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From: Patent Tactics, George Brock-Nannestad

Hello,

Eric Jacobs wrote:


> Found this RCA Orthacoustic patent filed in 1940 and granted 
> in 1942:
> 
> http://www7a.biglobe.ne.jp/~yosh/orthacoustic.pdf
> 
> Correct me if I'm wrong, but doesn't this look like the
> Columbia Curve (1590, 318, 100 usec TC; 100, 500, 1590 Hz TO)?
> See page 3, item 6 in the above patent document describing the
> EQ characteristic.

----- this is the very same patent that Kevin Mostyn mentioned in his first 
post.

Kind regards,


George