Kinergetics Research was a company that made high end power amps and CD players. They bragged about their patented "hysteresis distortion" cancellation circuits. But if you search the US patent office's website, you won't find any Kinergetics patents. Here's why.
The circuit idea was patented by Kinergetics' founding partners, before they formed the company. So "Kinergetics" is not listed as the Patent Assignee, and if you search for it, you find bupkis. Searching for the inventors' names is similarly difficult; Anthony DiChiro was the president of Kinergetics and his name appears in much sales literature, but he's not an inventor on the patent. Nor is Marco Insinilla, another Kinergetics person whose name appears on some products.
The inventors are Kenneth W. Cowans and M. Owen Bennett, and the Patent Assignee is: themselves. (i.e. not Kinergetics). They patented two ways to reduce "hysteresis distortion", here are links to Google Patents pdf files of them
These patents have been previously cited on diyAudio, in (THIS POST by member tvi). I'm creating this thread, with Kinergetics Patent right in the title, to make it easier to find them via the website's Search tool, and also using Google with the "site:diyaudio.com" tag.
The Big Idea, in my opinion, is Figure 2 of the '146 patent. Shown below.
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The circuit idea was patented by Kinergetics' founding partners, before they formed the company. So "Kinergetics" is not listed as the Patent Assignee, and if you search for it, you find bupkis. Searching for the inventors' names is similarly difficult; Anthony DiChiro was the president of Kinergetics and his name appears in much sales literature, but he's not an inventor on the patent. Nor is Marco Insinilla, another Kinergetics person whose name appears on some products.
The inventors are Kenneth W. Cowans and M. Owen Bennett, and the Patent Assignee is: themselves. (i.e. not Kinergetics). They patented two ways to reduce "hysteresis distortion", here are links to Google Patents pdf files of them
These patents have been previously cited on diyAudio, in (THIS POST by member tvi). I'm creating this thread, with Kinergetics Patent right in the title, to make it easier to find them via the website's Search tool, and also using Google with the "site:diyaudio.com" tag.
The Big Idea, in my opinion, is Figure 2 of the '146 patent. Shown below.
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I seem to remember John Curl did this 40yr. ago by putting a tapehead in the feedback loop to mimic/cancel the behavior of the recording head.
These guys filed their patent application 31 years ago so JC beat them by 9 years. He used to work for Ampex (audio and video tape recording machine company), yes? It would explain his interest in removing tape head distortion.
Ron Quan's book on DIY radios says he worked with JC at Ampex.
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