On the other hand, suppose that Company A describes the invention in detail (or in more formal terms, provides a disclosure) at a trade show, before a disclosure or a filing by the second company. In this case, Company A can get the patent even though it filed after Company B.
So my understanding they can put some information (but not their whole invention) and get recognized for the patent.
So my understanding they can put some information (but not their whole invention) and get recognized for the patent.