In its opinion the Court discusses earlier wire fence construction that, though somewhat similar to Glidden’s, did not “anticipate” the Glidden invention. “Anticipate” is a term of art in patent law. In order for a device in the prior art to anticipate, and so defeat novelty, the prior art reference needs to contain each and every element of the invention claimed by the patent applicant. The degree of similarity required must be essentially complete. If an applicant for a patent is claiming “a device consisting of parts A, B and C ” and the prior art contains two devices, one consisting of an A and a B, and another consisting of parts A, C, and D, neither of the prior art references anticipates the claimed device, and it is not permissible to combine them.
Above is a quote from my textbook. I am confused about the parts in bold and am not sure what it is trying to say. I think it is trying to say that the patent for "a device consisting of parts A,B and C" is novel and therefore ok because it was not anticipated by a previous patent. And the reason why it wasn't anticipated in the previous patent is because.........
And that is where I get lost. Is it saying that the previous patent must have a diagram of a single device containing ALL the same elements as the new patent does in order to anticipate it?
bonus question: What if the previous patent had a diagram for a device with components "A,B,C, and D"? I take it that the inclusion of D does not prevent anticipation. Right?