File:US2248870.pdf

US2248870.pdf(file size: 443 KB, MIME type: application/pdf)

Summary

American version of the French patent deposited in 1918 by Paul Langevin. The deposition date is June 21rst 1920 but it was only granted in 1941.

In this patent, Paul Langevin specifically describes the use the piezoelectric properties of quartz to generate and receive ultrasound waves in water.

File history

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current15:37, 23 January 2020 (443 KB)Bleridon (talk | contribs)American version of the French patent deposited in 1918 by Paul Langevin. The deposition date is June 21rst 1920 but it was only granted in 1941. In this patent, Paul Langevin specifically describes the use the piezoelectric properties of quartz to ge...
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