12" Tapped horn

I built my clones right at $300 and perform within a Db of specs.
The B&C driver is over half that cost plus I have handles and pole mounts.

Look at the price of F1 gear or even Void.
How much are 4 Psycho's? And that doesn't give the same output as a single TH221 which takes up less space.

As far as the TH Mini.
Frak Nothing comes close at that size.

As far as Martin or Turbo.
Those guys are to big. IE have allot to loose. Plus it is Danley. Who wants to disrespect him?


And I have read the patent app and other
materials for the TH's. It seems it is for principal and design. Other people have things similar but didnt work the same.  IE Danley made it work correctly. And since the math is what makes it work. Cant just change it a little bit to get around the patents. Least I assume not.

flipc do you have any diagrams...

"I just think it's strange that no one else is playing with the th design?"

What part of the word 'Patent' don't you understand?

If you build a couple of TH for yourself, Danley might shake your hand. If you sell a bunch of TH I'm sure his lawyer will be by to shake your tree.

"if it was altered/remade surly the copyright goes out the window?"

Try it and see what happens. You will end up in court and spend a lot of cash to learn your lesson. If yours is enough different you might not lose (other than the huge amount of time and money you invest).

The difference between a utility and a design patent is simple, if it uses the design principle of the utility patent, it violates the patent even though it may look different. On a design patent you may have to change the looks so much it may not work.

You are best to hope that the patent is not granted. His B-DEAP32 has not been granted (filed for 6 years ago), although US0D0524797 was granted (on the looks of the B-DEAP32) about 4 years ago.

TH-115 costs around 2100 US$ new. You can already find some used ones in USA, so that is actually a lot cheaper than some offerings from Turbo, Martin, F1, Void and so on ....

Hi!

Patent for application US 2009/0323997 A1 of Dec.31,2009  is already granted?

Prior art (*)wasn’t mentioned; so I may imagine that the above applier didn’t know about it and that it is relevant as mentioned in Voice Coil of March, 2010, from page 18 on shows article Acoustic Patents, by James Croft, and the figure 2 of a patent bellow mentioned (problably the FIRST tapped horn).
This is the patent 2,765,864 (*)filled March 14,1955, granted Oct.09,1956, for W.E.Glenn, which describes the "tapped horn", with drawings, curves, ...

See it yourself opening that patent with bellow link:

Patent Fetcher - Patent Fetcher PDF Processing

In Voice Coil march 2010 page 20 James Croft writes:
"While all the items listed above are significant, US 2,765,864 appears to disclose the substantially SAME DEVICE that is expressed in the Danley application." ...

So is the patent effectively granted up to date? And will/should it be granted after comparing? After 20 years should it be public domain?

Edited by Paulo Duto - 27 June 2010 at 6:44pm

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