US2679466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface decarburization of carboncontaining alloys
Assignee: Union Carbide Corp
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Filing: 1952-04-16
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Granted: 1954-05-25
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Expires: 1972-04-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard R Spendelow
- 👤 Robert M Fowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:53
CPC Classifications
C; C21; C21D; C21D3/00; C21D3/02; C21D3/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944; Y10T428/12951; Y10T428/12958
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD OF LOWERING THE CARBON CONTENT OF AT LEAST THE SURFACE PORTIONS OF AN ARTICLE COMPOSED OF A CARBON-CONTAINING ALLOY WHICH METHOD COMPRISES HEATING SUCH ARTICLE FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE A RELATIVELY THIN SKIN OF SUBSTANTIALLY CARBONLESS METAL AT A TEMPERATURE UPWARDS OF 1050* C. AND SUBJECTING SUCH HEATED ARTICLE TO THE ACTION OF A HYDROGEN-HYDROGEN CHLORIDE ATMOSPHERE CONTAINING BETWEEN 3%
Claim 2
Independent Claim
66 words
A METHOD OF LOWERING THE CARBON CONTENT OF AT LEAST THE SURFACE PORTIONS OF AN ARTICLE COMPOSED OF A CARBON-CONTAINING ALLOY WHICH METHOD COMPRISES HEATING SUCH ARTICLE FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE A RELATIVELY THIN SKIN OF SUBSTANTIALLY CARBONLESS METAL AT A TEMPERATURE UPWARDS OF 1050* C. AND SUBJECTING SUCH HEATED ARTICLE TO THE ACTION OF A HYDROGEN-HYDROGEN CHLORIDE ATMOSPHERE CONTAINING BETWEEN 3%
References Cited (Backward Citations)
US2199418A
Cited
US2437528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |