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australian electronic gold prospecting forum.com  |  Patents  |  Detector Patents  |  Topic: METAL DETECTOR WITH IMPROVED MAGNETIC RESPONSE APPLICATION 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: METAL DETECTOR WITH IMPROVED MAGNETIC RESPONSE APPLICATION  (Read 160 times)
Doug
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« on: November 16, 2010, 12:35:03 PM »
METAL DETECTOR WITH IMPROVED MAGNETIC RESPONSE APPLICATION
United States Patent Application
This invention discloses a low cost metal detector which suppresses signals arising from signals induced in a receive inductor from a rate of change of environmental static fields. The metal detector processes a signal due to a rate of change of environmental static fields to produce a first signal, and processes a signal due to the transmitted magnetic field to produce a second signal, the second signal includes a proportion of the first signal. Signal processing includes the subtraction of an estimation of the proportion of the first signal from the second signal to produce a third signal, such that the third signal is substantially independent of the first signal; and the receive electronics further processes the third signal to produce an indicator output signal, the indicator output signal includes a signal indicative of the presence of a metallic target and is substantially unaffected by the signal due to a rate of change of environmental static fields
20100283467
http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PG01&s1=%22metal+detector%22&OS=%22metal+detector%22&RS=%22metal+detector%22
I maybe wrong but I thought that this was what SETA was supposed to do?
doug happy face
« Last Edit: November 16, 2010, 01:17:03 PM by Doug » Logged
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bugwhiskers
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« Reply #1 on: November 16, 2010, 12:50:01 PM »
Hi Doug,

You have to laugh at the following quote from the patent.

The only way to guarantee the same accurate suppression of the very low frequency signals performance for different synchronous demodulation or sampling reference signals is to have a different set of potentiometers for each set of different signals. This is even more expensive.

It's totally absurd when the detector parts cost is such a small fraction of the selling price. The pots mentioned, if purchased in quantity would probably cost around 50 cents !

One pot is one thirteen thousandth of $6500 !


regards
bugwhiskers

« Last Edit: November 16, 2010, 12:53:00 PM by bugwhiskers » Logged
Not using the detectors existing audio stream for the user adjustment interface is just plain "dumb"
gef12
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« Reply #2 on: November 16, 2010, 01:12:26 PM »
hmm nothing worse than fiddling with pots in the field .. if thats how i'm reading it
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Doug
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« Reply #3 on: November 16, 2010, 01:30:31 PM »
 What I can't  understand is the the filing date of this patent application is November 11, 2008 and the publication date is 2 years later.Does it really take 2 years from the date of filing to publication?
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Huego
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« Reply #4 on: November 16, 2010, 01:47:30 PM »
Click! Click! freddy you are so obvious!   
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« Reply #5 on: November 16, 2010, 01:49:09 PM »
Quote from: Doug on November 16, 2010, 01:30:31 PM
What I can't  understand is the the filing date of this patent application is November 11, 2008 and the publication date is 2 years later.Does it really take 2 years from the date of filing to publication?
doug happy face

Perhaps it was contested before publication?
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« Reply #6 on: November 16, 2010, 02:23:42 PM »
 Here is the WIPO patent application. Have a read of page 11-14. See the comment on claim 10 of this patent below
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« Last Edit: November 16, 2010, 02:28:53 PM by Doug » Logged
"Let me be a free man....free to think and talk and act for myself."
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"Don't ask 'Why'; ask instead, 'Why not."
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All posts on this forum express the personal views of the author and should not be interpreted as necessarily being in accord with those of the forum owner
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australian electronic gold prospecting forum.com  |  Patents  |  Detector Patents  |  Topic: METAL DETECTOR WITH IMPROVED MAGNETIC RESPONSE APPLICATION « previous next »
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