You realize that the patent number Discraft refers to isn't their patent number, but the one held by Innova for the bevel-edge disc. And when that patent ran out after 20 years (~2003), the disc companies that manufactured bevel-edge discs (even if they are their own creations) no longer had to pay royalty and acknowledge the original patent.
Just look at any older disc with a patent number on it. Innova's discs simply said "Patent No. 4568297" while Discraft's discs said "Licensed under US Patent 4568297".
The Wasp mold has the patent number because it came out first and they haven't changed the mold. The Buzzz mold (the real one, not the original first run "wasp-tooled" one) was made after the patent expired and wasn't legally required to have the patent # info on it.
Edit to add: The expiration of that patent is a big reason why there are so many more disc manufacturers now than there were 10 years ago. Back in the day, Discraft, Lightning, and Gateway all had to pay patent royalties to Innova just to produce golf discs. The patent expired, and suddenly we have Whamo creating discs again (an ill-fated line). Aerobie created the Epic. Ching broke away from Innova to create their own line of discs. Discwing and Lat64 emerged in Europe. And so on. All in large part because the patent expired.
Just look at any older disc with a patent number on it. Innova's discs simply said "Patent No. 4568297" while Discraft's discs said "Licensed under US Patent 4568297".
The Wasp mold has the patent number because it came out first and they haven't changed the mold. The Buzzz mold (the real one, not the original first run "wasp-tooled" one) was made after the patent expired and wasn't legally required to have the patent # info on it.
Edit to add: The expiration of that patent is a big reason why there are so many more disc manufacturers now than there were 10 years ago. Back in the day, Discraft, Lightning, and Gateway all had to pay patent royalties to Innova just to produce golf discs. The patent expired, and suddenly we have Whamo creating discs again (an ill-fated line). Aerobie created the Epic. Ching broke away from Innova to create their own line of discs. Discwing and Lat64 emerged in Europe. And so on. All in large part because the patent expired.
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