Patent US2759810A successfully refreshed from Google Patents.
US2759810A
Expired / Lapsed
US
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Articles of sintered iron and method of making same
Assignee: Individual
•
Filing: 1951-10-02
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Granted: 1956-08-21
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Expires: 1971-10-02
Abstract
No abstract record available.
Inventors
- 👤 Koehler Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:48
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A METHOD OF MAKING HOLLOW AND SOLID ARTICLES, WHICH INCLUDES THE STEPS OF ADDING TO IRON POWDER APPROXIMATELY 1% BY WEIGHT OF GRAPHITE AND APPROXIMATELY 5% BY WEIGHT OF LEAD POWDER, COMPRESSING THE THUS OBTAINED MIXTURES AT A PRESSURE OF APPROXIMATELY 5 TONS PER SQ. CENTIMETER, SINTERING THE THUS COMPRESSED MATERIAL AT SUBSTANTIALLY 1100* CENTIGRADE FOR A PERIOD OF APPROXIMATELY 3 HOURS, THEREBY PRODUCING A BILLET, AND EXTRUSION PRESSING THE SAID BILLET INTO AN ARTICLE OF DESIRED SHAPE.
Claim 2
Independent Claim
78 words
A METHOD OF MAKING HOLLOW AND SOLID ARTICLES, WHICH INCLUDES THE STEPS OF ADDING TO IRON POWDER APPROXIMATELY 1% BY WEIGHT OF GRAPHITE AND APPROXIMATELY 5% BY WEIGHT OF LEAD POWDER, COMPRESSING THE THUS OBTAINED MIXTURES AT A PRESSURE OF APPROXIMATELY 5 TONS PER SQ. CENTIMETER, SINTERING THE THUS COMPRESSED MATERIAL AT SUBSTANTIALLY 1100* CENTIGRADE FOR A PERIOD OF APPROXIMATELY 3 HOURS, THEREBY PRODUCING A BILLET, AND EXTRUSION PRESSING THE SAID BILLET INTO AN ARTICLE OF DESIRED SHAPE.
References Cited (Backward Citations)
US2123416A
Cited
US1822939A
Cited
US1775358A
Cited
US1896939A
Cited
US2097502A
Cited
US2045786A
Cited
US2148040A
Cited
US2187086A
Cited
US2214104A
Cited
US2182759A
Cited
US2225902A
Cited
US2299192A
Cited
US2225424A
Cited
US2327805A
Cited
US2353951A
Cited
US2422439A
Cited
US2452628A
Cited
US2477601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |