US2630393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning and descaling ferrous bodies
Assignee: Individual
•
Filing: 1948-06-25
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Granted: 1953-03-03
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Expires: 1968-06-25
Abstract
No abstract record available.
Inventors
- 👤 Charles B Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:54
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/28; C23G1/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN A METHOD OF DESCALING STAINLESS STEEL ARTICLES, THE STEPS INCLUDING IMMERSING THEM IN A FUSED BATH COMPOSED ALMOST ENTIRELY OF A MIXTURE OF AN ALKALI METAL NITRATE AND AN ALKALI METAL HYDROXIDE WITH AN ADDITION OF FROM .1 TO 3% OF AN ALKALI METAL OXIDE CONTAINING AT LEAST TWO ATOMS OF OXYGEN PER MOLECULE AND EFFECTIVE AS AN OXIDIZING AGENT AT TEMPERATURES BELOW 800* F., AND MAINTAINING SAID BATH AT A TEMPERATURE OF FROM 600 TO 800* F.
Claim 2
Dependent Claim
79 words
IN A METHOD OF DESCALING STAINLESS STEEL ARTICLES, THE STEPS INCLUDING IMMERSING THEM IN A FUSED BATH COMPOSED ALMOST ENTIRELY OF A MIXTURE OF AN ALKALI METAL NITRATE AND AN ALKALI METAL HYDROXIDE WITH AN ADDITION OF FROM .1 TO 3% OF AN ALKALI METAL OXIDE CONTAINING AT LEAST TWO ATOMS OF OXYGEN PER MOLECULE AND EFFECTIVE AS AN OXIDIZING AGENT AT TEMPERATURES BELOW 800* F., AND MAINTAINING SAID BATH AT A TEMPERATURE OF FROM 600 TO 800* F.
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) | 1956-03-02 | 1956-09-01 | 1957-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-02 | 1960-09-01 | 1961-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-02 | 1964-09-01 | 1965-03-03 | $7700.00 | Window Closed / Lapsed |