The bioassay aspect of the present invention herein may be carried out in a testing subunit or test cartridge designed for use with a bench-top or portable testing system and device such as that disclosed in U.S. Patent No. 9,023,640, which is incorporated by reference herein, in its entirety.
What does "that" refer to in the paragraph above? The device? The system and device as a single unit?
A 'system and device' similar in function and use 'as disclosed in U.S...'
The use of "that" here is essentially the sense defined in 4a of https://www.merriam-webster.com/dictionary/that:
4a: the one : the thing : the kind : SOMETHING, ANYTHING
// the truth of that which is true
// the senses are that whereby we experience the world
// what's that you say
That is, it means basically "...such as the one disclosed..."
Note that this use is not very common, and usually comes up mostly in set phrases or, as in this case, in some legal or technical contexts (patent filings tend to have a lot of unusual English constructs which even native speakers can sometimes have a hard time with, due to a complicated history of legal language, etc).
