Patent US1841309A successfully refreshed from Google Patents.
US3671297A
Expired / Lapsed
US
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Method of chromizing in a fused salt bath
Assignee: Toyota Central R&D Labs Inc
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Filing: 1971-03-02
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Granted: 1972-06-20
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Expires: 1991-03-02
Abstract
Abstract A METHOD OF TREATING METALS AND ALLOYS IN WHICH A FUSED SALT BATH CONSISTING OF AT LEAST ONE BORON-CONTAINING SALT SUCH AS BORON OXIDE (B2O3) OR BORAX (NA2B4O7), AND A CHROMIUM-CONTAINING MATERIAL IS PREPARED AND A MATERIAL TO BE TREATED IS IMMERSED IN THE FUSED SALT BATH AS A RESULT OF WHICH A CHROMIUM-IMPREGNATED LAYER WITH FINE STRUCTURE AND WITH EXCELLENT RESISTANCE TO CORROSION, OXIDATION AND WEAR IS FORMED AT THE SURFACE OF THE METAL.
Inventors
- 👤 Noboru Komatsu
- 👤 Tohur Arai
- 👤 Masayoshi Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:55
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/18; C23C10/20; C23C10/24
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |