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Mach-3 Compatibles that are Mach-3 cartridges?

OK, now to my next question. How can these non-Gillette branded but compatible cartridge vendors get away with the connector patents? Are they not manufaturing/selling these illegally or do they pay Gillette royalties?Someone with the answer?
 
OK, now to my next question. How can these non-Gillette branded but compatible cartridge vendors get away with the connector patents? Are they not manufaturing/selling these illegally or do they pay Gillette royalties?Someone with the answer?

Patents are not infinite in duration.
That's why we are using R134a instead of R12, and it will be replaced by R1234yf, and why the Trac-II was replaced by the Sensor, and Mach-3, and Fusion.
 
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