It is not clear from the statement of your question whether you are selling an iPhone back cover housing that you make and sell on your own or whether you are reselling someone else's back cover. The infringement analysis is essentially the same for both cases, but you may have contractual indemnification or other remedies in the case of infringement if it is "someone else's" back cover. Additionally, it is not clear what you mean by "an iPhone back cover housing". If it is a replacement back cover housing which physically replaces the one with the Apple logo, you will likely have significant infringement issues and you will want to consult an intellectual property attorney before proceeding, if at all. For example, if you are replacing the back cover of an Apple iPhone with a new back cover housing bearing a "pear logo", the consuming public will likely be confused as to whether such a "rebranded iPhone" is a genuine iPhone or some competing look-alike Pear phone. If there is a likelihood of confusion, there is infringement. In that case, you could be relatively certain that Apple's attorneys would file a trademark infringement lawsuit to prevent you from selling your housings. Apple may also have patent rights in the back cover housing to its iPhone, so your replacement may infringe those patent rights as well. If instead your housing is just a protective cover for the iPhone, like those commonly sold by third parties, then the rest of this analysis may apply. So for a complete answer, more information is needed. Assuming your "iPhone back cover housing" is just a protective cover for the iPhone, please read on. With regard to infringement analysis, you are free to sell replacement parts ONLY if: (1) you are not violating any patent covering the part or have a license under the relevant patent(s), and (2) you are not infringing any trademark that may be associated with the replacement part. Regarding the patent analysis, from the facts given it is unclear whether a patent applies or not. You should seek an opinion of a registered patent attorney regarding your freedom to operate or right-to-use the back cover housing you are selling. Regarding the trademark analysis, it would appear from your statement of the question and supporting facts that the back cover housing has either: (1) no logo or trademark whatsoever, or (2) another logo, *i.e.*, a pear logo, but not an Apple logo. Under the first scenario, if there is no logo or trademark, then clearly there can be no trademark infringement. Under the second scenario, you have some other logo or trademark (a pear) that is presumably associated with the owner, manufacturer or source of the back cover housing you are selling on eBay. The question becomes, does that logo or trademark infringe the rights of a prior trademark owner and additionally, is your "pear logo" registrable? The answer to these questions depends on a lot of factors that have not been mentioned in the statement of the question. For example, when did you start using the "pear logo" trademark? When did the senior user start using his mark? Does your use of that "pear" mark for "back cover housings" raise a likelihood of confusion with the senior user's trademark? Are the marks distinctive? And would the senior user be inclined to allow you to use your similar mark and therefore allow the two of you to coexist in the marketplace? Obviously, this is a very fact specific inquiry and there are many other questions your trademark counsel will want to ask you before rendering an opinion whether it is safe for you to use the mark you want to use and whether it might be registrable. As always, you will want to consult with competent intellectual property counsel before proceeding with most any venture where intellectual property rights may be involved....
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