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3 3 While I do not favor such fees, I think if they were imposed, there should be, a t least, a ten-year period free from any fees. The size of the fee is a matter for discussion, and largely depends, it seems to me, upon the invention in question. It is doubtful if the fees exacted should be the same for all inventions. I t would be desirable to have them so, but this wight work injustice in many cases. Let me reiterate that I think the system as it stands is quite good enough without thesedoi:10.1021/ie50118a010 fatcat:3fexqepsrnc5xmbq33khwxynbq