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Old 21st October 2004, 02:17 PM   #1
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Default Amplifier patents index

http://www.uspto.gov/go/classificati...tm#C330S083000

Click on the red & white "P" at the start of each line to get a list of links to examples.
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Old 22nd October 2004, 12:02 AM   #2
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Old 23rd October 2004, 09:44 AM   #3
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Good to know whos toes I'm stepping on
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Old 23rd October 2004, 01:33 PM   #4
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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:
http://www.tech-diy.com/patents_amplifiers.htm
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Old 24th October 2004, 01:29 PM   #5
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Class 381 ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES
http://www.uspto.gov/go/classificati...1/sched381.htm
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Old 31st October 2004, 10:45 AM   #6
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Quote:
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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