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    Re: Accuracy of Bygrave
    From: Ken Gebhart
    Date: 2009 Jul 6, 21:50 -0500

    I am way out of my league here, but have dabbled in some patent
    efforts back in the 60s.  Then, an inventor was required to "reduce
    the invention to practice".  He did this by finding an expert in the
    field with credentials, to state in writing that the invention indeed
    works.  This relieved the Patent Office from having to ascertain
    themselves that the invention worked.  Once done, and the results
    from the expert were signed and dated, the inventor had a period of
    time in which to actually file for patent protection.  It seems to me
    this period was two years.  Meanwhile the inventor was free to
    divulge the workings of his invention without fear of losing his rights.
    Ken Gebhart
    On Jul 6, 2009, at 2:28 PM, glapook@pacbell.net wrote:
    > It's interesting that Wimperis describes the Bygrave slide rule in
    > this book which was published in February, 1920 while Bygrave's patent
    > application is dated March 29, 1920, a month later.
    > gl
    > On Jul 6, 12:05 am, "Gary J. LaPook"  wrote:
    >> Attached is one more reference work that mentions the accuracy of the
    >> Bygrave.
    >> The flat Bygrave is just as accurate as the cylindrical one.
    >> gl
    >> glap...@PACBELL.NET wrote:
    >>> Attached are two more reference works mentioning the accuracy of
    >>> the Bygrave.
    >>> Look at page 795 of NACA report 131
    >>> gl
    >>> Linked File:http://www.fer3.com/arc/imgx/naca-report-131.pdf
    >>  Wimperis-Bygrave.pdf
    >> 306KViewDownload
    > >
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