Patent US3142894A successfully refreshed from Google Patents.
US3142894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered metal article and method of making same
Assignee: Old Carco LLC
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Filing: 1962-08-31
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Granted: 1964-08-04
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Expires: 1982-08-31
Abstract
No abstract record available.
Inventors
- 👤 Stuart T Ross
- 👤 Walter E Jominy
- 👤 Frederick A Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:38
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0207; C22C33/0228
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
IN A PROCESS OF PRODUCING SINTERED POWDERED FERROUS PRODUCTS HAVING SUBSTANTIAL DIMENSIONAL STABILITY UNDER SERVICE CONDITIONS AT TEMPERATURES UP TO ABOUT 1200* F. THE STEPS COMPRISING BRIQUETTING A COMPOSITION CONTAINING AT LEAST ABOUT 79% BY WEIGHT OF FERROUS POWDER PARTICLES INTO A PREDETERMINED SHAPE CAPABLE OF BEING HANDLED, SINTERING THE BRIQUETTES IN A REDUCING ATMOSPHERE AT A TEMPERATURE SUFFICIENTLY HIGH TO CAUSE THE FERROUS PARTICLES TO BOND TOGETHER AND PRODUCE A RELATIVELY DENSE IRON PARTICLE STRUCTURE, COOLING THE SINTERED PRODUCT IN A REDUCING ATMOSPHERE AND DURING PROCESSING SUBSTANTIALLY UNIFORMLY COOLING THE SINTERED PRODUCT IN AN OXIDIZING ATMOSPHERE FROM A TEMPERATURE BETWEEN 1050*F. TO 2150*F. AT A RATE NOT EXCEEDING ABOUT 500*F. PER HOUR.
Claim 2
Dependent Claim
113 words
IN A PROCESS OF PRODUCING SINTERED POWDERED FERROUS PRODUCTS HAVING SUBSTANTIAL DIMENSIONAL STABILITY UNDER SERVICE CONDITIONS AT TEMPERATURES UP TO ABOUT 1200* F. THE STEPS COMPRISING BRIQUETTING A COMPOSITION CONTAINING AT LEAST ABOUT 79% BY WEIGHT OF FERROUS POWDER PARTICLES INTO A PREDETERMINED SHAPE CAPABLE OF BEING HANDLED, SINTERING THE BRIQUETTES IN A REDUCING ATMOSPHERE AT A TEMPERATURE SUFFICIENTLY HIGH TO CAUSE THE FERROUS PARTICLES TO BOND TOGETHER AND PRODUCE A RELATIVELY DENSE IRON PARTICLE STRUCTURE, COOLING THE SINTERED PRODUCT IN A REDUCING ATMOSPHERE AND DURING PROCESSING SUBSTANTIALLY UNIFORMLY COOLING THE SINTERED PRODUCT IN AN OXIDIZING ATMOSPHERE FROM A TEMPERATURE BETWEEN 1050*F. TO 2150*F. AT A RATE NOT EXCEEDING ABOUT 500*F. PER HOUR.
Claim 3
Dependent Claim
95 words
AS AN ARTICLE OF MANUFACTURE, A SINTERED POWDERED METAL PRODUCT FOR A SEAL OR BEARING OPERABLE AT ELEVATED TEMPERATURE UP TO 1200*F. AND HAVING SUBSTANTIAL DIMENSIONAL STABILITY WHEN EXPOSED TO SAID ELEVATED TEMPERATURES COMPRISING A COMPACTED AND SINTERED MATRIX OF BONDED FERROUS PARTICLES HAVING AN OXIDIZED GRAIN STRUCTURE WHICH IS CHARACTERIZED BY THE APPEARANCE OF SUBSTANTIAL AMOUNTS OF IRON OXIDE FROM THE GROUP CONSISTING OF MAGNETITE, WUSTITE AND HEMATITE AND MIXTURES THEREOF BETWEEN AND AROUND THE PARTICLES OF FERRITE AND PEARLITE FROM THE GROUP CONSISTING OF PARTIALLY DECARBURIZED PEARLITE AND SPHEROIDIZED PEARLITE AND MIXTURES THEREOF.
Claim 4
Dependent Claim
95 words
AS AN ARTICLE OF MANUFACTURE, A SINTERED POWDERED METAL PRODUCT FOR A SEAL OR BEARING OPERABLE AT ELEVATED TEMPERATURE UP TO 1200*F. AND HAVING SUBSTANTIAL DIMENSIONAL STABILITY WHEN EXPOSED TO SAID ELEVATED TEMPERATURES COMPRISING A COMPACTED AND SINTERED MATRIX OF BONDED FERROUS PARTICLES HAVING AN OXIDIZED GRAIN STRUCTURE WHICH IS CHARACTERIZED BY THE APPEARANCE OF SUBSTANTIAL AMOUNTS OF IRON OXIDE FROM THE GROUP CONSISTING OF MAGNETITE, WUSTITE AND HEMATITE AND MIXTURES THEREOF BETWEEN AND AROUND THE PARTICLES OF FERRITE AND PEARLITE FROM THE GROUP CONSISTING OF PARTIALLY DECARBURIZED PEARLITE AND SPHEROIDIZED PEARLITE AND MIXTURES THEREOF.
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |