[SI-LIST] Re: Sanmina patent on dielectric thicknesses under 4 mi ls
- From: Ritchey Lee <leeritchey@xxxxxxxxxxxxx>
- To: RKhederian@xxxxxxxxxxxx
- Date: Mon, 03 Dec 2001 17:42:20 -0800
There are a total of
5,010,641 Sisler etal 4/30/91
5,079,069 Howard etal 1/7/92
5,261,153 Lucas etal 11/16/93
5,155,655 Howard etal 10/13/92
5,161,086 Howard etal 11/3/92
Between them, they patent all of the ways to make multilayer PCBs, capacitance
that results from placing planes in parallel and the 2 mil spacing that
Zycon/Hadco sells.
It is not legal to pattent prior art. All of the things covered in these
patents existed as prior art for a long time before these patents were
granted.
The patent search process failed us on these.
Lee
Khederian, Bob wrote:
> Does anyone have this patent number?
>
> -----Original Message-----
> From: Moran, Brian P [mailto:brian.p.moran@xxxxxxxxx]
> Sent: Tuesday, November 27, 2001 2:47 PM
> To: 'JK100005@xxxxxxxxxxxxxxxxxxxxxxxxxxx'; rmiller@xxxxxxxxxxx;
> si-list@xxxxxxxxxxxxx; rfmeas@xxxxxxxxxxxxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Sanmina patent on dielectric thicknesses under 4
> mi ls
>
> Ron,
>
> I was under the impression the patent only applies to core material less
> than 4mils, and you could skirt the issue by using prepreg for these
> dielectrics. Of course, 2-3mil prepreg has its own set of problems. Has
> Sanmina actually patented the idea of thin dielectric spacing in general.
> That would be a travesty. Wish I had thought of it.
>
> Brian P. Moran
> Signal Integrity Engineer
> Intel Corporation
> brian.p.moran@xxxxxxxxx
>
> -----Original Message-----
> From: Knighten, Jim L [mailto:JK100005@xxxxxxxxxxxxxxxxxxxxxxxxxxx]
> Sent: Tuesday, November 27, 2001 11:19 AM
> To: rmiller@xxxxxxxxxxx; si-list@xxxxxxxxxxxxx;
> rfmeas@xxxxxxxxxxxxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Sanmina patent on dielectric thicknesses under 4
> mi ls
>
> Ron,
>
> Here are 2 approaches that avoid disputing the patent.
>
> 1. Get a copy of the patent (it was issued to a previous company, I think)
> and read the claims carefully. This will tell you exactly what the patent
> protects and where the boundaries are.
> 2. or, license the use of the patent from the patent holder. This is
> commonly done.
>
> If you violate the patent with the goal of disputing the validity of the
> claims in court, expect to be quite a lot older before it is resolved.
>
> Jim
>
> Jim Knighten, Ph.D.
> Teradata, a Division of NCR http://www.ncr.com
> 17095 Via Del Campo
> San Diego, CA 92127
> USA
> Tel: 858-485-2537
> Fax: 858-485-3788
> jim.knighten@xxxxxxx
>
> -----Original Message-----
> From: Ron Miller [mailto:rmiller@xxxxxxxxxxx]
> Sent: Tuesday, November 27, 2001 10:36 AM
> To: si-list@xxxxxxxxxxxxx; rfmeas@xxxxxxxxxxxxxxxxxxxxxxx
> Subject: [SI-LIST] Sanmina patent on dielectric thicknesses under 4
> mils
>
> Hi Guys
>
> I am up against the problem of using thinner dielectric in order to
> eliminate the need for sub-1000 pf bypass capacitors.
>
> While this technique was used for many years some idiot at the patent
> office actually gave them a patent for it. No novelty at all but
> standard practice.
>
> Is anyone else having trouble with this?
>
> Does anyone have published articles or books that document this use prior
> to 1989?
>
> If so, please let me know. Perhaps a consortium of industry professionals
> can help to remove this travesty of the patent system.
>
> Ron Miller
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