Many Cards Versus One Card and a List Field

[Joe Lewis Wilkins]

I believe patents are limited to 14 years, but something like this is  
probably more of a copyright issue; copyrights are good for 28 years  
and renewable for two additional 28 year periods for a total of 84  
years. Of course, I've been wrong before. (sheepish grin)

Joe Wilkins

On Jan 15, 2008, at 5:35 PM, J. Downs wrote:

>> What made it possible to use HC that way was its "hint bits", a  
>> system for indexing field contents which is not only proprietary  
>> but patented as well.  Hint bits made it ultra-fast for obtaining  
>> data across the otherwise-complex structures that make up cards  
>> and fields.
>
> Certainly any such patent has expired by now.  Patents are  
> enforceable a maximum of 20 years past the filing date.
>
> J.
>
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