US Patent No: 6,266,994
Number of patents in Portfolio can not be more than 2000
Method and apparatus for measuring properties of materials or structures
Stats
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Jul 31, 2001
Issued date -
Sep 16, 1999
filing date -
09/355,255
serial no -
Expired
status
Importance
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Abstract
Stress wave measuring apparatus includes a Hopkinson bar or pressure bar bundle system comprising an input bar bundle having input bars, and an output bar bundle having output bars 104a. A brittle test specimen is positioned in between the input and output bar bundles. Means is provided to induce a one dimensional compression force into the bar bundles. Instrumentation is introduced onto the input and output bars for measuring values of shear wave or crack propagation. The specimen may be placed under different stress conditions measured by appropriate instrumentation on the bar bundles. In one embodiment, a rod gauge is glued to a rock massive and arranged to measure wave effects generated in the rock massive. Other arrangements provide amplification of the wave effects prior to measurement by instrumentation on the gauge 500.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,379,401 System for measuring plate deformation produced by explosive shock waves, and motion-sensing accelerometer transducer used therein | 11 | 1981 | |
| 5,487,298 Inertial Hopkinson bar shock sensor | 8 | 1994 | |
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| 6,023,976 Prodder with force feedback | 2 | 1998 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jan 31, 2013 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |