The patent number should be 6,043,695, issued March 2000, filed in 1998.  If
I recall correctly, it was the reverse insertion of an N-channel Mosfet in
the low side of the load.  I found this patent interesting about a year ago
or so and we examined it thoroughly.  I also discovered 2 issuances of prior
art, much greater than the one year prior to filing.

Craig R. Autio


----- Original Message -----
From: apptech <apptech@PARADISE.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, October 07, 2002 8:12 AM
Subject: Re: Protecting Against Hooking Up a Battery in Reverse


For reverse voltage protection you can use a MOSFET circuit
> > which appears as one variation in a US patent- but I know at least one
> > person who claims
> > prior art exists. You should check those aspects out for yourself and
act
> > accordingly.
> >
> > Here is the circuit: http://www.speff.com/60439565.gif
>
> That number appears to be wrong - at least I could not find a US patent of
> that number.
> What year is it. >

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