US3859085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing iron-base sintered alloys with high density
Assignee: Toyota Central R&D Labs Inc
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Filing: 1972-07-06
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Granted: 1975-01-07
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Expires: 1992-07-06
Abstract
Abstract Iron-base sintered alloys, characterized by high density and good hardness, have been prepared by sintering a particulate material consisting of iron, carbon and metallic carbide at a temperature within the solid-liquid phase range corresponding to the composition ratio of said iron and carbon.
Inventors
- 👤 Takashi Kimura
- 👤 Azusa Majima
- 👤 Hiroshi Hamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:06
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292; B; B22; B22F; B22F3/00; B22F3/12; B22F3/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A METHOD FOR PRODUCING A HIGH DENSITY, HIGH HARDNESS SINTERED IRON-BASE ALLOY WHICH COMPRISES: HEATING A MIXTURE OF PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF MIXED PARTICLES OF IRON, CARBON AND METALLIC-CARBIDE PARTICLES, AND MIXED PARTICLES OF AN IRONCARBON ALLOY PARTICLES AND METALLIC PARTICLES, SAID METALLIC CARBIDE BEING SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN CARBIDE, MOLYBDENUM CARBIDE, MANGANESE CARBIDE, CHROMIUM CARBIDE, TITANIUM CARBIDE, VANADIUM CARBIDE, NIOBIUM CARBIDE, TANTALUM CARBIDE, BORON CARBIDE, AND MIXTURES THEREOF, AT A TEMPERATURE WITHIN THE RANGE OF THE SOLID-LIQUID PHASE OF THE RESULTING ALLOY, SAID SINTERING TEMPERATURE BEING LOWER THAN THE MELTING POINTS OF ANY OF SAID STARTING PARTICLES,
Claim 2
Independent Claim
105 words
A METHOD FOR PRODUCING A HIGH DENSITY, HIGH HARDNESS SINTERED IRON-BASE ALLOY WHICH COMPRISES: HEATING A MIXTURE OF PARTICULATE MATERIAL SELECTED FROM THE GROUP CONSISTING OF MIXED PARTICLES OF IRON, CARBON AND METALLIC-CARBIDE PARTICLES, AND MIXED PARTICLES OF AN IRONCARBON ALLOY PARTICLES AND METALLIC PARTICLES, SAID METALLIC CARBIDE BEING SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN CARBIDE, MOLYBDENUM CARBIDE, MANGANESE CARBIDE, CHROMIUM CARBIDE, TITANIUM CARBIDE, VANADIUM CARBIDE, NIOBIUM CARBIDE, TANTALUM CARBIDE, BORON CARBIDE, AND MIXTURES THEREOF, AT A TEMPERATURE WITHIN THE RANGE OF THE SOLID-LIQUID PHASE OF THE RESULTING ALLOY, SAID SINTERING TEMPERATURE BEING LOWER THAN THE MELTING POINTS OF ANY OF SAID STARTING PARTICLES,
Claim 3
Dependent Claim
15 words
The method of claim 1, wherein pressure is applied to said particulate material during sintering.
Claim 4
Dependent Claim
25 words
The method of claim 1, wherein the particulate material is sintered in a suitable mold, and the sintered product is subsequently removed from said mold.
Claim 5
Dependent Claim
14 words
The method of claim 3, wherein said mold is formed from a ceramic material.
Claim 6
Dependent Claim
14 words
The method of claim 1, wherein said carbon is in the form of graphite.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |