FR 6.4

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Patent category FR 6.4 or VI.4 was for Aviation and aerostation.[1]

This was a long lasting category of French patents, for technologies associated with aviation and aerostation.

Most of the French patents relevant to this wiki were in this category, once it existed. (Dates to fill in) Before that, some were put in FR 6.3. Earlier still French aero patents were designated as FR 4, categorized among machines more generally.

References

This wiki has 1,977 patents in category "FR 6.4". Other techtypes related to FR 6.4: Marine, USPC 244

Patents in category FR 6.4

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Enclosing categories FR 6, French patent classifications, Classifications of French patents, 1904-1958
Subcategories
Keywords USPC 244, CPC B64, Airplane, LTA
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