ARP vs. Moog (nice title, innit?)

[Joachim Verghese]

Hi,

> I take exception to the idea that Moog might have borrowed anything
> from ARP.

But then again, you might infringe on someone's patent even if
you don't explicitly borrow.

I think the deal was that Moog started compensating their
exponential converters around the time the Minimoog was
born, using the dual transistor scheme we're all familiar with
now.

As it happened, Alan Pearlman already had a patent on a
circuit like that (US pat #3,444,362), so ARP could use this
as an argument when faced with Moog's filter lawsuit in the
early '70s. The outcome, as I understand it, was a mutual
agreement to drop charges.

I guess ARP could have continued using Moog's ladder circuit,
but instead they designed a new filter from scratch, a circuit
that became the basis for the 4072/4075 modules. (ARPtech
website update just around the corner, I promise! :-)

cheers,

-joachim