Patent US3623919A successfully refreshed from Google Patents.
US3623919A
Expired / Lapsed
US
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Method for treating the surface of a ferrous material
Assignee: Toyota Central R&D Labs Inc
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Filing: 1969-05-06
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Granted: 1971-11-30
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Expires: 1989-05-06
Abstract
Abstract PERATURE HEAT TREATMENT WHICH DISPERSES THE IODINE IN THE SURFACE LAYER AND CAUSES GREATER PENETRATION. A METHOD FOR TREATING THE SURFACE OF A FERROUS MATERIAL COMPRISING POLISH-DEOILING SAID SURFACE, AND IMMERSING THE MATERIAL AT ROOM TEMPERATURE IN AN IODINE-BEARING ATMOSPLHERE WHICH MAY BE GASEOUS, OR LIQUID TO FORM A TREATED SURFACE LAYER HAVING EXCELLENT RESISTANCE TO SEIZURE AND WHICH INHIBITS PEELING. THE RESISTANCE TO SEIZURE OF THE TREATED SURFACE MAY BE FURTHER IMPROVED BY LOW TEM-
Inventors
- 👤 Hisami Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:11
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/40; C23C8/42; C23C22/00; C23C8/06; C23C8/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |