US2905577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Creep resistant chromium steel
Assignee: Birmingham Small Arms Co Ltd
•
Filing: 1956-01-05
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Granted: 1959-09-22
•
Expires: 1976-01-05
Abstract
No abstract record available.
Inventors
- 👤 Geoffrey T Harris
- 👤 Henry C Child
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A NORMALLY NON-HARDENABLE CHLORMIUM STEEL CONTAINING AT LEAST 60% FERRITE AT 1000*-1300*C., AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF 0-6% MOLYBDENUM, 0-6% TUNGSTEN AND 0-2% VANADIUM WHEREIN THE ELEMENTS ARE PRESENT IN A TOTAL AMOUNT OF AT LEAST 1.5% FOR THE PURPOSE OF SOLUTION TREATMENT WHEREIN SAID STEEL HAS BEEN TREATED TO IMPROVE CREEP STRENGTH BY THE STEPS COMPRISING SOLUTION TREATING THE STEEL AT A TEMPERATURE IN THE RANGE OF 1000*-1300*C., QUENCHING THE STEEL FOR THE PURPOSE OF EFFECTING SOLUTION TREATMENT THEREOF AND WORKING THE STEEL AT A TEMPERATURE WITHIN THE TEMPERATURE RANGE OF 20*-700*C. TO REDUCE THE THICKNESS THEREOF SUBSTANTIALLY 1%-10%.
Claim 2
Dependent Claim
105 words
A NORMALLY NON-HARDENABLE CHLORMIUM STEEL CONTAINING AT LEAST 60% FERRITE AT 1000*-1300*C., AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF 0-6% MOLYBDENUM, 0-6% TUNGSTEN AND 0-2% VANADIUM WHEREIN THE ELEMENTS ARE PRESENT IN A TOTAL AMOUNT OF AT LEAST 1.5% FOR THE PURPOSE OF SOLUTION TREATMENT WHEREIN SAID STEEL HAS BEEN TREATED TO IMPROVE CREEP STRENGTH BY THE STEPS COMPRISING SOLUTION TREATING THE STEEL AT A TEMPERATURE IN THE RANGE OF 1000*-1300*C., QUENCHING THE STEEL FOR THE PURPOSE OF EFFECTING SOLUTION TREATMENT THEREOF AND WORKING THE STEEL AT A TEMPERATURE WITHIN THE TEMPERATURE RANGE OF 20*-700*C. TO REDUCE THE THICKNESS THEREOF SUBSTANTIALLY 1%-10%.
References Cited (Backward Citations)
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Cited
US2397997A
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US2469887A
Cited
US2693413A
Cited
GB722809A
Cited
US2793113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |