENSE, CRACK-FREE AND DISTORTION-FREE ARTICLES OF SINTERABLE NORMALLY BRITTLE AND HARDTO-WORK REFRACTORY MATERIALS COMPRISING PREPARING A BLENDED DAMP, POWDERY MIXTURE OF NEARLY FREE-FLOWING CONSISTENCY CONSISTING ESSENTIALLY OF FROM ABOUT 83 PERCENT BY WEIGHT TO ABOUT 95.6 PERCENT BY WEIGHT OF THE POWDERED SINTERABLE REFRACTORY MATERIAL HAVING A PARTICLE SIZE OF FROM 1.5 TO 10 MICRONS, FROM ABOUT 2 PERCENT TO ABOUT 8 PERCENT BY WEIGHT OF A WATER-SOLUBLE STEARATE, COMPACTNG SAID POWDERY MIXTURE UNDER PRESSURE TO PRODUCE A COMPACT THEREOF HAVING A GREEN DENSITY OF FROM 30 PERCENT TO 65 PERCENT OF THE THEORETICAL DENSITY AND A GREEN STRENGTH OF FROM 5 P.S.I. TO 500 P.S.I., COLD-ROLLING SAID COMPACT AT AMBIENT TEMPERATURES AND LOW PRESSURES TO REDUCE THE THICKNESS THEREOF AT LEAST 80 PERCENT, THEREBY PRODUCING A THIN SHEET FROM SAID CMPACT, AND SINTERING SAID SHEET IN AN INERT ATMOSPHERE.
Claim 2
Independent Claim
144 words
A METHOD OF MAKING DENSE, CRACK-FREE AND DISTORTION-FREE ARTICLES OF SINTERABLE NORMALLY BRITTLE AND HARDTO-WORK REFRACTORY MATERIALS COMPRISING PREPARING A BLENDED DAMP, POWDERY MIXTURE OF NEARLY FREE-FLOWING CONSISTENCY CONSISTING ESSENTIALLY OF FROM ABOUT 83 PERCENT BY WEIGHT TO ABOUT 95.6 PERCENT BY WEIGHT OF THE POWDERED SINTERABLE REFRACTORY MATERIAL HAVING A PARTICLE SIZE OF FROM 1.5 TO 10 MICRONS, FROM ABOUT 2 PERCENT TO ABOUT 8 PERCENT BY WEIGHT OF A WATER-SOLUBLE STEARATE, COMPACTNG SAID POWDERY MIXTURE UNDER PRESSURE TO PRODUCE A COMPACT THEREOF HAVING A GREEN DENSITY OF FROM 30 PERCENT TO 65 PERCENT OF THE THEORETICAL DENSITY AND A GREEN STRENGTH OF FROM 5 P.S.I. TO 500 P.S.I., COLD-ROLLING SAID COMPACT AT AMBIENT TEMPERATURES AND LOW PRESSURES TO REDUCE THE THICKNESS THEREOF AT LEAST 80 PERCENT, THEREBY PRODUCING A THIN SHEET FROM SAID CMPACT, AND SINTERING SAID SHEET IN AN INERT ATMOSPHERE.
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) | 1967-11-03 | 1968-05-04 | 1968-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-03 | 1972-05-04 | 1972-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-03 | 1976-05-04 | 1976-11-03 | $7700.00 | Window Closed / Lapsed |