[CW] Lightening Bug Patents

[Richard Knoppow]

    My 1961 Original is the same. Most of the patents listed on the 
earlier keys would have expired by 1950. My 1961 Original is the same, 
no patent numbers shown. The patent law has changed many times and might 
account for the lack of listing.
    FWIW, until fairly recently United States patents were active for 17 
years. It has been changed now to 20 years to make it consistent with 
international law. At one time patent dates were listed. At some point, 
I read somewhere 1927, the law was changed to require the actual patent 
number be shown. Patents are issued in batches so when only a date is 
shown it may be difficult to find which patent is meant. I think patent 
numbers _could_ be shown before that date but were not required.
    I was hoping that a patent showing the Lightening Bug design could 
be found. It seems that either no patent was applied for or that there 
was nothing patentable.
    Thank  you for following up on this.

On 3/29/2024 8:05 AM, Roland "Ron"Günther wrote:
> Hello to all,
> 
> Here is information about the patent number, my Lightning with serial 
> number 169708 is from 1950, there is no patent number to be seen.Please 
> note two pictures in the attachment
> 
> 
> 73 Ron,es cwfe DL5CL BUG#40
> ....................
> www.dl5cl.de
> 


-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998