US3723209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for increasing wear resistance of a rubbing surface of aluminuum alloy articles
Assignee: Resonac Holdings Corp
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Filing: 1971-04-13
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Granted: 1973-03-27
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Expires: 1991-04-13
Abstract
Abstract A METHOD FOR EFFECTIVELY INCREASING WEAR RESISTANCE OF A RUBBING SURFACE OF ALUMINUM ALLOY ARTICLES WHICH COMPRISES MACHINING SAID RUBBING SURFACE OF A CAST ALUMINUM ALLOY ARTICLE IN WHICH THERE ARE DISPERSED FINE PARTICLES OF MAGNESIUM SILICIDE OR LEAD DICHLORIDE HOMOGENEOUSLY SO AS TO EXPOSE SOME OF SAID PARTICLES ON THE RUBBING SURFACES, AND WASHING OUT THE EXPOSED SILICIDE OR DICHLORIDE FROM THE SURFACE LAYER WITH AN INORGANIC ACID SOLUTION SO AS TO LEAVE FINE EXPOSED HOLLOWS IN THE RUBBING SURFACE LAVER AS OIL POOLS.
Inventors
- 👤 T Sekiguchi
- 👤 A Hamada
- 👤 Y Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:57
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/02; C22C1/00; C22C1/10; C22C1/1036; Y; Y10; Y10T; Y10T428/00; Y10T428/31
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |