Some yrs back I was working on a project with a new product (to my company). It was a "me too" product that had been in existence for a while, but we developed a more economical process than the existing producer had, and were out to get a substantial part of their business. Our process was more economical because we were basic in some of the raw materials, whereas the other producer had to purchase them from others. The other producer had 2 plants producing this product, one here in the US and one overseas. This was a business for them generating about $50,000,000 revenue, and about half of that was profit margin.
So we patented our process. Of course we were sued by the current producer for patent infringement, and they badmouthed us to the customers to try to scare them away from buying from us.
Turns out there was 1 possible infringement technicality we were guilty of. The other producer had claim that a certain common contaminant was necessary for a decent quality product, so they claimed needing at least some low level (at least 1 ppm) of that to make acceptable product. This was in fact BS, but it allowed them a wide claim against similar processes because it was difficult to disprove, and difficult to eliminate. We in fact had several ppm frequently.
One day the competitors attorneys came to our plant, and I had to show them around and answer their questions. One thing I showed them was an expensive online analyzer showing that we had virtually NO amt of this impurity in our process. Yep, 0.001 ppm. Further, we had historical trends to show it stayed low. So they went away with the foundation of their suit broken.
What they never asked, was if that analyzer was WORKING. It in fact was not. I was under no responsibility to divulge this if not asked. It only worked for a short period before the analyzer probe corroded and failed.
They ended up selling their business and both plants to us for something like $150 million, because they could not compete. We immediately shut down their US facility, and raised our prices. We kept the overseas because it provided poorer quality product to far east markets.
Your patents are only as good as your attorneys.