What is the significance of the “A” and “B” series in patent kind codes?
The “A” and “B” series in patent kind codes generally indicate different stages of the patent process. According to MPEP 901.04(a): “A” series: Typically refers to patent application publications or first-level publications. “B” series: Usually indicates granted patents or second-level publications. For example, in the U.S. system: A1 denotes a Patent Application Publication B1 signifies…
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