US3136154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fatigue monitor
Assignee: Douglas Aircraft Co Inc
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Filing: 1958-11-20
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Granted: 1964-06-09
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Expires: 1978-11-20
Abstract
No abstract record available.
Inventors
- 👤 Roy H Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:15
CPC Classifications
G; G01; G01M; G01M5/00; G01M5/0033; G01M5/0041; G01M5/0083; G01N; G01N3/00; G01N3/02; G01N3/06; G01N3/066; G01N2203/00; G01N2203/02; G01N2203/026; G01N2203/0262; G01N2203/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
213 words
MEANS FOR MONITORING FATIGUE OF STRUCTURAL ELEMENTS WHICH ARE SUBJECTED TO DIVERS AND VARIOUS LOADS, INCLUDING REVERSED LOADS, COMPRISING: AN ELONGATE STRIP OF MATERIAL HAVING A UNIFORM THICKNESS AND INCLUDING A PLURALITY OF STRIP-MOUNTING AREAS AND A PLURALITY OF LONGITUDINALLY ALIGNED, COUPONS EACH WITH A NECKED DOWN PORTION, EACH ONE OF SAID COUPONS BEING DISPOSED BETWEEN AN ADJACENT PAIR OF SAID AREAS, MEANS FOR ATTACHING THE MOUNTING AREAS OF THE STRIP TO THE ELEMENT TO BE MONITORED; AND EACH COUPON HAVING AN APERTURE CENTRALLY THEREOF INTERMEDIATE ITS END-PORTIONS FOR MAGNIFYING THE STRESS DEVELOPED IN THE COUPON WHEN THE STRIP IS IN USE; THE RATIO OF THE CROSS-SECTIONAL AREA OF THE NECKED-DOWN PORTION OF EACH COUPON TO THAT OF THE CROSS-SECTIONAL AREA OF THE ADJACENT FULL WIDTH PORTIONS OF THE STRIP VARYING IN EACH COUPON WITH RELATION TO THAT OF THE OTHER COUPONS, AND THE RATIO OF THE LENGTH OF EACH COUPON TO THAT OF THE COUPON''S NECKED-DOWN PORTION VARYING IN EACH COUPON FROM END TO END OF SAID ELONGATE STRIP, AS TO EFFECT CONTROL OF THE STRESS-MAGNIFICATION IN THE RESPECTIVE COUPONS THEREBY TO CAUSE THE RESPECTIVE COUPONS TO SUCCESSIVELY FAIL AT DIFFERENT TIMES DURING THE USE-LIFE OF THE ELEMENT, WHEREBY TO AFFORD A SUCCESSION OF FATIGUE-FOREWARNING MONITORING READINGS IN THE ONE ELONGATE STRIP.
Claim 2
Dependent Claim
213 words
MEANS FOR MONITORING FATIGUE OF STRUCTURAL ELEMENTS WHICH ARE SUBJECTED TO DIVERS AND VARIOUS LOADS, INCLUDING REVERSED LOADS, COMPRISING: AN ELONGATE STRIP OF MATERIAL HAVING A UNIFORM THICKNESS AND INCLUDING A PLURALITY OF STRIP-MOUNTING AREAS AND A PLURALITY OF LONGITUDINALLY ALIGNED, COUPONS EACH WITH A NECKED DOWN PORTION, EACH ONE OF SAID COUPONS BEING DISPOSED BETWEEN AN ADJACENT PAIR OF SAID AREAS, MEANS FOR ATTACHING THE MOUNTING AREAS OF THE STRIP TO THE ELEMENT TO BE MONITORED; AND EACH COUPON HAVING AN APERTURE CENTRALLY THEREOF INTERMEDIATE ITS END-PORTIONS FOR MAGNIFYING THE STRESS DEVELOPED IN THE COUPON WHEN THE STRIP IS IN USE; THE RATIO OF THE CROSS-SECTIONAL AREA OF THE NECKED-DOWN PORTION OF EACH COUPON TO THAT OF THE CROSS-SECTIONAL AREA OF THE ADJACENT FULL WIDTH PORTIONS OF THE STRIP VARYING IN EACH COUPON WITH RELATION TO THAT OF THE OTHER COUPONS, AND THE RATIO OF THE LENGTH OF EACH COUPON TO THAT OF THE COUPON''S NECKED-DOWN PORTION VARYING IN EACH COUPON FROM END TO END OF SAID ELONGATE STRIP, AS TO EFFECT CONTROL OF THE STRESS-MAGNIFICATION IN THE RESPECTIVE COUPONS THEREBY TO CAUSE THE RESPECTIVE COUPONS TO SUCCESSIVELY FAIL AT DIFFERENT TIMES DURING THE USE-LIFE OF THE ELEMENT, WHEREBY TO AFFORD A SUCCESSION OF FATIGUE-FOREWARNING MONITORING READINGS IN THE ONE ELONGATE STRIP.
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |