Patent US3226975A successfully refreshed from Google Patents.
US3226975A
Expired / Lapsed
US
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Methods for testing materials for faults
Assignee: Huttenwerk Salzgitter AG
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Filing: 1961-08-18
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Granted: 1966-01-04
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Expires: 1981-08-18
Abstract
No abstract record available.
Inventors
- 👤 Erich H K Muller
- 👤 Peetz Eugen
- 👤 Huber Reinhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:51
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G07; G07C; G07C3/00; G07C3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
THE METHOD OF NON-DESTRUCTIVE TESTING OF ELASTIC WORKPIECES IN THE FORM OF RECTANGULAR PLATES FOR THE PRESENCE OF FAULTS, WHICH COMPRISES THE STEPS OF CLAMPING THE WORKPIECE SYMMETRICALLY WITH RESPECT TO ONE OF ITS MAIN AXES OF SYMMETRY, APPLYING LOOSE PARTICULATE MATERIAL ON THE WORKPIECE TO SHOW RESONANCE PATTERNS, APPLYING TRANSVERSE RESONANCE OSCILLATIONS TO THE CLAMPED WORKPIECE SEQUENTIALLY ON BOTH SIDES OF SAID ONE AXIS SO AS TO PRODUCE CORRESPONDING NODAL LINE PATTERN OF SUCH TYPE THAT SUBSTANTIALLY ALL OF THE NODAL LINES THEREOF RUN APPROXIMATELY AT RIGHT ANGLES TO THE DIRECTION OF SAID ONE AXIS AND ARE INTERSECTED BY AT MOST ONE NODAL LINE AT THE LOCUS OF SAID ONE AXIS, THE RESPECTIVE RESONANCE FREQUENCIES OCCURRING FIRST IN ONE OF THE PLATE HALVES AND THEN IN THE OTHER PLATE HALF AND CORRESPONDING TO THE RESPECTIVE NODAL LINE PATTERNS, THE DIFFERENCE OCCURRING BETWEEN THE TWO RESONANCE FREQUENCIES SERVING AS CRITERION FOR THE PRESENCE AND SIZE OF DEFECTIVE PLACES IN SAID WORKPIECE.
Claim 2
Independent Claim
161 words
THE METHOD OF NON-DESTRUCTIVE TESTING OF ELASTIC WORKPIECES IN THE FORM OF RECTANGULAR PLATES FOR THE PRESENCE OF FAULTS, WHICH COMPRISES THE STEPS OF CLAMPING THE WORKPIECE SYMMETRICALLY WITH RESPECT TO ONE OF ITS MAIN AXES OF SYMMETRY, APPLYING LOOSE PARTICULATE MATERIAL ON THE WORKPIECE TO SHOW RESONANCE PATTERNS, APPLYING TRANSVERSE RESONANCE OSCILLATIONS TO THE CLAMPED WORKPIECE SEQUENTIALLY ON BOTH SIDES OF SAID ONE AXIS SO AS TO PRODUCE CORRESPONDING NODAL LINE PATTERN OF SUCH TYPE THAT SUBSTANTIALLY ALL OF THE NODAL LINES THEREOF RUN APPROXIMATELY AT RIGHT ANGLES TO THE DIRECTION OF SAID ONE AXIS AND ARE INTERSECTED BY AT MOST ONE NODAL LINE AT THE LOCUS OF SAID ONE AXIS, THE RESPECTIVE RESONANCE FREQUENCIES OCCURRING FIRST IN ONE OF THE PLATE HALVES AND THEN IN THE OTHER PLATE HALF AND CORRESPONDING TO THE RESPECTIVE NODAL LINE PATTERNS, THE DIFFERENCE OCCURRING BETWEEN THE TWO RESONANCE FREQUENCIES SERVING AS CRITERION FOR THE PRESENCE AND SIZE OF DEFECTIVE PLACES IN SAID WORKPIECE.
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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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |