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The likelihood of confusion standard is applied to measure the infringement of trademark rights and the registrability of marks. The "related goods" test being a facet of the ultimate and final test of likelihood of confusion, is applied by the Trademark Office under Lanham Act §2( d) in passing upon the registration of marks. With the abolition of the restrictive "same descriptive properties" test of the 1905 Act, the 1946 Lanham Act gave rise to the modem "related goods" rule under which the owner of a registered mark has protection against use of his mark on any product or service which would reasonable be thought by the buying public to come from the same source, or thought to be affiliated with, connected with, or sponsored by, the owner of the registration. To determine whether goods are so related that confusion is likely, one must canvass a number of factors, no one of which is determinative per se. Among these factors are the strength of the mark, the degree of similarity of the marks, the degree of closeness of the products, the likelihood that the senior user would expand, actual confusion, the defendant's motive and good faith, the quality of defendant's product, the sophistication of the buyer class, channels of trade and price ranges.