> Why did they lobby against pollution reduction
For the same reasons I mentioned previously. Arbitrary fees and regulations can stifle the natural advancement. The patent in this case shows that they were working on reducing CO2 emissions which would benefit them in the long run as ICE engines would be cleaner. As such, they would be better competition to future electric competitors. Hence, more oil being purchased for their bottom line.
If they spend money and time lobbying and paying fees, that is money that is not spent on productive activities. Furthermore, it costs consumers more to purchase their product. This cost to consumers restricts their ability to invest in themselves and their future. Little Johnny wants to go to school to study clean nuclear fusion? Too bad, Ma & Pa have been paying more for goods and services for 18 years. Little Johnny will have to flip burgers instead.