Dampp-Chaser Patent #6,133,519

[Avery]

John & others,

I just sent this to Roger Wheelock at Dampp-Chaser. Maybe he'll have something
to say.

Avery

At 08:54 PM 4/30/2007, you wrote:
>Paul,
>
>I looked at this last night. (www.uspto.gov) It appears to be the only
>patent for a cover to be used in conjunction with a DC system. I
>didn't look everywhere, but this was one of the three patents I found
>for Dampp-Chaser Corp.
>
>Anyway, what this appears to be talking about is the older way of
>doing it with the mylar type plastic material. I think I installed
>only one of those, as it was right around the time that I started
>working full-time as a piano tech.
>
>The undercover in use now is speaker fabric.
>
>There is a possibility that there might be a patent pending. Maybe
>someone could contact Dampp-Chaser and find out. Or maybe someone from
>there will comment here on the list.
>
>There are a number of us who want to abide by the law, and it would be
>helpful to know exactly what that is.
>
>JF
>
>P.S. After reading the patent lingo, one thing I hope I never have to
>become is a patent lawyer. Ugh!  :-)  No offense to any of you who
>like that kind of thing.
>
>On 4/30/07, paul bruesch <tunergeek at gmail.com> wrote:
>>I found the Dampp-Chaser's patent online:
>>http://www.freepatentsonline.com/6133519.pdf
>>(you might have to create an account to look at the pdf, for some darned
>>reason)
>>
>>According to the abstract, the under/back cover patent is for a "...moisture
>>impervious aperture free sheet...".  In the detail of the patent write-up,
>>under "Background of the Invention" it specifies "MYLAR or felt" (caps
>>theirs) "... having a plurality of apertures or holes..." (which, to my
>>mind, contradicts the abstract portion... but then again I'm not a lawyer.)
>>
>>So, what sort of fabric/material is Dampp-Chaser's under/back cover made
>>of?  I'm not a rocket scientist, nor even a acoustic engineer, heck, I'm not
>>even an RPT, but the idea of Mylar back/under cover on a piano sounds to me
>>like it would sound a bit bizarre. Wouldn't it?? And wouldn't felt mute and
>>muffle the sound?  (see previous disclaimers regarding my qualifications)
>>
>>I wonder what a "plurality of apertures or holes" means... several holes
>>and/or apertures in the cover, or is that phrase intended to include an open
>>weave like speaker cloth, being what it sounds like many techs are using.
>>An open weave certainly has a "plurality of holes," but it would make a lot
>>more better sense to say "open weave fabric."
>>
>>Please understand that I'm not trying to get around anyone's patent, or
>>infringe on same... when the time comes I'll order the DC cover simply for
>>the convenience of it, if for no other reason. My curiosity is piqued about
>>this patent for a new way to use a piece of cloth... and I'd just like to
>>understand it better. Judging from the amount of traffic generated by this
>>topic, I don't think I'm alone.
>>
>>Paul Bruesch
>>Computer Geek and PTG Associate, who typically plays by the rules but wants
>>to understand them. And I don't run with scissors.
>>
>>
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