US2738294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Salt bath system and method for treating metals
Assignee: Diamond Shamrock Corp
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Filing: 1951-09-13
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Granted: 1956-03-13
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Expires: 1971-09-13
Abstract
No abstract record available.
Inventors
- 👤 Harry R Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:21
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/44; C21D1/46; C23; C23G; C23G1/00; C23G1/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
IN A SALT BATH SYSTEM, A COMPOSITION CONSISTING ESSENTIALLY OF, SODIUM HYDROXIDE FROM ABOUT 70% TO ABOUT 98%, POTASSIUM HYDROXIDE FROM ABOUT 0.5% TO ABOUT 12% AND THE BALANCE SUBSTANTIALLY AN ALKALINE EARTH METAL HALIDE.
Claim 2
Dependent Claim
35 words
IN A SALT BATH SYSTEM, A COMPOSITION CONSISTING ESSENTIALLY OF, SODIUM HYDROXIDE FROM ABOUT 70% TO ABOUT 98%, POTASSIUM HYDROXIDE FROM ABOUT 0.5% TO ABOUT 12% AND THE BALANCE SUBSTANTIALLY AN ALKALINE EARTH METAL HALIDE.
Claim 3
Dependent Claim
65 words
IN A METHOD FOR METAL TREATMENT BY AN ANHYDROUS SALT BATH SYSTEM, THE STEPS COMPRISING, IMMERSING WORK OF METAL HAVING A SURFACE TO BE CLEANED IN A FUSED COMPOSITION CONSISTING ESSENTIALLY OF SODIUM HYDROXIDE AS THE PREPONDERANT INGREDIENT, POTASSIUM HYDROXIDE AND AN ALKALINE EARTH METAL HALIDE AT A TEMPERATURE BETWEEN ABOUT 650* F. AND ABOUT 1350* F. FOR A SUFFICIENT TIME TO CLEAN SAID SURFACE.
Claim 4
Dependent Claim
65 words
IN A METHOD FOR METAL TREATMENT BY AN ANHYDROUS SALT BATH SYSTEM, THE STEPS COMPRISING, IMMERSING WORK OF METAL HAVING A SURFACE TO BE CLEANED IN A FUSED COMPOSITION CONSISTING ESSENTIALLY OF SODIUM HYDROXIDE AS THE PREPONDERANT INGREDIENT, POTASSIUM HYDROXIDE AND AN ALKALINE EARTH METAL HALIDE AT A TEMPERATURE BETWEEN ABOUT 650* F. AND ABOUT 1350* F. FOR A SUFFICIENT TIME TO CLEAN SAID SURFACE.
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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) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |