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

[David Ingebretsen]

To the best of my knowledge, all patents are public knowledge. If you can't
find it, that suggests it was not a patent, but protected intellectual
property. That, or it was not original/unique enough to be granted a patent.


Remember, in 1899 the head of the US patent office declared that everything
that could be invented, had been invented...


David


David M. Ingebretsen M.S., M.E.
Collision Forensics & Engineering, Inc.
2469 East Fort Union Blvd. STE 114
Salt Lake City, UT 84121
www.CFandE.com

801 733-5458 Office
801 842-5451 Cell

dingebre at CFandE.com
dingebre at 3dphysics.net






-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Rainer Buchty
Sent: Sunday, March 01, 2009 1:18 PM
To: cheater cheater
Cc: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Ensoniq patent, was: distance meter for keyboard, was:
Where to get special white keys?

On Sun, 1 Mar 2009, cheater cheater wrote:

> 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)

Just because they are expired doesn't mean they are not listed. There 
are plenty of patents available in the database which are expired.

I remember the one about the gas-sensing device for mine workers from 
the 19th century. It basically consists of a canary bird and a cage.

Definitely expired but in the database.

Rainer

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