"Long Hair" wrote in message news:p637ej$179k$ snipped-for-privacy@gioia.aioe.org...
Not in the US.
Conveniently, this article is from 2006, just when the law changed, so you see the contemporary perspective.
Tim
-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: https://www.seventransistorlabs.com/
"as long as you are not profiting from it..." That just doesn't make any cents!
Cost you three 'kiln wattage dollars' to melt down a $2.50 wad of pennies.
Yeah... really well thought out... NOT!
Nasa tends to claim credit for a lot of things that were invented and developed somewhere else.
Wiki says the first patent on a heat pipe was in 1831. And the current design was developed in 1942.
When I was in Huntsville I knew a guy that got advances on a book about NASA from NASA. But he never wrote the book and NASA did not want the publicity from suing him. So they never got the book and were out of the money they advanced this guy.
Dan
Just need a train track.
AlwaysWrong is, of course, wrong.
Of course.
We should get rid of the penny. I bet we'd save at least millions/ year.
George H.
Make sales tax unconstitutional and I'll give up pennies. ;-)
Cheap? How much per ounce and compare that to #1 scrap copper rate..
...which is counterfeit, fake and NOT copper.
I have used copper squares sold for heat sinking. I mixed up some diamond dust thermal paste to interface to aluminum. There are More expensive diamond wafers, or carbon nano tubes.
Greg
You'd get more for your money by punching squares
NT
That is not what iot said when I read it. And those pipes are empty bare copper simple conduction paths, not vapor phase change science.
Funny that we did not see their use until 1996 in consumer PCs on GPUs and CPUs.
No, it's not funny, AlwaysWrong. Dan is absolutely correct. NASA had nothing to do with it.
Probably for the same reason that we did not see water cooling on CPU's. It just was not needed with lower power CPU's.
Dan
+1. My old 486 had a tiny CPU heatsink & no fan. Power guzzling came later, and was a trade-off to enable faster computers. The wheel has now turned full circle with low power phone & tablet CPUs.
NT
CPUs run cooler these days than when the first dual processor CPUs hit.
AMDs were notorious for getting fried and taking the motherboard out with them.
They are way better now with the smaller scale fabs.
The disks will be so cheap, that doesn't matter much. The overall mechanical design and machining are a bigger challenge.
I'm sure that people who punch these things reycle the leftovers.
We're actually having fun with this problem, the electronic and thermal and mechanical interactions. The product itself is a very difficult design, so there's lots to debate.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
I haven't been impressed with diamond-loaded paste or epoxy. If the mating surfaces are flat, the thing to do is get them as close together as possible, which means that a filled epoxy or grease should have really small particles. Maybe no fillers at all, if the surfaces are really flat. The usual Dow 340 will squeeze down to micro-inches.
Any filled grease is limited by the geometry of the filler particle contact, so the grease itself eventually dominates.
-- John Larkin Highland Technology, Inc lunatic fringe electronics
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