Well it's entirely possible that if overly broad patents had killed the initial market for steam engines the industrial revolution could have been delayed far longer than 20 years, or perhaps not have even happened at all.
For instance, the Romans had toys that used steam, but the technology never made the leap to a productive use in the form of steam engines. One theory is that the vast use of slave labor in Rome meant that there was no economic impetus for the discovery of labor saving technologies. By the time the market was right for labor saving technology the basic technology used in the toy had largely been forgotten.
Another example is metallurgy in pre-Columbian America. To our knowledge, the Native Americans in North America never developed the technology to melt, smelt, cast or alloy metals. This was despite the fact that bronze alloys had been in use in the old world for over 6000 years by the time Columbus landed on the New World, and iron smelting had been in use for nearly 2500 years.
Innovation and invention do not exist in a vacuum. They are closely tied to the time and place where they occurred. So, yes, it would be entirely possible that electricity never would have existed if patent law was different 200+ years ago.