Etienne Langlois

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Paris, FR

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Patents Grantslast 30 patents

Information Patent Grant
Electromechanical filters
- Patent number 4,255,727
- Issue date Mar 10, 1981
- Societe Lignes Telegraphiques et Telephoniques
- Herbert Ernyei
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Electromechanical filter structure
- Patent number 4,163,960
- Issue date Aug 7, 1979
- Societe Lignes Telegraphiques et Telephoniques
- Herbert Ernyei
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Method of measuring the resonance frequency of mechanical resonators
- Patent number 4,114,454
- Issue date Sep 19, 1978
- Societe Telegraphiques et Telephoniques
- Herbert Ernyei
- G01 - MEASURING TESTING