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Circlotron 21st October 2004 02:17 PM

Amplifier patents index

Click on the red & white "P" at the start of each line to get a list of links to examples.

mikeks 22nd October 2004 12:02 AM

Thanks! :)

Geek 23rd October 2004 09:44 AM

Good to know whos toes I'm stepping on ;)

jackinnj 23rd October 2004 01:33 PM

I started this page when I broke my ankle a couple years ago (nothing to do but wait for the heel to heal) -- it has some of the abstracts:

Circlotron 24th October 2004 01:29 PM


audiousername 31st October 2004 10:45 AM


Originally posted by Geek
Good to know whos toes I'm stepping on ;)

I don't know about Geek people stepping on patent-holder's toes... but I am rather surprised that some of these patents have toes at all.

The 2nd patent from the first link Circlotron posted, "Vacuum Tube Differential Preamplifier" seemed to quite accurately describe the Western Electric transformer-coupled line driver circuit (well... to me anyway) from... who knows when: two valves mounted in differential with an output transformer. Yet it is an "invention" from... 1998

I am not accusing the patent of being invalid, just rather confused. And I do not want to be sued... Lots of other confusing patents exist as well. I suppose it isn't the aim of a patent to explain the invention clearly, but rather to explain it as vaguely as possible to help protect it.

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