US2825669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing low alloy steel for oil well tubing and tubing thereof
Assignee: Societe des Acieries de Pompey
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Filing: 1955-06-17
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Granted: 1958-03-04
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Expires: 1975-06-17
Abstract
No abstract record available.
Inventors
- 👤 Eugene M Herzog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:52
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/18; C21D6/00; C21D6/002; C21D6/02; C22; C22C; C22C38/00; C22C38/02; C22C38/04; C22C38/18; C22C38/22; C22C38/24; C21D2211/00; C21D2211/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A PROCESS OF TREATING FABRICATED LOW ALLOY STEEL 0.08%-0.20% OF ALUMINUM, 0.6%-5.0% OF CHROMIUM, THE STEP OF SUBJECTING THE SAID FABRICATED ARTICLE TO A SOAKING INTENDED TO PRODUCT A DISPERSION OR A DIFFUSION IN THE MASS OF SAID STEEL OF THE CARBIDES CONTAINED THEREIN TOGETHER WITH THEIR AGGREGATES AND BOUNDARIES, SAID SOAKING BEING EXECUTED ATG A TEMPERATURE LYING SOMEWHAT BELOW THE TEMPERATURE OF TRANSFORMATION OF A-IRON INTO R-IRON, THE SAID SOAKING TEMPERATURE FOR THE ABOVE CONTEMPLATED STEEL RANGE BEING SITUATED AT ABOUT 730 TO 800*C.
Claim 2
Dependent Claim
86 words
IN A PROCESS OF TREATING FABRICATED LOW ALLOY STEEL 0.08%-0.20% OF ALUMINUM, 0.6%-5.0% OF CHROMIUM, THE STEP OF SUBJECTING THE SAID FABRICATED ARTICLE TO A SOAKING INTENDED TO PRODUCT A DISPERSION OR A DIFFUSION IN THE MASS OF SAID STEEL OF THE CARBIDES CONTAINED THEREIN TOGETHER WITH THEIR AGGREGATES AND BOUNDARIES, SAID SOAKING BEING EXECUTED ATG A TEMPERATURE LYING SOMEWHAT BELOW THE TEMPERATURE OF TRANSFORMATION OF A-IRON INTO R-IRON, THE SAID SOAKING TEMPERATURE FOR THE ABOVE CONTEMPLATED STEEL RANGE BEING SITUATED AT ABOUT 730 TO 800*C.
References Cited (Backward Citations)
US1700674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |