Patent US6018652A successfully refreshed from Google Patents.
Patent US2860044A successfully refreshed from Google Patents.
US2860044A
Expired / Lapsed
US
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Method in the production of iron powder of desired grain size
Assignee: Hoganas Billesholms AB
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Filing: 1951-02-20
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Granted: 1958-11-11
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Expires: 1971-02-20
Abstract
No abstract record available.
Inventors
- 👤 Nils H Brundin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:02
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/22; B; B22; B22F; B22F9/00; C; C21; C21B; C21B13/00; C21B13/0086
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
55 words
A METHOD FOR THE PRODUCTION OF IRON POWDER OF ABOUT 100 MESH AND SUITABLE FOR POWER METALLURGY WHICH COMPRISES MECHANICALLY REDUCING IRON ORE OF GREATER PARTICLE SIZE TO NOT GREATER THAN ABOUT 100 MESH, CHEMICALLY REDUCING THE RESULTING ORE AT A TEMPERATURE SUFFICIENT TO PRODUCE SPONGE IRON IN THE FORM OF A HARD, SINTERED CAKE
References Cited (Backward Citations)
US2216770A
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US2200491A
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US2252697A
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US2279013A
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GB568786A
Cited
US2402120A
Cited
US2413492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |