Yes. The parent post to which I responded said The date of the patent application is the determining date for a patent. when discussing whether or not he could be sued post-issue and that is not true. There are 2 dates, the date a patent is filed (which determines term) and the date a patent was issued (which determines rights). Infringement taking place between the date of filing and the date of issue cannot be retroactively litigated in spite of the fact that it occurred during the term of the patent.

The main issue is that there are 2 dates for a patent, and the post to which I responded gave an answer with no clarity or regard for the disparity and seemed to indicate that the OP could be liable for retroactive infringement which is untrue.

It is just dangerous when people here on HN give advice on patent law issues. They are very complex. This is similar to if you went to a lawyer forum and they all claimed to be experts on web technologies, dishing out bad advice (ASP is totally the way to go these days, that ruby on rails thing I hear is a virus that breaks email printers. Therefore, always use Microsoft servers.), but the consequences here are more dire. If you saw lawyers saying that, you'd probably have a brain aneurism.