[sdiy] Ensoniq patent, was: distance meter for keyboard, was: Where to get special white keys?

[cheater cheater]

OK, I've done a search in online patents databases and couldn't find
the patent for ensoniq's hall sensor stuff..
I think I know why..
Patents only last 20 years total (and that's including the single
possible renewal you can do)
This means we're all free to use hall sensor technology in commercial
keyboards - yay!
So *this* is the secret of how the VAX guys circumvented the Ensoniq
patent... they *didn't*!

Good times, guys.
Expect many expressive keyboards.

Keyboard synthesizers can be musical instruments again.

D.

On Sun, Mar 1, 2009 at 3:04 PM, cheater cheater <cheater00 at gmail.com> wrote:
> Ingo, I was trying to find the Ensoniq patent for poly aftertouch but
> failed. Are you able to find it?
>
> Cheers
> D.
>
> On Sun, Mar 1, 2009 at 1:35 PM, cheater cheater <cheater00 at gmail.com> wrote:
>> And patented.
>> I know you can use patented things for DIY, though.
>>
>> What about optical sensors?
>>
>> D.
>>
>> On Sun, Mar 1, 2009 at 9:59 AM, Ingo Debus <igg.debus at t-online.de> wrote:
>>>
>>> Am 28.02.2009 um 21:24 schrieb cheater cheater:
>>>
>>>> Then the next very difficult thing to do would be
>>>> to figure out the distance meter for the key: I would probably go for
>>>> something optical, and this assembly could be quite difficult, and
>>>> parts hard to source.
>>>
>>> Or you could use an analog (linear) hall sensor and a small magnet. This
>>> should not be too expensive, and easy to build.
>>>
>>> Ingo
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>>>
>>
>