Patent US3158472A successfully refreshed from Google Patents.
US3158472A
Expired / Lapsed
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Process for producing sintered articles
Assignee: Huettenwerk Oberhausen AG
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Filing: 1961-10-19
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Granted: 1964-11-24
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Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 Bogdandy Ludwig Von
- 👤 Stranski Iwan Nikola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:58
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A PROCESS FOR PRODUCING A SINTERED ARTICLE FROM A COARSE-GRAIN AND A FINE-GRAIN FRACTION OF IRON POWDER, THE BULK OF SAID COARSE-GRAIN FRACTION CONSISTING OF PARTICLES GREATER THAN 0.1 MM. IN DIAMETER, THE BULK OF SAID FINE-GRAIN FRACTION CONSISTING OF PARTICLES LESS THAN 0.1 MM. IN DIAMETER, COMPRISING THE STEPS F INCREASING THE INTERNAL STRESSES OF THE PARTICLES OF SAID FINE-GRAIN FRACTION RELATIVELY TO THOSE OF THE PARTICLES OF SAID COARSEGRAIN FRACTION BY MECHANICALLY COMPACTING THE PARTICLES OF SAID FINE-GRAIN FRACTION, RECOMMINUTING SAID FINE-GRAIN FRACTION TO SUBSTANTIALLY ITS ORIGINAL PARTICLE SIZE, MIXING A MAJOR PROPORTION OF SAID COARSE-GRAIN FRACTION WITH A MINOR PROPORTION OF SAID FINE-GRAIN FRACTION, SAID MINOR FRACTION CONSTITUTING BETWEEN SUBSTANTIALLY 5% AND 40% BY WEIGHT OF THE MIXTURE, MOLDING THE MIXTURE INTO A BLANK OF AN ARTICLE TO BE PRODUCED, AND SINTERING SAID BLANK.
Claim 2
Dependent Claim
137 words
A PROCESS FOR PRODUCING A SINTERED ARTICLE FROM A COARSE-GRAIN AND A FINE-GRAIN FRACTION OF IRON POWDER, THE BULK OF SAID COARSE-GRAIN FRACTION CONSISTING OF PARTICLES GREATER THAN 0.1 MM. IN DIAMETER, THE BULK OF SAID FINE-GRAIN FRACTION CONSISTING OF PARTICLES LESS THAN 0.1 MM. IN DIAMETER, COMPRISING THE STEPS F INCREASING THE INTERNAL STRESSES OF THE PARTICLES OF SAID FINE-GRAIN FRACTION RELATIVELY TO THOSE OF THE PARTICLES OF SAID COARSEGRAIN FRACTION BY MECHANICALLY COMPACTING THE PARTICLES OF SAID FINE-GRAIN FRACTION, RECOMMINUTING SAID FINE-GRAIN FRACTION TO SUBSTANTIALLY ITS ORIGINAL PARTICLE SIZE, MIXING A MAJOR PROPORTION OF SAID COARSE-GRAIN FRACTION WITH A MINOR PROPORTION OF SAID FINE-GRAIN FRACTION, SAID MINOR FRACTION CONSTITUTING BETWEEN SUBSTANTIALLY 5% AND 40% BY WEIGHT OF THE MIXTURE, MOLDING THE MIXTURE INTO A BLANK OF AN ARTICLE TO BE PRODUCED, AND SINTERING SAID BLANK.
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) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |