US2759810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Articles of sintered iron and method of making same
Assignee: Individual
•
Filing: 1951-10-02
•
Granted: 1956-08-21
•
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 02:40
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.
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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 |