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I agree that it's the opposite of standard usage but that's how it's interpreted in patent language. Here's a quote straight from the USPTO website:

"The transitional term “comprising”, which is synonymous with “including,” “containing,” or “characterized by,” is inclusive or open-ended and does not exclude additional, unrecited elements or method steps." http://www.uspto.gov/web/offices/pac/mpep/s2111.html

There are other non-standard interpretations in patent language. For example, "a" or "an" is not necessarily a singular but can mean "one or more". Also the inventor is free to provide their own definitions for words they use in the patent specification.




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