My product and knock offs question

LipstickmogulLipstickmogul Posts: 6subscriber
edited July 2007 in Protecting Your Ideas
Say someone has put a similar product to my patented one on the market - with just one change or something similar but maybe different material, etc.  I see so many products come out and soon after, even when they are patented, one comes out that is just a little different and less expensive...how does this happen if there is a patent?
Thanks!
Robin 

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