US2729096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for determining the fatigue endurance limit of solids, especially metals
Assignee: Rensselaer Polytechnic Institute
•
Filing: 1951-10-16
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Granted: 1956-01-03
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Expires: 1971-10-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Rosenholtz
- 👤 Dudley T Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:44
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N2203/00; G01N2203/02; G01N2203/022; G01N2203/0222; G01N2203/0226
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
THE METHOD OF DETERMINING THE ENDURANCE LIMIT OF A SOLID MATERIAL WHEN SUBJECTED TO A DEFINITE TYPE FATIGUE STRESS OR COMBINATIONS OF DEFINITE TYPES OF FATIGUE STRESSES, WHICH COMPRISES, PREPARING A PLURALITY OF SUBSTANTIALLY INDENTICAL TEST SPECIMENS OF THE MATERIAL, SUBJECTING SAID SPECIMENS WITHOUT RUPTURING THE SAME TO SUBSTANTIALLY THE SAME NUMBER OF REVERSED CYCLES OF FATIGUE STRESS OF THE TYPE DETERMINED, EACH OF THE SPECIMENS BEING SUBJECTED TO A DIFFERENT VALUE OF STRESS OF SAID TYPE, THE STRESSES APPLIED BEING ARRANGED IN AN INCREASING INCREMENTAL MANNER FROM THE SPECIMEN TO THE NEXT, AND THEREAFTER MEASURING THE VALUE OF A PHYSICAL PROPERTY WHICH IS COMMON TO ALL SPECIMENS AND WHICH IS RESPONSIVE TO THE VARYING FATIGUE VALUE OF THE MEASURED PROPERTY OF WHICH DECREASES TO THE MINIMUN POINT OF THE INCREMENTAL SERIES AND THEN INCREASES BEYOND SUCH MINIMUM VALUE, BEING THE DESIRED ENDURANCE LIMIT OF THE MATERIAL.
Claim 2
Independent Claim
147 words
THE METHOD OF DETERMINING THE ENDURANCE LIMIT OF A SOLID MATERIAL WHEN SUBJECTED TO A DEFINITE TYPE FATIGUE STRESS OR COMBINATIONS OF DEFINITE TYPES OF FATIGUE STRESSES, WHICH COMPRISES, PREPARING A PLURALITY OF SUBSTANTIALLY INDENTICAL TEST SPECIMENS OF THE MATERIAL, SUBJECTING SAID SPECIMENS WITHOUT RUPTURING THE SAME TO SUBSTANTIALLY THE SAME NUMBER OF REVERSED CYCLES OF FATIGUE STRESS OF THE TYPE DETERMINED, EACH OF THE SPECIMENS BEING SUBJECTED TO A DIFFERENT VALUE OF STRESS OF SAID TYPE, THE STRESSES APPLIED BEING ARRANGED IN AN INCREASING INCREMENTAL MANNER FROM THE SPECIMEN TO THE NEXT, AND THEREAFTER MEASURING THE VALUE OF A PHYSICAL PROPERTY WHICH IS COMMON TO ALL SPECIMENS AND WHICH IS RESPONSIVE TO THE VARYING FATIGUE VALUE OF THE MEASURED PROPERTY OF WHICH DECREASES TO THE MINIMUN POINT OF THE INCREMENTAL SERIES AND THEN INCREASES BEYOND SUCH MINIMUM VALUE, BEING THE DESIRED ENDURANCE LIMIT OF THE MATERIAL.
References Cited (Backward Citations)
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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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |