Re: [ARSCLIST] Ampex & Sticky Shed Syndrome

["Richard L. Hess" <ArcLists@xxxxxxxxxxxxxxx>]

Patent 5,236,790 issued Aug 17, 1993; filed Mar 31, 1989. I think it
expires in 2010, but I'm not clear on the 17-20 year extension at the moment.

Cheers,

Richard

At 08:55 AM 12/20/2004 -0500, you wrote:
> When did Ampex get their patent? Patents in the US are for 20 years, I
> believe, so even if they were inclined to enforce it, they can't have
> many years left.
>
> Matthew Barton
> American Folklife Center
> The Library of Congress
> 101 Independence Ave., SE
> Washington, DC 20540-4610
> phone: (202) 707-1733
> fax: (202) 707-2076
> email: mbarton@xxxxxxx
>
> >>> ArcLists@xxxxxxxxxxxxxxx 12/18/2004 1:34:08 AM >>>
> I wonder why the IEEE Transactions on Magnetics September 1982 paper
> "Kinetics of Humid Aging of Magnetic Recording Tape" by H. Neal
> Bertram
> (Ampex) and Edward F. Cuddihy (JPL) wasn't referenced in the Ampex
> Patent.
>
> It is available online at
> http://home.flash.net/~mrltapes/bertram_humid-aging.pdf
>
> It is also widely listed on the Web in bibliographies.
>
> Enjoy.
>
> Cheers,
>
> Richard