[GreenKeys] Motor start control

[Richard Knoppow]

----- Original Message ----- 
From: "Dave Horsfall" <dave at horsfall.org>
To: "Greenkeys" <greenkeys at mailman.qth.net>
Sent: Saturday, October 04, 2014 2:10 PM
Subject: Re: [GreenKeys] Motor start control


> On Fri, 3 Oct 2014, John Nagle wrote:
>
>> The circuit uses a 555 timer chip, which was apparently 
>> considered a
>> novel idea at the time.  I looked at the schematic on the 
>> first page of
>> the patent, and thought "This guy re-invented the 555". 
>> No, he just
>> used one, as it says in the patent text.
>
> I remain astonished that such obvious concepts can be 
> patented.
>
> -- Dave vk2kfu

     Please see USP 3,930,051



--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com