Regarding "flesh detecting" saw safety devices patents, I don't think there was much of a challenge to the validity of the Gass/sawstop patents. Such challenges usually deal with prior art - someone else described or patented this before he did or that it was not an improvemnt on existing tech, I did see in google search some litigation between black and decker/Bosch wit SD3 over the Gass patent.
I see in various searches that The Gass patent is assigned to SD3 LLC which is the parent company of SawStop.LLC.
I see that TTC, parent company of Festool bough Sawstop LLC. So its hard to tell if it inludes ownership of the patents (I'm guessing not since SD3 owns them and SD3 sold the Sawstop, but I'm sure that the purchase includes at least a permanent license to use the patent.
Everyone should remember that Gass's litigation was to force the FTC to adopt regulations for saw to include a safety device that was worded so specifically as to require the use of a device with the Gass patent. Competitors were fighting to get more latitude in the technology or no regulation at all.
I see in various searches that The Gass patent is assigned to SD3 LLC which is the parent company of SawStop.LLC.
I see that TTC, parent company of Festool bough Sawstop LLC. So its hard to tell if it inludes ownership of the patents (I'm guessing not since SD3 owns them and SD3 sold the Sawstop, but I'm sure that the purchase includes at least a permanent license to use the patent.
Everyone should remember that Gass's litigation was to force the FTC to adopt regulations for saw to include a safety device that was worded so specifically as to require the use of a device with the Gass patent. Competitors were fighting to get more latitude in the technology or no regulation at all.
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