Patent US2920007A successfully refreshed from Google Patents.
US2920007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastic fluid blade with a finegrained surface
Assignee: General Electric Co
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Filing: 1958-01-16
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Granted: 1960-01-05
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Expires: 1978-01-16
Abstract
No abstract record available.
Inventors
- 👤 Bruce O Buckland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:12
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/288; F01D5/286
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
AN ELASTIC FLUID BLADE COMPRISING A CORE OF BASE METAL FORMED OF MATERIAL HAVING HIGH MECHANICAL STRENGTH AND HAVING A LARGE GRAIN SIZE IN THE GENERAL RANGE 0.100 TO 0.200 MM., AND A PROTECTIVE SURFACE LAYER INTIMATELY ADHERED TO SAID CORE AND EXTENDING THEREAROUND, SAID PROTECTIVE SURFACE LAYER BEING FORMED OF THE SAME MATERIAL AS SAID CORE AND HAVING A SMALL GRAIN SIZE IN THE GENERAL RANGE 0.010 TO 0.030 MM., THE THICKNESS OF SAID PROTECTIVE SURFACE LAYER BEING SUCH THAT ITS CROSS SECTION IS 10 TO 25% OF THE TOTAL CROSS SECTION OF THE PORTION OF THE BLADE ON WHICH IT IS USED, SAID PROTECTIVE SURFACE LAYER HAVING A HIGH RELAXATION RATE COMPARED TO SAID CORE OF BASE METAL AND BEING SUBJECT TO CREEP TO REDUCE STRESS CONCENTRATIONS IN THE PROTECTIVE SURFACE LAYER, WHEREBY SUBSTANTIALLY TO PREVENT PROPAGATION OF CRACKS FROM NICKS AND FLAWS IN SAID PROTECTIVE SURFACE LAYER AND THUS SUBSTANTIALLY TO PREVENT FORMATION OF RUPTURE CRACKS AND FATIGUE CRACKS IN SAID CORE DUE TO NICKS AND FLAWS IN SAID PROTECTIVE SURFACE LAYER.
Claim 2
Dependent Claim
175 words
AN ELASTIC FLUID BLADE COMPRISING A CORE OF BASE METAL FORMED OF MATERIAL HAVING HIGH MECHANICAL STRENGTH AND HAVING A LARGE GRAIN SIZE IN THE GENERAL RANGE 0.100 TO 0.200 MM., AND A PROTECTIVE SURFACE LAYER INTIMATELY ADHERED TO SAID CORE AND EXTENDING THEREAROUND, SAID PROTECTIVE SURFACE LAYER BEING FORMED OF THE SAME MATERIAL AS SAID CORE AND HAVING A SMALL GRAIN SIZE IN THE GENERAL RANGE 0.010 TO 0.030 MM., THE THICKNESS OF SAID PROTECTIVE SURFACE LAYER BEING SUCH THAT ITS CROSS SECTION IS 10 TO 25% OF THE TOTAL CROSS SECTION OF THE PORTION OF THE BLADE ON WHICH IT IS USED, SAID PROTECTIVE SURFACE LAYER HAVING A HIGH RELAXATION RATE COMPARED TO SAID CORE OF BASE METAL AND BEING SUBJECT TO CREEP TO REDUCE STRESS CONCENTRATIONS IN THE PROTECTIVE SURFACE LAYER, WHEREBY SUBSTANTIALLY TO PREVENT PROPAGATION OF CRACKS FROM NICKS AND FLAWS IN SAID PROTECTIVE SURFACE LAYER AND THUS SUBSTANTIALLY TO PREVENT FORMATION OF RUPTURE CRACKS AND FATIGUE CRACKS IN SAID CORE DUE TO NICKS AND FLAWS IN SAID PROTECTIVE SURFACE LAYER.
References Cited (Backward Citations)
US2519406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |